Preparatory Workings Research Articles

ЗІСТАВЛЕННЯ ДЕФОРМАЦІЙНИХ ВЛАСТИВОСТЕЙ ОХОРОННИХ СПОРУД ПІДГОТОВЧИХ ГІРНИЧИХ ВИРОБОК

Purpose. Investigate and compare the deformation properties of protective structures in the form of coal pillars and structures made of crushed rock for a justified choice of the protection method, which can make it possible to ensure the stability of side rocks in the coal massif and preparatory works in the mining areas in the coal mine. Methodology. To achieve the goal, laboratory studies were performed on experimental samples subjected to uniaxial compression. For pillars, their thickness was changed, whereas for structures made of crushed rock the thickness of the rock layer was changed at a constant cross-sectional area. Results. As a result of the conducted research, the deformation properties of protective structures that were subjected to uniaxial compression have been determined. A 15% reduction in their stiffness was recorded for pillars, when their thickness h0 was two times changed, and for the external static load, which varied according to a linear dependence. Within the limits of the safe deformation resource, when the relative deformation is in the range of values 0.18≤λ≤0.23, the stability of the pillars and their bearing capacity is ensured. At the same time, the relative change in their volume should not exceed 7-9%. It has been established that exceeding the limit level of the specific potential energy of deformation by an average of 12-14% causes the destruction of coal pillars. For protective structures made of crushed rock with a relative volume change of 0.35≤δV≤0.28, the value of the compaction coefficient of the original material decreases from kcons = 1.5 to kcons = 1.42 with a simultaneous increase in the work of compression and an increase of more than 20% in the specific potential energy of deformation, thanks to which the rigidity of the embedded material and the bearing capacity of protective structures made of crushed rock are ensured. Scientific novelty. The regularities of formation of deformation properties of protective structures under conditions of uniaxial compression, taking into account the change in the specific potential energy of deformation and the relative change in their volume, have been established. Practical significance. In order to ensure the stability of side rocks in the coal massif and preparatory workings at excavation sites in the coal mine, the feasibility of using partial or complete paving of the produced space from crushed rock, which limits the movement of side rocks in the produced space, has been substantiated.

ВДОСКОНАЛЕННЯ СПОСОБІВ ЗБЕРЕЖЕННЯ СТІЙКОСТІ ПІДГОТОВЧИХ ВИРОБОК З УРАХУВАННЯМ ДЕФОРМАЦІЙНИХ ВЛАСТИВОСТЕЙ ОХОРОННИХ СПОРУД

Purpose. To evaluate the deformation properties of protective constructions of preparatory workings to maintain their stability in the excavation areas of coal mines with steep coal seams. Methodology. To achieve this goal, laboratory and field studies of the deformation properties of protective constructions have been performed. Results. It has been established that under uniaxial compression, under the action of a statistical external force, which manifests itself in the conditions of uniaxial compression and relative deformation of wood chocks within 0.1<λ<0.2, their stiffness decreases, and then it increases at 0.4<λ<0.7, which creates conditions for ensuring the bearing capacity of protective constructions. Under field conditions, when using the method of protecting the slope drifts with wood chocks made of sleepers, after their deformation of more than 40% in the zone of influence of mining works (0<l<100 m), a gradual decrease in the increase in the displacement of side rocks on the contour occurs during the compaction process, due to which the operational condition of the preparatory workings along the length of the excavation section is ensured. To study the deformation characteristics of the protective constructions, we used the function of the incremental displacement of the side rocks on the contour of the workings at the section of 0<l<100 m behind the face. Scientific novelty. The regularities of deformation of protective constructions of preparatory mine workings under uniaxial compression with regard to changes in their stiffness have been established. Practical significance. When mining steep coal seams, using the peculiarities of geomechanical phenomena manifested in the coal massif, it is advisable to use compressible protective constructions of preparatory mine workings.

ИССЛЕДОВАНИЕ ДАВЛЕНИЯ ГАЗА В ПРИЗАБОЙНОЙ ЧАСТИ УГОЛЬНОГО ПЛАСТА С ПРИМЕНЕНИЕМ ИННОВАЦИОННОГО МЕТОДА

The presented work is aimed at solving issues related to ensuring the safety of mining operations in the preparatory workings of mines from the point of view of the forecast of gas dynamic phenomena. The results of a study of gas dynamic activity in the bottom-hole part of a coal seam using an innovative device that allows you to evaluate changes in the gas content of the formation along the line from the bottom to the geostatic stress zone during preparatory workings are presented. It is proposed to develop a method for the current forecast of the emission hazard based on the assessment of methane production and a new approach to assessing the gas dynamic hazard of the formation, which will increase the rate of movement and ensure the safety of mining operations.

