Refuge Chamber Research Articles

Structural Analysis and Study on Support Technology of Refuge Chamber of Mine

As the down-hole refuge chamber is the last life support for miners, its stability structure is especially important in its design. This paper tested the loose circle of the surrounding rock of refuge chamber with double-hole method, proposed the related parameters of chamber support, and conducted numerical analysis for the deformation, damage and supporting effect of the surrounding rock by using FLAC. The result shows: the loose circle radius of this refuge chamber is about 1.7~2.0m；the surrounding rock of refuge room belongs to IV class with large loose circle, designs support parameters with anchor net spray built-up arch theory; the numerical analysis shows that the floor suffers from floor heave, so it needs to be set up with anti-arch structure and be filled with reinforcement material.

Design of Underground Coal Mine Refuge Chamber

In recent several years, coal mine tragedies had happened frequently in Chinese, a minimum life sustaining atmosphere would need to be developed to design any sort of refuge chamber for entrapped miners to await mine rescue teams. Parameters such as oxygen consumption rate, carbon dioxide exhalation rate, and maximum allowable temperatures inside such a chamber for human survival had to be defined.

Structure Analysis and Design of Coal Mine Refuge Chamber

Removable steel refuge chamber is a very important device for lifesaving in coal mine disasters, such as fire, gas explosion, roof fall, and so on. So the chamber body should have good stiffness, strength, and tightness under disaster conditions. The stiffener structure in refuge chamber body has been investigated with FEM, and a kind of design was suggested.

Lightweight Structure Design of Refuge Chamber

This paper quantitatively analyzed the optimal design direction of refuge chamber by simulating different sizes of major parts effecting its ability to resist blast .It obtained best match program for span of the supporting structures、thickness of supporting structure in side and length of wave sheet, aiming to a lightweight designed of the refuge chamber within safety ensure.

Experimental Study of Phase Change Material's Application in Refuge Chamber of Coal Mine

Abstract We identified the main heat source of the refuge chamber was hedge staff by analyzing the heat source of the refuge chamber. We identified the calculation method of the heat released by the hedge staff and calcium hydroxide when absorbed CO2. We designed the experimental program of temperature control of phase change material according to the estimate of heat dissipating capacity in 96 hours. Ultimately, we conducted simulation experiments and verified the effect of temperature control of the phase change material.

Buckling analysis of the shell of a refuge chamber in a coal mine under uniform axial compression

A stiffened cylindrical shell is normally used in refuge chambers of a coal mine. Based on the method of application and shape characteristics of a refuge chamber, we simplified its shell as an orthotropic cylinder. The basic buckling equation of the stiffened cylindrical shell under uniform axial compression was deduced by using a Donnell function. The factors affecting its buckling capacity were studied by theoretical analysis and numerical calculations. The results reveal that the torsional rigidity of the longitudinal stiffener had little effect on the buckling capacity of the shell and that the critical load of an externally stiffened cylindrical shell is higher than that of an internally stiffened cylindrical shell.

Simulation Analysis on Structure Safety of Two Typical Refuge Chamber Shell Forms Under Explosion Load

Abstract In order to reduce the risk of sealing and improve the structural strength safety for coal mine mobile refuge chamber, two models with certain proportion were set up after mechanical analysis. One was one-piece coal mine mobiles refuge chamber form which involves less sealing problems between sections, the other was segmented coal mine mobiles refuge chamber form which is easy to transport. A simulation analysis method was used to confirm their structure safety. Verified finite element analysis method was used to simulate the responses under blast loading. Considering the harsh conditions, the maximum pressure of the triangle impact load was 0.8 MPa, and the pulse width was 300ms. The maximum stress of one-piece one is less than segmented one. It demonstrated that section connecting position can cause more stress concentration. The maximum displacement one of one-piece is more than segmented one. It demonstrated that segmented type had lower displacement. Weak part of one-piece was middle position of front and back end shell. Weak parts of segmented type were middle position of sides and section connecting position. Based on their weak places analyzed, suggestions were put forward for the two kinds. Arc structure might be used in the front and back end shell. The front and back end shell might be thickened. Only inclined shaft with larger wellhead is suitable for this type. Segmented type could be used in large or medium-sized one.

Simulation Analysis on Structure Safety of Refuge Chamber Door Under Explosion Load

Abstract In order to keep strong structure and nice sealing property of refuge chamber door during its life cycle, a basic structure of the door was designed and its finite element models were established, with 10, 20, 25 mm, three kinds of thickness, respectively for numerical simulation. Finite element software ANSYS/LS-DYNA was taken in the numerical simulation part. Deformation and the sealing performance of the door under a triangle explosion shock wave with maximum value for 0.6 MPa and 300ms duration was calculated. The maximum stress value appears in the connection position between the door plank and reinforced stiffeners. The maximum displacement value appears in the middle of the door plank. Stiffeners have significant effect on the maximum displacement. The door with 20 mm thickness could fulfill the requirements of structure safety and nice sealing property. Based on analysis, suggestions were put forward for further improving.

