关键词: 重复采动, 巨厚岩层, 失稳, 矿震, 灾害控制

Abstract: The instability of super-thick strata will induce tremors with large energies during repeated mining．Based on this phenomenon, the caving and movement rules of overlying strata during repeated mining were analysed, the structural form of key block in the super-thick strata as well as the stress situation and fracturing instability characteristics in different areas were further studied．Finally, the tremor mechanism induced by repeated mining was obtained．That is, first, the increase of mining height activates the gob strata, and leads to sliding or shearing instability of the hinged balance structure in roof strata, thus triggering the occurrence of mining-induced tremors．Second, the external expansion of strata movement line enlarges the horizontal and vertical move ranges of roof strata on the border areas, which results in the large-scale instability of the super-thick strata in the highly-concentrated stress area and then in terms of rock burst mechanism induced by tremor, the optimization of working face design, disturbance reduction to dangerous zones and structural strength enhancement of roadway surrounding rock were carried out to effectively ensure the mining safety in the protected face, and achieved the control goal of tremor occurred with rock burst disaster-free.

Key words: repeated mining, super-thick rock strata, instability, tremor, disaster control