МОДЕЛИРОВАНИЕ АДСОРБЦИОННОЙ СПОСОБНОСТИ ГЛИН НА СТА ДИЯХ ЛИТОГЕНЕЗА

Clays are one of the most important minerals, they are widely used in industry. The development of mineral deposits by open or underground methods is carried out mainly at depths of up to 10 - 1000 m. Clay rocks (layers, layers and interlayers) of different genesis, located in the array of preparatory and mining workings (roof, soil and sides) or in the sides of quarries, have a significant impact on the stability of mine workings. Especially great influence on the safety of mining operations is exerted by clays subjected to technogenic impact, primarily by aqueous solutions and water vapor during open and underground mining of mineral deposits. During the development of mineral deposits, the clays that make up the exposed massifs have a very great influence on the stability of mine workings. The strength characteristics of clay rocks are largely determined by the degree of their water saturation. To develop technologies for increasing the strength properties of clay interlayers, it is necessary to study the effect of the composition and structure of clays formed at different stages of lithogenesis, as well as their adsorption (water absorption) capacity.

Development of a system for ranking geomechanical factors, which influence the stability of uranium mines workings

The subject of research presented in the article are processes that take into account the influence of geomechanical factors on the stability of mining workings of uranium mines. The purpose of this work is development of a system for ranking geomechanical factors by the degree of danger based on the analysis of risk factors that affect the stability of uranium mines. The work uses critical analysis and generalization of both own research results and the results of domestic and foreign authors. The geomechanical factors that affect the stability of the mining workings of uranium mines have been determined. It is shown that their influence has both a direct and an indirect effects due to the connection with mining-geological and technological parameters. The stability of the workings is significantly influenced by mining and technical factors (outcropping time, working space length, floor height, compression properties and structure of the backfill mass, chamber width, dynamics of cleaning works progress), mining and geological factors (depth of mining, thickness of the ore body, strength (deformation)) and physical and mechanical properties of the rock mass. In addition, the engineering and technical conditions of mine construction have a significant impact, in particular, the form and size of the workings, their orientation in the massif, the method of carrying out and supporting, the design and technology of fastening, etc. It is practically impossible to simultaneously take into account all factors in an analytical way, so it is necessary to select one or two main factors that are of decisive importance for the description of a specific geomechanical process. The originality of the work is the proposed ranking of geomechanical factors that affect the stability of mining workings of uranium mines. The ranking of geological, physical and mechanical factors on the stability of the chamber system elements at underground mining of uranium ores, according to the degree of attenuation of the influence, is as follows: strength of rocks → structure of the massif → angle of fall of the deposit → water content of the deposit → thickness of a seam. The ranking of the influence of support preparatory and capital workings on their stability, according to the degree of risk decrease, is as follows: no support → grid with anchors → sprayed concrete → wooden support → metal frame support with tightening → metal arches in concrete. Generalized ranking of the influence of the most significant factors on the stability of mining workings: geological, physical and mechanical factors → parameters of the development system → fastening technologies.

ОБҐРУНТУВАННЯ ЗАХОДІВ ЩОДО БЕЗПЕЧНОЇ РОЗРОБКИ КРУТИХ ВУГІЛЬНИХ ПЛАСТІВ

Purpose. Justification of measures regarding the safe development of steep coal seams to ensure the safe efficiency of coal mining and increase the safety of miners in deep coal mines. Methodology. In order to achieve the goal, laboratory studies of the deformation properties of protective constructions were carried out on the models subjected to uniaxial compression, and field studies of the stability of preparatory mining products with various methods of protection. Results. It was found that for coal cinders within the limits of the established deformation resource (0,10,25)) at the same time as their stiffness increases, the potential energy of deformation reaches a critical level, on which the short-term stability of protective constructions is realized. At the same time, there is a relative change in volume in the range of 0,05V0,1. With the increase in static use and the transition of the critical level of deformations, when 0,25 і V0,1, the loss of cylinder stability remains. For protective constructions made of crushed rock when they are uniaxially compressed, the change in the behavior of the deformed body is separated from the compaction of the primary material. Within the limits of the deformation resource (0,40,7), a relative change in the volume of crushed rock of 0,2V0,35 has been recorded. According to the number of sizes of such protective constructions, when the work of compression increases, the value of V decreases. At the same time, the bearing capacity of protective constructions increases. Scientific novelty. The deformation resource of protective constructions of preparatory mine workings determines the effectiveness of the protection method used. Within the limits of the deformation resource, a stable state of protective constructions is ensured, which operates under conditions of single-height compression until the critical level of the specific potential energy of deformations is reached. Practical significance. To ensure the stability of the pits in the coal-bearing massif and the operational condition of the prepared products in the mining areas, it is advisable to use partial or full laying of crushed rock or wooden chock with sleepers in the mined space.