Simulation analysis on structure safety of coal mine mobile refuge chamber under explosion load

In order to check structural strength of coal mine mobiles refuge chamber, and do security evaluation of the mobile refuge chamber, a refuge chamber model was established, then a finite element method was instituted for it to ensure the refuge chamber would not be severely damaged when gas or coal dust explosion suddenly happened. A triangle shock wave with 1.2MPa over-pressure, 300ms lasting time was settled. Explicit nonlinear dynamic analysis program was used to simulate response of the refuge chamber. The maximum stress was 244MPa, located in central part of sides and tail end of the last capsule. The maximum displacement was 29.32mm, located in central part of sides and tail end of the last capsule. The calculation indicated that the refuge chamber was not obviously damaged. It could reliable work to meet safety requirements. Compared with the reported experimental results, the simulation method was verified. Based on analysis, suggestions were put forward for further improving.

Research on Optimization and Decision Making Methodology in Technology Design of Coal Mine Refuge Chamber

In this paper, an effective optimization and decision making method was proposed to deal with the multiple attribute decision making problems in technology design of coal mine refuge chamber. It is more reasonable that both attributes’ subject weights assessed by experts (DMs) and intrinsic weights inside the alternatives are taken into account. The main factors, which affected DMs’ decision making, were analyzed and subdivided to 14 elements, and then a MADM model for chamber design was introduced subsequently. A case was studied to demonstrate the application of the model, and the results show that the chamber’s capability of withstanding overpressure, temperature control, flexibility and investment cost are crucial elements which are connected with the product’s superiority and should be paid more attention in technology design.

Simulation Optimization of Emergency Refuge Chamber based on Particle Swarm Optimization

Simulation Optimization of Emergency Refuge Chamber based on Particle Swarm Optimization

Strength Check and Optimization Design of Movable Mine Refuge Chamber

Movable mine refuge chamber is widely used in coal mines for protecting miners from coalmine accident. During a coalmine accident, there will be large heat impact load and stress on the movable mine refuge chamber caused by high temperature and high pressure. Therefore the strength of the movable mine refuge chamber should be carefully designed to meet the safety requirement with the possible lightest weight. Based on analysis of the structure dimensions, material properties, and operating conditions, a finite element model is developed with an emphasis on the effect of the layout and sizes of stiffeners and structural form of the chamber. A comparison of different design schemes is made and the calculation result is given. This work could be helpful for optimization design of China’s movable mine refuge chamber.

Analysis on Effect of Heat Bridge to Heat Transfer of Refuge Chamber’s Shell

In order to improve the heat-insulating capability of the refuge chamber’s shell and reduce energy consumption of the cooling system, the horizontal cylindrical mobile refuge chamber for coal mine was taken as the research object. By selecting two connection types between the inner shell and the outer shell for calculation, which were direct connection type and indirect connection type, and comparing these with the connectionless heat transfer, the heat transfer process in the refuge chamber subjected to thermal loadings of constant temperature was respectively discussed with numerical analysis method. Effect of heat bridges to heat transfer of the refuge chamber’s shell was analyzed. The analysis results showed that the average heat flux through direct connection heat bridge and indirect connection heat bridge had respectively increased by 668% and 30% than that of the connectionless heat transfer. The influencing scope of the former was larger than the latter’s. And more heat entered the refuge chamber through the direct connection heat bridge. Therefore, the indirect connection type should be used in the design of the refuge chamber’s shell.

Underground mine Refuge Chamber Expectations Training: Program development and evaluation

Refuge chambers are new devices for underground coal mines that provide approximately 96 h of breathable air, water, food, and supplies in the event of an emergency where miners are unable to escape. Researchers at the National Institute for Occupational Safety and Health (NIOSH) developed a training program to prepare miners for what to expect psychologically and physiologically inside of a refuge chamber. The field tests of this training revealed that it was received very positively by miners and helped impart realistic views about the physical discomforts and psychological stresses of being inside a refuge chamber.

Probing Into Design Of Refuge Chamber System In Coal Mine

Put forward the refuge chamber system composed by permanent refuge chamber, temporary refuge chamber and rescue capsule, which are mutually independent and tightly-coupled, to cost-effectively radiate all the areas with mining activities and protect personnel in mine. In addition, in order to promote the development of refuge chamber system in Chinese coal mine, propose some basically design principles of refuge chamber system and describe the arrangement principles and structure characteristics of three kinds of refuge space in the process of underground refuge chamber system design and construction. It is a significant reference for coal mine refuge chamber system construction in China.

Purification Characteristic Research of Carbon Dioxide in Mine Refuge Chamber

Refuge chamber is a kind of rescue equipment that protects trapped miners waiting for rescue in mine accidents. When a refuge chamber is in refuge state, carbon dioxide scrubbing is an important function of the environmental control system in chamber. In this paper, a series of experiments about the power consumption, purification efficiency, bed thickness and other factors of carbon dioxide scrubber in mine refuge chamber were carried out to obtain the optimal operating way. Then these parameters were testified by life supporting experiment in enclosed chamber.

Nonlinear Dynamic Compensation Research on Temperature Measurement System in Coal Mine Movable Refuge Chamber

Environmental temperature measurement is a very important issue of environmental control system in coal mine movable refuge chamber. This paper proposes a kind of dynamic compensation method for the temperature sensors by using extended Kalman filtering algorithm, which is based on the reference model. The more precise compensator has been got, by using extended Kalman filter for dynamic compensation of the parameter identification. Therefore, offset errors on the temperature sensors are automatically compensated. Experiments on simulating model have proved that the method of this paper can acquire satisfied compensation results. And, the method can be used on the temperature measuring system in the coal mine movable refuge chamber.