Papers by Keyword: Deep Mine

Abstract: When tunneling deep sandstone roadway of-350m level in Yongrong mining area, it appears frequent occurrence of rock burst and gas dynamic phenomenon. Through discussing tectonic stress field, tunneling stress field, self-weight stress field and physico-mechanical properties of middle-fine sandstone, this paper draws sandstone outburst mechanism with rock drivage in mine coal-bearing.

Abstract: By means of MTS electro-hydraulic servo system, specimens from deep coal mine rock are conducted the permeability characteristics experiment under the condition of the stress-strain process and high pore-water pressure, also the results show that both the permeability rate and volumetric strain curves are V shaped, which link the dynamic changes of the microscopic fracture porosity and corresponds with the stress-strain. Meanwhile, under certain external conditions, whether the change of the pore-water pressure can improve the permeability properties or not, it depends on the critical threshold, moreover, the permeability properties under pore-water pressure higher than critical threshold have been improved several times than that at low pore-water pressure, and the peak of strain-permeability rate has a corresponding change with the peak of stress-strain curve, which shows a hysteretic characteristic. The higher the pore-water pressure is, the lower peak strength is needed, the more distinctive effects of dilatation emerge, and the more strain is needed for the appearance of permeability peak, This article provides the basis for the employment of high pore-water pressure to improve the permeability and disaster prevention of coal rock water injection.

Abstract: Mine into the deep mining, the power disaster occurs mechanism more complex features fuzzy disasters and hazards common. Outburst and rock burst and other disasters are common differences, the use of traditional coal seam outburst hazard identification method has limitations. According to the kilometers deep test area, the individual indicators law 13-1 coal seam the outburst hazard identification,13-1 coal seam first mining area were identified as non-prominent seam. While outburst identification test area seam burst tendency identification,13-1 coal seam has a strong burst tendentious. The test mine disaster prevention should also consider bumping prevention and control not only consider the gas control. Project research results have important reference conditions similar to mine.

Abstract: To explore support technical problems in deep soft rock roadway, according to deep complicated geological conditions in 102 transport rise of Yuandian Mine, obtaining deformation characteristics of roadway in the initial support scheme under conditions, analysing the reasons of instability and failure of surrounding rock, proposing the surrounding rock control technology of step-by-step strengthen co-supporting, determining secondary anchor cable strengthen support time and grouting delay distance, optimizing the parameters of roadway support. Industrial practice show that the control effect of deformation was obvious,which provide the reference for deep soft rock tunnel support decision.

Abstract: With the increasing of exploitation scope and intensity, the deep mining would be the essential choice, where the heat-harm of high temperature becomes one of the main barriers. Through analyzing the thermal damage feature, the cooling technology were be used that put the mine discharge as cold source to control the heat harm. By disposing three main workstation, the technology can be accomplishes its operations and corresponding functions in different exploitation level. Particularly, the exchanged heat source form the workplace is taken to ground heating by the circulating water which being acted as a carrier. It show that the design concept of this technology include protect the environment and reduce the emission of deleterious air. The results of the project illustrate that the technology to control the heat-harm is efficient. The temperature of the workplace is brought down to 26-29 centigrade, and is 4-6 centigrade lower than the original, and the relative humidity is 5-15﹪ lower than before. It is greatly improves the working environment of the workplace where the heat-harm of high temperature and high humidity lasts for a quite long time. In addition， it extracts deep geothermal energy successful replacing ground fired boiler for heating, further reducing environmental pollution.

Abstract: Based on four typical mining condition, such as implementation gob-side entry retaining under sandstone roof, long length and long time gob-side entry retaining, implementation gob-side entry retaining under mudstone roof and implementation gob-side entry retaining at depth of more than 900 m, this paper analysis the roadway maintenance-control in no pillar simultaneous extraction of coal and gas engineering, research on the roadway maintenance-control technology during exploitation and before mining, further study typical convergence characteristics of gob-side entry retaining after mining, drew in application of no pillar simultaneous extraction of coal and gas in deep mine, proposed evaluation about the project current existing problems and development trends.

Abstract: With the deep mining in coal mine, heat damage is one of the technical issues need to be solved. HEMS cooling system in Sanhejian Coal Mine is a process system for high-temperature heat damage controlling in deep coal mine, in which cool energy extracted to reduce work face’s ambient temperature to achieve heat damage controlling. Part of the cool energy is from the level circulating of cooling water in -700 level main raodway, the other is from the mine water. We analyze the energy consumption of every subsystem during operation of the HEMS system, which could provide a theoretical basis and technical guidance on more efficiently running of cooling system deep in the future.

Abstract: Heat damage caused by deep mining is the inevitable trend in coal mine development. HEMS cooling system is a process system for high-temperature heat damage controlling in deep coal mine, in which cool energy in mine water extracted to reduce work face’s ambient temperature, to achieve heat damage controlling. We analyze the energy consumption of every subsystem during operation of the HEMS system, which could provide a theoretical basis and technical guidance on more efficiently running of cooling system deep in the future.

Abstract: With the depth of coal mine increasing, it appeared a phenomenon of rapid floor heave in some roadways in a short time, which threaten greatly to the normal mine production and the lives safety of workers. The causes and control measures about rapid floor heave are analyzed in this paper. Which has a certain reference values for preventing and controlling rapid floor heave in deep mine.