ASSESSMENT OF THE STABILITY OF MINE HAULAGE DRIFT USING STATISTICAL ANALYSIS OF ARCH YIELDING SUPPORT FAILURE

Purpose. The stability of mine haulage drift has been evaluated using statistical analysis of arch yielding support failure under different protective measures to create safe working conditions for miners in deep coal mines with steeply dipping seams. Methods. A comprehensive approach was used, including a mine experiment , probability theory methods, and statistical analysis of experimental data. Results. The stability of mine haulage drift on steep seams was assessed in natural conditions under different protective measures. It was found that while using post-and-lintel support to protect the drift, with an arch yielding support failure frequency of w≥0.56 and normal distribution of single-factor dispersion analysis statistics, the loss of cross-sectional area of the excavation over the length of the mining site was about 50%. While using cribbing support for protection, with an arch yielding support failure frequency of w≥0.29, the loss of cross-sectional area was 30%. Empirical frequency w of the arch yielding support failure along the length of the excavation does not differ from theoretical frequencies, allowing the probability of an event related to deterioration of the stability of the mine haulage drift along the length of the mining site to be determined within a confidence interval under different protective measures. Novelty. A functional dependence was established to evaluate the stability of the mine haulage drift under different protective measures along the length of the mining site using single-factor dispersion analysis statistics of arch yielding support failure. Practical significance. Based on the statistical analysis of arch yielding support failure installed in the mine haulage drift, it is advisable to consider that the operational condition of the preparatory workings is ensured when using protective structures in the form of wooden cribbing support.

ИССЛЕДОВАНИЕ НАПРЯЖЕННО-ДЕФОРМИРОВАННОГО СОСТОЯНИЯ ПОЛЕВЫХ ВЫРАБОТОК ПРИ ОТРАБОТКЕ КРУТОПАДАЮЩИХ ЖИЛ С ЦЕЛЬЮ ПРОГНОЗА ИХ УСТОЙЧИВОСТИ

The paper presents the results of the study of the stress-strain state of field workings located in the zone of influence of stoping operations during the excavation of low- and medium-capacity steeply declining gold veins. Laws of stress distribution on the contour of field workings depending on the distance from the mined-out space were determined. On the basis of the determined regularities the methods for assessing the degree of stability of field preparatory workings and permanent mine workings, undermined by the mined-out space, were proposed.

Some results of the study of rock properties of the Sulukta deposit

This article presents the results of research into the properties of physical and mechanical properties of rocks and their influence on the conditions of their occurrence in the coal-bearing massif, depending on the geological structure of a particular section of the rock massif and the relief of the area, to develop an experimental method of inspection of preparatory workings and the development of safety pillars. As a result of the research carried out, it was revealed that geological structures, tectonic stress fields, physical and mechanical properties of rocks and the relief of the earth surface of the deposit regularly reflect the values of shear angles, safe depth of development. These regularities can be used to forecast and estimate the boundary of the zone of dangerous influence of underground mining and the duration of the shear process. The physical and mechanical properties of rocks, determined by the depth of occurrence of rocks, tectonics and fracturing, humidity, relief of the surface of the deposit. The results of the research will allow to estimate the safe depth of underground workings, the nature and duration of rock shear processes, to reveal the zones of dangerous influence of underground workings, and will increase the efficiency of the method developed by the authors for inspection of preparatory excavations and mining of safety pillars in the conditions of the Sulukta lignite deposit. New values of physical-mechanical properties and dependences for rocks of Sulukta lignite deposit were obtained, which are valuable for designing and planning of safety pillars mining.

