Abstract
Gas outburst is an important issue in deep coal mining. At present, the gas-rock coupling change mechanism and intensity prediction of gas outburst are not clear. The research of gas outburst simulation experiment is particularly important. The State Key Laboratory of Gas Disaster Monitoring and Emergency Technology of China independently developed a large-scale coal and gas outburst physical simulation test system. However, the influence of the design parameters of the testing machine on the stability and accuracy of the simulation experiment is unclear. The article analyzes the energy conversion in the process of gas outburst through experimental simulation phenomena and results. The experimental simulation results show that the energy released by the CO2 gas in similar materials is the most important energy source. The cracks of similar materials increase the nominal volume of similar materials, and the deformation energy stored in similar materials slightly increases. The experimental simulation results are consistent with the actual situation on site. Combined with CAE simulation analysis, the displacement and pressure of the indenter of the experimental machine remained basically unchanged during the experiment, and the system did not produce resonance. Comprehensive analysis shows that the design of the test machine meets the simulation requirements.
Highlights
China’s coal production and consumption have long ranked first in the world [1]
Before analyzing the experimental results, we obtained the stiffness of the testing machine through CAE simulation [22, 23]
The released energy comes from the decrease of temperature and the release of CO2 gas compression energy in similar materials
Summary
China’s coal production and consumption have long ranked first in the world [1]. Coal and gas outburst accidents are one of the most serious disasters that plague the safe production of underground coal mines [2, 3]. In addition to studying the cause mechanism and dynamic evolution characteristics of coal and gas outburst disasters, it can study the migration of coal and gas outburst two-phase flow in roadways and the separation and accumulation of coal dust. This experimental system provides support for research on mine coal and gas outburst disaster-prevention-control. The above problems will affect the stability and error of the gas outburst simulation experiment system The article uses this experimental system to simulate a coal and rock gas outburst accident on the 11-2 seam 1331 (1) conveyor tunnel driving face of Huainan Dingji Coal Mine on April 19, 2009. Analyze the energy change in the process of gas outburst through the phenomenon of experimental results, and determine whether the design of the testing machine meets the requirements of the simulation test
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