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| Physical simulation study on stress distribution of coal seam floor with mining depth exceeding one kilometer |
| Lu Gang1,2 |
| 1. Hebei Coal Research Institute CO., LTD.， Xingtai 054000， China; 2. Hebei Mine Microseism Key Laboratory,
Xingtai 054000， China |
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Abstract The tectonic stress of deep rock mass is significant. When the coal seam with mining depth exceeding one kilometer is mined, the mine pressure appears violently, the floor heave and floor damage are serious, and the floor stress has a far-reaching impact. There is a danger that confined water conduction zone is disturbed, and aquifer is conducted, which causes water outburst. In this paper, according to the actual mining situation of working face with mining depth exceeding one kilometer of Xingdong Mine in North China Coalfield, the indoor physical simulation model was established, and the stress boxes were arranged in the coal seam floor to study the stress distribution characteristics of the floor during the advancing process of the large mining depth working face. The test results showed that: in the horizontal direction of the floor near the coal seam, the influence range of the advance abutment pressure was 100 m; the stress influence range of mining on the floor reached near the Fuqing limestone aquifer, and the stress influence depth was 90 m below the floor. It reflected that there was still a certain area under the floor failure zone, and stress disturbance occurred with mining. The research results had theoretical guiding significance for the safe mining of large mining depth coal seam.
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