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| Study on stress distribution and rock movement in the surrounding rock of filling mining working face |
| Li Hehe, Ji Yuxin, Song Gaofeng |
| School of Civil Engineering, North University of Technology, Beijing 100144, China |
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Abstract The filling mining working face of ZhaoGu No. 2 Mine was taken as the engineering background, PHASE 2D finite element software was used to establish a numerical model to study the stress distribution and rock movement law of the filling mining surrounding rock, and analyze the deformation of the coal wall and surrounding rock, the distribution of supporting stresses in front and behind the working face, the change law of vertical displacement and peak supporting pressure of the working face under different advancing distance. The numerical simulation results showed that the front of the coal wall of the working face had different degrees of plasticity, and the horizontal direction of the coal wall had a certain degree of deformation; the support pressure in front of the working face increases first and then decreased, and the peak coefficient of support pressure was 1.8, and the support pressure in the back of the working face showed a trend of increasing first and then stabilizing, and finally all returned to the original rock stress level; with the advance of the working face, the vertical displacement of the overburden gradually increased. The maximum value of vertical displacement moved forward with the advance of mining, and the maximum vertical displacement was 45 mm; the peak abutment stress first increased and then stabilized.
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