下伏采空区的寓仁隧道残余变形预测研究

    Research on residual deformation prediction of Yuren Tunnel in underlying goaf

    • 摘要: 寓仁隧道拟穿越太岳煤矿采空区的上覆岩层区域,该区域属于近水平煤层群,各工作面开停采时间间隔较近且距离相近,不同工作面采空区产生的沉降变形共同影响隧道沿线安全,所以准确预测采空区残余变形对隧道的影响是保障隧道建设及使用安全的关键。本文采用变采厚概率积分法对山西省太岳煤矿不同停采时间的多个采空区在2020年后的残余变形量进行预测,并分析了采空区残余变形对寓仁隧道线路的影响。分析结果表明,新建寓仁隧道线路上潜在的最大地表沉降量为366 mm,沿隧道方向最大残余水平位移为112 mm,垂直隧道方向最大残余水平位移为27 mm,最大残余倾斜变形为1.98 mm/m,最大残余曲率变形为0.033 mm/m2,均出现在隧道起点附近位置;新建寓仁隧道残余沉降量等变形量和工作面停采时间有一定相关性,停采时间越短变形数值越大,因此隧道长期稳定性受2205工作面影响较大;通过分析倾斜和曲率等参数,认为隧道有南北侧向坡度倾斜趋势及轴线受拉开裂或压缩隆起的复合变形。研究结果可为隧道穿越采空区提供场地变形预测提供参考。

       

      Abstract: Yuren Tunnel is planned to pass through the overburden area of the goaf of Taiyue Coal Mine.This area belongs to the near horizontal coal seam group.The opening and closing time interval of each working face is close and the distance is similar.The settlement deformation produced by the goaf of different working faces jointly affects the safety along the tunnel.Therefore, accurately predicting the impact of the residual deformation of the goaf on the tunnel is the key to ensure the safety of tunnel construction and use.In this paper, the variable thickness probability integral method is used to predict the residual deformation of multiple goaf in Taiyue Coal Mine in Shanxi Province after 2020, and the influence of residual deformation of goaf on Yuren Tunnel line is analyzed.The analysis results show that the potential maximum surface settlement on the new Yuren Tunnel line is 366 mm, the maximum residual horizontal displacement along the tunnel direction is 112 mm, the maximum residual horizontal displacement in the vertical tunnel direction is 27 mm, the maximum residual inclined deformation is 1.98 mm/m, and the maximum residual curvature deformation is 0.033 mm/m2, all of which appear near the starting point of the tunnel.The residual settlement and other deformation of the newly-built Yuren Tunnel have a certain correlation with the stop time of the working face.The shorter the stop time, the greater the deformation value.Therefore, the long-term stability of the tunnel is greatly affected by 2205 working face.By analyzing the parameters such as inclination and curvature, it is considered that the tunnel has the trend of North-South lateral slope inclination and the composite deformation of tensile cracking or compression uplift of the axis.The research results can provide a reference for the prediction of site deformation when the tunnel crosses the goaf.

       

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