EXPERIMENTAL STUDIES OF THE STABILITY OF HAULAGE DRIFTS ON PITCHING SEAMS WITH DIFFERENT METHODS OF PROTECTION

Purpose: Study of the stability of haulage drifts on pitching seams with different protection methods in order to assess their operational condition and create safe working conditions at excavation sites in deep coal mines. Methodology: The research used a comprehensive approach, including research analysis of the problem under study, field experiment and data processing. Conclusions: As a result of the conducted research, it was established that when protecting the haulage drifts on pitching seams of solids of coal, in the area of influence of cleaning works, the cross-sectional area of the preparatory work decreases by 50 % or more, and the deformation of protective structures after losing their stability reaches the maximum value λ = 0.8. At the same time, the fastening in the product is deformed, and the side rocks collapse. The industrial situation provokes injuries from collapses. When protecting the roll-back stretch with wooden piles, after their compression (when the relative deformation reaches the maximum values of λ = 0.6), the loss of the cross-sectional area is about 30 %, and the bearing capacity of the protective structures allows you to limit the movement of side rocks and prevent their collapse. Implications of research: In order to create safe working conditions for miners in preparatory workings in mines with steep coal beds, it is recommended to use flexible protective structures that limit the movement of side rocks in the mined space. Originality: A functional dependence in the form of a time series was established, which takes into account the change in the relative deformation of protective structures during the operation of the production at the excavation site.

Methodology of observations during work in conditions of deformation of arch support to improve the safety of workers

Safety of works is always a priority. In the conditions of mining operations at present in difficult mining and geological conditions, when the depth of development increases, this issue is not easy to solve. Protective structures and supports, which guard the safety of mining operations, should be under close control. This will reduce the amount of repair work and warn workers about the danger in advance. On the basis of full-scale mine observations of the deformation of the arch support of the preparatory workings located in the area of cleaning works, using the method of linear interpolation of the obtained data, a method of full-scale observations was proposed. To solve this problem, field studies were carried out in the conditions of the Yubileynaya mine of the Pavlogradugol State Enterprise. The obtained data were processed, deformation graphs, graphs of changes in the parameters of the workings over time were built, the necessary analysis of the data obtained was performed and the methodology of mine observations was developed. The scientific novelty consists in providing a new representation of the dependence of the bearing pressure on the rate of deformation processes, which affects the change in the cross-section of the workings, the change in the initial data of the dimensions of the height and width of the workings. Practical significance lies in obtaining the results of the impact of cleaning works on the change of the working cross-section of the workings. The change in the deformation rate of the values of the height of the workings indirectly characterizes the bearing pressure zones. The obtained parameters of the deformation results can be used in the numerical modeling of the deformation of the side rocks, and in the further prediction of dangerous conditions caused by the manifestations of the bearing pressure in the zone of influence of the cleaning works

Substantiating rational parameters for a stull-timbered device of the selective heading machine

Purpose. To carry out the studies of proposed options for overlapping to support excavation roof and ensure roof maintenance to avoid collapse and protect people and mechanisms. To study a specified goal, an expert assessment of the existing tools to maintain roof rocks in the working area where people and mechanisms are engaged has been carried out. Methodology consists in applying software and computer simulation of interaction processes of mining rocks with arched design options. Findings. A short analysis of the most commonly applied structures to provide temporary fastening of preparatory and permanent mine workings has been carried out. The options for a roof design and the elements for temporary fastening are proposed. The parameters for four sectional overlapping have been substantiated. The loads acting on the roof-supporting structure and the coefficients required to determine the rock loads, the strength of some roof layers and "soil" as well as the forces in the rack hydraulic cylinder have been calculated. Originality. Applying temporary arched fastening in the working area of a tunneling machine promotes reducing a number of technological operations and manual labor employment as well as enhancing maintenance personnel safety. The speed of tunneling works is supposed to increase. Practical value. It is based on the analysis of a selective heading machine performance with an easily collapsed roof, study results to achieve a constructive machine improvement are presented. Its components may vary depending on mining and geological conditions of the work. The obtained parameters are verified by calculations and design solutions. The minimum mass of the fastening that provides both rigidity and strength of the structure is significantly reduced. Obtained results can be applied in underground tunneling and other similar works as well as in constructing roads and railways. The design of the device gives the possibility to adjust the height depending on the mine roof condition.

