The invention discloses a mine compound dynamic disaster simulation test method considering a roof influence. The method comprises the following steps of installing a prepared coal and rock combination body test piece which is pasted with a strain gauge into a high pressure resistance sealing cavity; completing installation and debugging of other equipment and starting the equipment; vacuumizing, carrying out air inflation, loading and monitoring air pressure of the cavity, a respective strain of a coal and rock body and an acoustic emission characteristic in real time; and at the moment when a test piece is damaged, relieving the pressure through an explosion-proof high-speed pneumatic valve, and observing and analyzing a dynamic appearance characteristic in a catastrophe process. The invention simultaneously provides a mine compound dynamic disaster simulation test system considering the roof influence. In the invention, all stages of mine compound disasters and catastrophes can be systematically monitored and data support is provided for accurate analysis of each stage of the catastrophe. The method has important theoretical significance and an engineering value, and also has positive significance for prediction and prevention of the mine compound dynamic disasters, such as rock burst-coal induced by deep mining, outburst of a gas and the like.

Mine compound dynamic disaster simulation test method considering roof influence

The invention discloses a device for filtering coal dust and a device for directly determining the gas content of a coal seam, comprising a filtering device, a pulverizer and a gas collection monitoring device. The filtering device comprises a storage component and flexible fillers. The storage component has a sealed cavity, and an inlet pipe and an outlet pipe that communicates with the sealed cavity. The flexible fillers are disposed in the sealed cavity and between the inlet pipe and the outlet pipe. The gas collection monitoring device comprises a PE vertical pipe, and a PE double-antibodypipe disposed at the upper end of the PE vertical pipe. The PE vertical pipe is provided with detecting branch pipes arranged at intervals, and the detecting branch pipes are welded with the PE vertical pipe. A pipeline type methane sensor is installed at the top cap of the top of the PE vertical pipe. The filter device is disposed between the pulverizer and the gas collection monitoring device.The device solves the problem that the coal dust blocks rubber pipes, has the advantages of real-time monitoring and collection and utilization of gas, and improves the precision of the measurement data of the device for directly measuring the gas content of the DGC type coal seam.

Device for filtering coal dust and device for directly measuring gas content of coal seam

The invention belongs to the technical field of gas pressure determination, and discloses a coal seam mining-induced fissure field gas pressure determination system. The system includes a mining-induced fissure gas flow construction module, a pressure adding module, a displacement detection module, a stratum stress calculation module, an excavation damage distribution marking module, a gas seepagepressure calculation module and a mining-induced fissure gas pressure construction module. The mining-induced fissure gas flow construction module is connected with the pressure adding module and themining-induced fissure gas pressure construction module. The pressure adding module, the displacement detection module and the stratum stress calculation module are connected in sequence. The excavation damage distribution marking module, the gas seepage pressure calculation module and the mining-induced fissure gas pressure construction module are connected in sequence. According to the system,force analysis can be carried out on a coal seam mining-induced fissure, an excavation position can be marked, thus stratum stress and gas seepage pressure can be calculated, then a clear and easy-to-understand model can be constructed, occurrence of coal mine gas dynamic disasters is effectively prevented, and a safety index of mining personnel is increased.

Coal seam mining-induced fissure field gas pressure determination system

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Coal seam mining-induced fissure field gas pressure determination system