Research on residual deformation prediction of Yuren Tunnel in underlying goaf
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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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