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以巴准铁路敖包沟隧道为依托,基于MIDAS-GTS软件,采用摩尔-库伦弹塑性模型,对壁式采空区开采过程和隧道下穿采空区施工过程中围岩应力分布和变形分布进行数值模拟,探讨二者相互影响。研究表明隧道下穿壁式采空区时,煤层开采使采空区底板下一倍开采长度范围内围岩垂直方向出现拉应力区;隧道开挖应力释放使隧道拱顶围岩拉应力区向上发展与底板拉应力区贯通,易造成隧道拱顶上部岩体受施工扰动而破坏;隧道下穿壁式采空区施工引起采空区底板与顶板竖向位移增大,造成三倍开采长度范围内地表沉降;并且隧道拱顶受采空区底板变形的影响是引起失稳的主要原因。
Based on MIDAS-GTS software and Moore-Coulomb elasto-plastic model, the stress distribution and deformation distribution of surrounding rock during the mining process of mined-out gob and tunnel under goaf are studied. Numerical simulation to explore the interaction between the two. The results show that when the tunnel passes through the wall goaf, the mining of the coal seam causes the tensile stress zone in the vertical direction of the surrounding rock within the length of the mining under the floor of the goaf. When the stress of tunnel excavation is released, The development and the tensile stress zone of the floor penetrate easily and the rock mass in the upper part of the tunnel vault can easily be damaged by the construction disturbance. The construction of the tunnel passing through the wall gob causes the vertical displacement of the floor and the roof of the goaf increasing, resulting in a tripled mining length range The settlement of the surface of the interior; and the impact of the deformation of the bottom of the tunnel roof due to the goaf is the main cause of instability.