Coal Mine Construction Research Articles

Research on Risk Control of Follow-up Auditing in the Whole Process of Coal Mine Construction Project

Research on Risk Control of Follow-up Auditing in the Whole Process of Coal Mine Construction Project

The view of technological innovation in coal industry under the vision of carbon neutralization

This paper analyzed the current situation and development trends of energy consumption and carbon emissions, and the current situation and development trend of coal consumption in China. In the context of recently established carbon peak and carbon neutralization targets, this paper put forward the main problems associated with the green and low-carbon development and utilization of coal. Five key technological innovation directions in mining were proposed, including green coal development, intelligent and efficient mining, low-carbon utilization and conversion of coal, energy conservation and emission reduction, carbon capture, utilization and storage (CCUS). Focusing on the above technological innovation directions, it is suggested to carry out three basic theories, including the theory of green efficient intelligent mining, clean and low-carbon utilization and transformation of coal, and CCUS. Meanwhile, it is proposed to develop 12 key technologies, including green coal mining and ecological environment protection, efficient coal mining and intelligent mine construction, key technologies and equipment for efficient coal processing, underground coal gasification and mining, ultra-high parameter and ultra-supercritical power generation technology, intelligent and flexible coal-fired power generation technology, new power cycle coal-fired power generation technology, the development of coal-based special fuels, coal-based bulk and specialty chemicals, energy conservation and consumption reduction, large-scale and low-cost carbon capture, CO2 utilization and storage. Finally, necessary measures from the governmental perspective were also proposed.

Research on Excavation and Stability of Deep High Stress Chamber Group: A Case Study of Anju Coal Mine

As the underground transportation hub and power center, the stability of chamber group is one of the key points of coal mine construction. With the increasing of mining depth, it is more and more difficult to control the stability of roadway and chamber in coal mine, especially in the mining process. Because the excavation of chamber group is a dynamic and multi factor coupling process of, it is necessary to adopt dynamic construction mechanics to optimize the excavation scheme. Therefore, based on the engineering background of − 1155 m level at Anju coal mine in Shandong, the numerical model of deep high stress chamber group is established. Then the interaction of adjacent roadways in the process of excavation and the stress superposition of chamber intersection are studied. The excavation process of the chamber group is divided into three phases, and the construction optimization scheme is formulated. Through numerical simulation, the stress and plastic zone of each excavation scheme are analyzed, and the optimal construction sequence of each phase is determined. Finally, through the field implementation and engineering application, the optimal excavation scheme of tunnel group design is proved. The results provide a scientific basis for the excavation of deep high stress caverns and the improvement of surrounding rock support. At the same time, it also has a good reference significance for other similar underground engineering.

Application of Remote Sensing Technology in Land Use Survey of Mining Area

Land Use and Cover Change (LUCC) survey is an important content to understand and study regional ecological environment change. The production and construction of coal mine will have an impact on the local ecological environment. The application of remote sensing technology to select high-resolution images, man-machine interactive interpretation method combined with field investigation verification was used to carry out LUCC in the study area. The current situation investigation can quickly and accurately grasp the land use types and distribution characteristics of the study area, and provide a reference for the rational land development and ecological environment protection in the process of coal mine production and construction in the future.

Experimental Analysis on Creep Properties of Frozen Silty Mudstone Considering Conservation of Energy

Abstract The artificial ground freezing method is a dominant technique during the construction of massive coal mines and tunnels. The comprehensive understanding of creep properties, especially the accelerating creep process of frozen soft rock, can provide significant guidance regarding the excavation of the soft rock layer. In this article, a series of uniaxial compression tests and creep tests of silty mudstone samples was conducted. In conjunction with the experimental data, the creep properties of frozen silty mudstone at transient, steady, and accelerating creep stages are discussed in detail. Furthermore, based on the conservation of energy, a winding element is introduced to modify the classical Nishihara model, which reveals that the modified Nishihara model not only presents the creep-damage properties of frozen silty mudstone at the accelerating creep stage but also describes the primary and stationary creep stages accurately. Moreover, the fitted results using the modified Nishihara model are in good agreement with the test results. Ultimately, the results of sensitivity analyses corroborate that small changes in the stress level can cause large changes in the failure time. At the accelerating creep stage, the axial strain rate increases more rapidly when the coefficient winding element is small, causing a shorter time to approach failure. This modified creep model can present a theoretical basis for further revealing the objective law of rock creep and can provide an important reference for the safety assessment of coal mine and tunnel construction using the artificial ground freezing method.

