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某矿采空区具有规模大、数量多、空间关系复杂等特点,急需开展复杂采空区群稳定性课题的研究。在对采空区群及其开采环境现场调研的基础上,进行了现场点荷载试验与室内单轴抗拉、抗压强度实验,获得岩体力学参数。采用三维有限元方法对该矿进行数值模拟,模拟结果表明:该矿采空区稳定性偏低,部分空区顶板出现拉应力集中,有可能出现顶板冒落。根据分析结果,提出了相应安全对策,为矿山的安全生产起到指导作用。
The mined-out area of a mine is characterized by its large scale, large quantity and complex spatial relations. It is urgent to study the stability of complex mined-out areas. Based on the field investigation of the goaf area and its mining environment, site point load tests and uniaxial tensile and compressive strength tests were carried out to obtain mechanical parameters of rock mass. Three-dimensional finite element method is used to simulate the ore. The simulation results show that the stability of the mined-out area is low, the tensile stress is concentrated on the roof of some empty areas, and roof caving may occur. According to the analysis results, the corresponding safety measures are put forward, which can guide the safety production of mines.