Anchor bolt of rock massif in coal mines to decrease soil rock heaving of the workings

During the maintenance of workings, the effects of soil rock heaving, caused by plastic deformation and extrusion into the excavation cavity under the action of the rock pressure, are usually eliminated. The identified patterns of change in the stress-strain state of coal-rock massifs (displacements, stresses, cracking zones), depending on the main mining-geological and mining-technical factors will allow to establish the optimal parameters of soil anchoring, technological schemes for decreasing soil rock heaving of mine workings to increase the stability of preparatory mine workings have been developed. The development and improvement of existing technologies of effective and safe stiffening of near-soil rocks at conducting mine workings on flat and inclined coal seams were substantiated. The modelling of the SSS shows that both side-rock and ground deformations are predominantly influenced by side anchorage which results in reduction of the effective deformations in the rocks surrounding the working and in a decrease of gas release from the coal massif. It is established that the deformations and stresses both side and in-soil rocks in the excavation are influenced by side anchors rather than near-soil ones.

Substantiating arched support made of composite materials (carbon fiber-reinforced plastic) for mine workings in coal mines

This paper studies a new composite materials based on carbon fiber-reinforced plastic, which is planned to be used for supporting the preparatory workings when mining the coal at depths of more than 1000 meters. The composite material made of carbon fiber-reinforced plastic has sufficient lt high physical-mechanical properties, which are even higher than that of low-alloy steel used as the main material for supporting in coal mines. The purpose of the research is to substantiate the model of support (arched three-link) and determine its rational parameters. The calculation of the stress-strain state around mine working, using the support made of composite materials, has been perfomed based on the method of finished elements in the Solid Works software product. In addition, a model of the support for coal mines has been developed on a 3D-printer. This made it possible to conduct additional research on the interaction of the support with the rock mass. Using the Solid Works software, a detailed modeling of the composite supporting system has become possible. The stress-strain state of the rock mass has revealed that support can be used to improve the strength characteristics and prevent uneven pressure distribution around mine workings. A support made of composite materials contributes to the introduction of resource-saving technologies in the mining industry.

Choice of the Arch Yielding Support for the Preparatory Roadway Located near the Fault

The article presents a method of selecting an arch yielding support for preparatory workings driven in a hard coal seam. Particular attention was paid to discontinuous deformation in the form of a fault, which significantly contributes to the change of the excavation protection schemes. On the basis of the geometry of the machines and devices in the designed excavation, the support was selected, which was then checked for the ventilation criterion. In the next stage, analytical calculations were carried out using the determined spacing of the steel support in the fault zone and the area outside of it. Additionally, using the RS3 numerical software based on the finite element method, a rock mass model with a fault was built, through which the preparatory excavation passes. The aim of the research was to determine the total displacements occurring in the fault crossing zone for the excavation without support and with the use of steel arch yielding and with additional reinforcement in the form of straight segments. In conclusion, it was found that the variants of the excavation reinforcement can be modeled and selected in advance, which allows for the fastest possible execution of the driving and the maintenance of the minimum movement dimensions while passing through the fault.

Computer-aided design of rational parameters for the location of blasthole charges in horizontal underground development

ABSTRACT The article substantiates a stage-by-stage physical model of destruction of a real rock mass. On its basis, the key results of an explosion in a solid medium were determined: the strength characteristic of rocks under conditions of all-round explosive loading, the relative limiting radius of the blast cavity, the radii of the zones of fine crushing and radial cracks, and the principle of the rational arrangement of charges in the blasted block was formulated. Using this principle, an analytical method has been developed for determining the rational parameters of the location of charges in the face of preparatory workings and their computer-aided design. Experimental explosions carried out in the underground mines of Kazakhmys Corporation LLP confirmed the operability of the proposed automated design of drilling and blasting operations in horizontal underground workings. The proposed results are in good agreement with the data presented in the works of a number of world authors.

