CHENG Lichao, ZHANG Xuedong, QU Zhengyi, LI Xinwang, WANG Hanqing, WEN Xuejun. Study on overburden rock evolution law of layered filling mining[J]. CHINA MINING MAGAZINE, 2023, 32(2): 128-136. DOI: 10.12075/j.issn.1004-4051.2023.02.009
    Citation: CHENG Lichao, ZHANG Xuedong, QU Zhengyi, LI Xinwang, WANG Hanqing, WEN Xuejun. Study on overburden rock evolution law of layered filling mining[J]. CHINA MINING MAGAZINE, 2023, 32(2): 128-136. DOI: 10.12075/j.issn.1004-4051.2023.02.009

    Study on overburden rock evolution law of layered filling mining

    • In order to study the evolution law of layered filling mining and its influence on surface subsidence, taking Xingtai Mine as an example, the numerical simulation method is used to construct the macroscopic model of stope, and the stress and migration evolution law of layered filling mining under different advancing distances are analyzed, and compared with the single-layer filling mining.The research results show that with the increase of advancing distance, the stress nephogram of mining and filling area shows the morphological characteristics of “X” weak stress area, and the “X” weak stress area of layered filling mining is larger than that of single-layer filling mining under the same conditions.The peak stress concentration in front of the layered filling mining is 21.149 MPa, which is smaller than the peak stress concentration in front of the single-layer filling mining under the same conditions of 21.650 MPa.The improvement effect of layered filling mining on mine pressure is better than that of single-layer filling mining.With the continuous advancement of the working face, the roof settlement values are increasing, and the roof migration equivalent areas are arched.The distribution is symmetrical centered on the settlement extremum, and moves with the advancing direction of the filling working face.The extreme value of roof settlement of layered filling mining is 74.969 cm, which is smaller than the maximum value of roof settlement of single-layer filling mining under the same conditions of 75.790 cm.The layered filling mining has a better control effect on the overlying strata in the mining and filling area, and the roof activity is relatively small.The extreme value of the surface subsidence of the layered filling mining is 60.23 cm, which is smaller than the extreme value of the surface subsidence of the single-layer filling mining under the same conditions of 60.83 cm.The layered filling mining has less influence on the mining disturbance of the surface subsidence.

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