Coordinating urban construction and coal resource mining based on equilibrium value between coal reserve and land resource in coal cities

With the acceleration of urbanization and industrialization, coal cities in China are suffering from the conflicts between urban construction and coal mining (land- mining). Land-mining conflicts in coal cities have caused serious destruction of land resources and the aggravation of ecological and economic conflicts. In order to deal with the land-mining conflict, we proposed a new three-dimensional spatial analysis framework to overall plan the underground coal exploitation and aboveground land use based on economic comparative advantage and value equilibrium theory. First, estimating aboveground land resource value (LP) and underground coal resource value (MP), then comparing MP and LP by equilibrium analysis method to recognize three-dimensional development boundary. Last three boundaries derived were used to divide the study area into four parts (construction/mining-forbidden area, construction put-off/mining-limited area, construction limited/mining-put-off area and construction forbidden/mining area). Ji’ning, a typical Chinese land-mining conflict city, is taken as a case to verify the effectiveness of the new method. The results show that the amount of coal mining and urban construction area increased by about 2 times, the new method can resolve land-mining conflicts in coal cities. It can contribute to a better reference for the design of coal city regulation and control policies design.

Analysis of Roadway Rock Bolting in Coal Mine Construction

Analysis of Roadway Rock Bolting in Coal Mine Construction

Recent Patents on Conical Pick and Flat Pick for Coal Mining

Background: Coal mining machines are the primary equipment used for the comprehensive mining of medium and thick coal seams. A shield machine is used to modify the geological structure of the soil, especially in urban subway tunnel engineering. The cutting and tunneling equipment have greatly improved the efficiency of coal seam mining and rock tunneling construction, but the consumption of picks in mining and tunneling is very high. Objective: In order to reduce the consumption of picks, it is necessary to obtain the change of temperature inside the pick in the process of cutting. Methods: This paper introduces a temperature measurement method to measure the temperature inside the conical and flat pick to provide a reference for the design and manufacture of picks. Results: The temperature measurement method used in flat and conical pick can obtain the temperature change inside the pick under the actual working condition, which has a considerable guiding significance to promote the development of coal mining. Conclusion: This study provides an important basis for the safety of mining operations and for prolonging the service life of picks. It has a strong innovation value and broad practicality.

Prediction of Surface Subsidence Due to Mining

Ground subsidence caused by mining is increasing day by day, and some enormous disasters have been brought. Some scholars have carried out some results by a single factor analysis, but did not consider the multi-working conditions, resulting in a certain deviation from the actual project. Accurate and effective prediction of subsidence caused by coal mining is an urgent problem to be solved. In this paper, the main factors affecting surface subsidence in mining area, which are coal seam thickness and mining depth, are studied by means of composite analysis method. At the same time, three-dimensional finite element method is employed to simulate different engineering conditions. According to the simulation maximum value settlements, fitting through MATLAB software, the corresponding predicted models are established. Comparing with the actual engineering survey data, it is proved that the settlement prediction curve is in good agreement with each other. This research has reference value for actual coal mine engineering and construction engineering.

Divestment trends in Japan's international coal businesses

Continued investments in coal-fired power plants (CFPPs) and coal mining are incompatible with the Paris Agreement. As a major investor of both upstream coal mining and downstream CFPP construction, Japanese firms play a large role in sustaining the international coal market. Yet since mid-2018 numerous Japanese companies have announced a range of coal divestment policies. This situation, however, has not been unexamined by scholarship. Additionally, divestment literature outside Japan has focused overwhelmingly on financial institutions rather than the roles of other industry players driving the coal market. To address this gap, this paper examines four industries comprising Japan's international coal market (trading companies, electric utilities, plant equipment manufacturers and financial institutions) to empirically assess the extent of divestment behaviour and identify drivers and barriers. The empirical data reveal a slowdown, but not a cessation, of new and existing coal-related investments. Results also show that the extent of divestment trends can be largely explained by commercial factors, although institutional and structural factors are also at play. These findings have important policy implications.