Investigation of the bearing capacity of rocks at the interface of preparatory and treatment workings

Investigation of the bearing capacity of rocks at the interface of preparatory and treatment workings

ДОСЛІДЖЕННЯ ДЕФОРМАЦІЙНИХ ХАРАКТЕРИСТИК ОХОРОННИХ СПОРУД ПІДГОТОВЧИХ ВИРОБОК ДЛЯ ПРОГНОЗУВАННЯ СТІЙКОСТІ БІЧНИХ ПОРІД У ВУГЛЕПОРОДНОМУ МАСИВІ

Purpose. To study deformation characteristics of embedded massifs from crushed rock under different compression conditions to ensure the stability of side rocks in the coal massif. Methodology. To achieve the goal, the laboratory studies of deformation characteristics of embedded massifs during compression of crushed rock and during its uniaxial compression, with the possibility of lateral expansion of the source material, have been performed. Results. As a result of the performed experimental studies, the characteristic features of the deformation of embedded massifs made of crushed rock have been revealed. It has been established that the deposit array ambiguously determines the ability to respond to the influence of external factors, which are manifested when the coal array is unloaded with the workings. Such ambiguity is due to different compression conditions. The effect of laying the produced space as a method of protection of workings is ensured in conditions where the compression modulus of crushed rock, as a system of fractions of the embedded massif, is in the range of values △p ≥ (350...600) mm/m. In this case, the characteristics of the rigidity of the embedded massifs allow limiting the convergence of the side rocks in the produced space of the excavation site. Scientific novelty. Under conditions of compressive compression or uniaxial compression, with the possibility of lateral expansion of the crushed rock, when the rigidity of embedded massifs increases, when comparing the relative deformation of protective structures at different stages of deformation, the discrepancy between the values of this magnitude changes as a function of hyperbolic cotangent. Practical significance. It is necessary to take into account the deformation properties of the laying massifs in conditions of lateral expansion of crushed rock when applying the laying of the produced space as a method of protecting the preparatory workings in the excavation areas of coal mines.

Дослідження деформаційних характеристик ціликів вугілля як охоронних споруд підготовчих виробок

Purpose. Investigate the deformation characteristics of over-track coal aggregates as a way of protecting the preparatory workings and evaluate their impact on the stability of side rocks in the coal massif to ensure safe working conditions for miners in the mining areas. Method. To achieve the goal, laboratory studies of the deformation characteristics of protective structures in the form of whole coal were performed on models of equivalent materials. The models, with the ratio of sample length to width a/b=(1-2), were subjected to uniaxial compression. Results. It has been proven that the potential energy of coal aggregates is a function of their state, which takes into account the change in volume and shape under the action of an external load. It was experimentally established that under conditions of uniaxial compression in the range of changes in the relative deformation of coal aggregates 0.1≤λ≤0.25 depending on the size of the structures used, with an increase in the cross-sectional area of protective structures, the growth of the load continues without loss of their bearing capacity. Within the limits of the established safe deformation resource, the potential energy of overstretched coal units reaches a critical level, at which the stable state of the deformable structures is realised for a short time. At the transition of the critical level of the safe deformation resource, when λ>0.25, there is a loss of stability of the wholes, intensification of the convergence of the side rocks and their breaking, with subsequent collapse. Overstretched cells, within the limits of a safe deformation resource, are able to concentrate the potential energy of compression. The main element in the mechanism of destruction of over-stretched coal units is the critical density of elastic energy, the amount of which depends on their size. Scientific novelty. It was experimentally established that under the conditions of uniaxial compression of superstriped coal units with the ratio of their length to width a/b=(1-2) until the moment they lose stability, between the magnitude of the relative deformation and the change in the cross-sectional area of the used protective structures in contact with the side rocks in the produced space of the coal massif, there is a logarithmic functional dependence that allows determining their safe deformation resource. Practical significance. Coal targets, as protective structures of limited sizes, also have a limited safe deformation resource, which depends on the size of the structure and restrains the use of this method of protection of rollback stretches in the development of steep formations.

New technical solutions in the field of protection and fastening of mine workings

The article discusses the features of fastening preparatory workings in difficult geological conditions, which are studied in three directions: improving concrete, arch and anchor fasteners with the consideration of the initial physical and mechanical properties of the rock mass; introduction of steel-polymer anchor; improvement of cast strips designs in combination with arch and anchor fasteners for reuse. Protection methods of mine workings and means of fastening often do not correspond to the peculiarities of the manifestation of rock pressure at the end sections of lavas and in zones of tectonic disturbances, as a result of which can become the main cause of the unsatisfactory state of the mine workings. Mathematical modeling of the rock massif stress-strain state has been carried out by the finite element method. Rigid and pliable cast strips, various technologies for erecting a cast strip, as well as a combination of cast strips with anchor and arch fasteners are modeled. The locations and sizes of rocks destruction zones, stresses in the rock mass for different options of fastening have been determined. The drawbacks of the existing technologies for the construction of cast strips are revealed and the factors for increasing their technical efficiency are established.