1.School of Resources & Civil Engineering,Northeastern University,Shenyang 110819,China
2.Institute of Mining and Coal,Inner Mongolia University of Science & Technology,Baotou 014010,China. Corresponding author: CAO Jian-li,E-mail: caojianli@mail. neu. edu. cn
The ore pillar between adjacent goaf usually accumulates a large amount of energy, and the ore pillar instability will lead to large-scale caving hazard accidents. Therefore, a caving-induced mechanical model of goaf was constructed. The caving characteristics and mechanism of the overlying rock in the adjacent goaf were studied through physical experiments and numerical simulation, and a new method of caving induced by ore pillar treatment of the adjacent goaf was proposed. The results show that the existence of the ore pillar can carry a certain amount of energy accumulation, so that the overlying rock above the ore pillar is deformed and destroyed to a certain extent. After the ore pillar is removed, caving of the upper rock mass occurs, and the caving block is small as a whole; it is not easy to induce large-scale overall caving, which can avoid the impact gas wave disaster. The repeated formation and dissipation of stress arches make the overlying strata of the goaf appear intermittent caving, and the development and connection of tensile damage in the overlying strata of goaf are the main reasons for the fracture development and caving of the overlying rock. Engineering practice has shown that this method is characterized by safety and low cost and can provide guidance and reference for the management of goaf under similar conditions.
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