Study on Comprehensive Evaluation of Mine Construction Project Management Based on AHP-FUZZY

Coal mine construction has investment huge, long cycle, high quality characteristics, higher requirements have been put forward for the mine construction project management. This paper establishes the three-level evaluation index system of mine construction project management from four aspects, which include the project goal, the owner, the supervision unit and the contractor, establishes the project management comprehensive evaluation model based on the AHP method and the FUZZY method, and combined with engineering examples to verify. The results show that the evaluation index system of the index is reasonable. The calculation results of the model is proved that the comprehensive evaluation result is the same as the actual result of the project and has good reliability. The evaluation index system and the evaluation model can provide reference for the evaluation of mine construction project management effect.

Risk probability predictions for coal enterprise infrastructure projects in countries along the Belt and Road Initiative

The Belt and Road Initiative has significantly promoted the construction and development of coal enterprises along the Belt and Road through the building of a new platform that encourages global economic cooperation. This study examines problems caused by the uncertainty of risk occurrence during the process of coal enterprise construction as part of the Belt and Road Initiative. Consequently, the study identifies and classifies various risk factors. In total, 11 types of risks and 39 risk factors involved in the construction process are summarized. These include natural, cultural, religious, marketing, and outsourcing-related risks. A prediction indicator system was also established to apply to the risk occurrence probability related to coal mine construction along the Belt and Road. In this regard, the study embedded an improved artificial fish swarm algorithm (IAFSA) into a cerebellar model articulation controller (CMAC) neural network model and collected risk probability details for the construction of the Barapukuria Coal Mine in Bangladesh from 2013 to 2018 as sample data. By researching the model and sample, this study obtained various risk occurrence probability intervals. Moreover, diversified risk probabilities were verified and predicted. Finally, this study empirically proves that an IAFSA–CMAC parallel coupling algorithm is able to achieve precise predictions about risks. This finding has great significance for risk management and control in the coal enterprises of countries along the Belt and Road.

Water inrush conceptual site models for coal mines of China

Water disasters occur during coal mine construction and production in China and account for many of the nation’s mine disasters and casualties. Although China has made major strides in preventing these major water inrush disasters during the last decades, most coal mines have not developed representative conceptual site models (CSMs) for water inrushes. A CSM describes complete, potentially complete, or incomplete pathways from the sources to various receptors including the mining area and the neighboring ecological environment. While the general components of water inrush CSMs are presented for six different regions of China, the CSM has to be tailored to each specific mine and specific mining area. The pathway analysis solely focused on the CSM approach helps to better understand water inrush mechanisms and perform water inrush risk assessment and identify data gaps for further investigations. It also promotes the integration of water hazard control and ecological environment risk reduction and drives proactive engineering measures for water inrush prevention and mine water control to eliminate or reduce water inrush hazards and ecological deterioration risks.

Coal Mine Safety Profession Talent Demand and Talent Cultivation Analysis

Talent cultivation is not only the first priority of education in the university but also an important prerequisite to provide talents for companies. Coal is the main body of energy consumption in China currently. So the safety production in coal industry is related to peace and prosperity of China. Especially in the difficult times of coal industry, coal mine safety talents are of great significance to the safety production in coal industry. However, it is more important to develop coal mine safety talents and make them into the construction of safety production in coal industry. So from the current general situation of coal industry, the coal mine safety talent demand situation and construction and development of coal mine safety profession, we analyze the talent demand and talent cultivation in coal mine safety profession to explore the existing problems and to give suggestions in this article, which is helpful to construct coal mine safety profession and to ensure the safety production in coal industry.

The Design and Application of Computer Security Management Information System in Coal Mine

With the development of coal technologies, the previous management mode has been unable to meet the requirements of modern coal mine construction, so it is essential to design a new and effective security management information system. The design of this system is based on B / S structure, which main function is to collect and analysis the basic information of coal mine. In such a management information system, administrators can keep abreast of information in coal mine, detecting the abnormal situation timely and solving the problem effectively. Besides, the information input module in the system is easy to use, and users can also filter the information when using the system to inquiry, the query results can be outputted in tabular form. The system can also sort out all kinds of violation cases and accidents in the form of security information report, showing to the administrators. In another data analysis module of the system, it reveals the contents of the security information table by a bar chart. To ensure the security of the system, login steps are needed. Anyone who entering this system can modify the password, but each person’s permission is different, and they can only operate within their own permission scope.

