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山西某隧道下伏两层采空区,虽经注浆充填,但上覆岩体变形已经发生,为了研究两层采空区的叠置效应对隧道整体稳定性的影响,采用三维有限元法模拟了该两层煤矿开采及充填过程,得出其上覆岩体在采空后的变形移动特征及应力场的分布和采空区充填后的地表残余变形。通过对模拟结果的分析,结合钻孔及物探资料,划分了其覆岩垂直变形带,从而确定复式采空区覆岩变形带与隧道的空间几何关系,据此分析评价该隧道的整体稳定性,经验证所得评价结果可作为指导隧道开挖施工的依据。
In order to study the effect of overburden of two gobs on the overall stability of the tunnel, three-dimensional finite element method The process of mining and filling of the two coal mines was simulated. The deformation and movement of the overlying rock mass after mining and the distribution of stress field and the residual deformation of the ground after the goaf was filled were obtained. Through the analysis of the simulation results and the drilling and geophysical data, the vertical deformation zone of the strata is divided to determine the geometric relationship between the strata deformation zone and the tunnel. Based on this, the overall stability of the tunnel is analyzed and evaluated , The results of the evaluation can be used as a guide to guide tunnel excavation construction.