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采用FLAC3D对矿区原有和后续采矿活动进行仿真模拟,对其形成原因进行研究。研究表明:在原有采空区形成过程中,空区顶板覆岩形成显著应力集中,促使空区顶板覆岩遭受剪切破坏,完整性降低,岩体移动影响地表上升位移,围岩介质承受张应力状态,裂隙呈现张开状态,加上降雨使得地表水渗入空区顶板覆岩裂隙,降低岩体强度,这些内外因素共同诱发地表冒落塌陷。
FLAC3D was used to simulate the original and subsequent mining activities in the mining area and to study the causes. The research shows that during the formation of the original goaf, the overlying strata of the roof of the open area are formed with significant stress concentration, which makes the overburden strata in the open area suffer shear failure, the integrity is reduced. The movement of the rock mass affects the upward displacement of the ground surface, In the stress state, the fractures are in an open state. When rainfall is added, surface water infiltrates into the cracks in the overlying strata of the roof of the open space and reduces the strength of the rock mass. These internal and external factors jointly induce the landslide collapse.