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Abstract
Numerous field examples of coal seam mining show that when coal seams under confined water are mined close to faults, water inrush effects on complex mining surfaces occur. Obeying similarity rules, physical similarity models consisting of sand, lime, and plaster were used to investigate the water conducting process, along with stress and displacement measured by a combination of mechanical senor, total station, and video camera-. Comparing the physical model tests with the calculation results of elastoplastic limit equilibrium theory, the rationality of the model has been verified. Besides, a safe width of the waterproof coal pillar has been obtained. It can be demonstrated from the model observations that the coal seam in front of the mining can be divided into three areas with different characteristics of stress and displacement, namely, which are the fault-affected area, the elastic area, and the plastic yield crack area. A closed-loop water inlet and outlet pipeline composed of a water control platform that can provide stable water pressure, and water bags pre-buried in the fault was used to simulate the water conduction in the fracture zone. Integrate the development law of stress, displacement, and water conduction coming from the upper and lower walls of the fault to further determine the reasonable width of the waterproof coal pillar.
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Details
1 Central South University, School of Civil Engineering, Changsha, China (GRID:grid.216417.7) (ISNI:0000 0001 0379 7164)
2 Central South University, School of Civil Engineering, Changsha, China (GRID:grid.216417.7) (ISNI:0000 0001 0379 7164); Central South University, National Engineering Research Center of High-speed Railway Construction Technology, Changsha, China (GRID:grid.216417.7) (ISNI:0000 0001 0379 7164)
3 Anhui Jianzhu University, School of Civil Engineering, Hefei, China (GRID:grid.440647.5) (ISNI:0000 0004 1757 4764)
4 Qingdao Hisense Real Estate Co. Ltd, Qingdao, China (GRID:grid.216417.7)