Effects of coal mining, forestry, and road construction on southern Appalachian stream invertebrates and habitats.

Coal has been extracted via surface and sub-surface mining for decades throughout the Appalachian Mountains. New interest in ridge-top mining has raised concerns about possible waterway impacts. We examined effects of forestry, mining, and road construction-based disturbance on physico-chemistry and macroinvertebrate communities in east-central Tennessee headwater streams. Although 11 of 30 sites failed Tennessee's biocriteria scoring system, invertebrate richness was moderately high and we did not find significant differences in any water chemistry or habitat parameters between sites with passing and failing scores. However, conductivity and dissolved solid concentrations appeared elevated in the majority of study streams. Principal components (PCs) analysis indicated that six PCs accounted for ~77% of among-site habitat variability. One PC associated with dissolved oxygen and specific conductance explained the second highest proportion of among-site variability after catchment area. Specific conductance was not correlated with catchment area but was strongly correlated with mining activity. Composition and success of multivariate models using habitat PCs to predict macroinvertebrate metrics was highly variable. PC scores associated with water chemistry and substrate composition were most frequently included in significant models. These results suggest that impacts of historical and current coal mining remain a source of water quality and macroinvertebrate community impairment in this region, but effects are subtle. Our results suggest that surface mining may have chronic and system-wide effects on habitat conditions and invertebrate communities in Cumberland Plateau streams.

Analysis on Influence Factors of Coal Mine Capital Construction Investment Efficiency

With the development of the economy, and investment structure is more complex, more investment direction is more diversified, capital investment efficiency is affected by more factors. Deep analysis and evaluation of the efficiency of investment and the objective and fair to find the factors that are critical for any investment or personal legal person. Based on the research of domestic and foreign scholars, this paper analyzed the influencing factors of coal mine construction investment efficiency from the theoretical level.

Prestressed Concrete Building Coal Mine Stent Design

With the continuous development of China's coal technology, prestressed concrete stand in the coal mine construction jobs because of the building structure stiffness, mechanical characteristics, and other characteristics of joints less widely used. Firstly, the main concepts of prestressed concrete is analyzed, combined with the building of a coal mine stent design prestressed concrete examples of the main problems in the mine design process involved the stent to expand a detailed analysis and discussion, hoping to mine construction of large buildings play a guiding role in improving mine safety production conditions, to provide reliable protection for coal mine safety.

New development in theory and practice in mine water control in China

Mine water inrush events often occur during coal mine construction and production in China and account for a large proportion of the nation’s coal mine disasters and accidents. Figure 1 shows the number of water-related hazards and casualties in coal mines of China between 2000 and 2011. Over the 12 years, 1,089 water incidents have occurred with a total loss of 4,329 lives. As the mining depths and mining intensity continue to increase, the encountered hydrogeological conditions will become more complicated. The Chinese mining engineers and hydrogeologists have been working hard to liberate approximately 27 % of their proved coal reserves that are currently threatened with water inrushes. In battling against the water hazards, they have overcome four major challenges and developed their solutions.

Research on 3D Simulation Modeling Method of Faults Based on Coal Stratum Floor TIN

The research on 3D simulation technology for complex geological body according to geological and remote sensing data is a hot issue in current geosciences research field. The simulation and expression of coal mine structures containing faults are the main bottleneck. A new 3D interactive simulation modeling method is proposed and a relevant code is developed for the method. By using the system, the fault data can be gained from the coal stratum floor triangulated irregular network (TIN) interactively, and the 3D solid models of the fault are generated according to the results of computing the fault/coal seam intersection line, fault modeling centre lines and fault modeling influence domains. Moreover, the floor contours of coal stratum including faults can be updated quickly and accurately, which lay the foundation for precise modeling of coal body and digital mine construction.