峨汉高速隧道开挖与采空区静力交互作用影响

Static interaction effects of excavation of Ehan High Speed Tunnel and the goaf

隧道施工会对周围岩层产生干扰,当隧道临近采空区时,岩层扰动将会与采空区产生交互作用,影响隧道施工安全。本文以峨汉高速大为1号隧道临近采空区段施工为例,采用有限元分析软件进行数值模拟分析,将数值模拟结果中的隧道和采空区的特征点进行竖向应力结果提取,并假设采空区对隧道竖向应力影响较小,将设有采空区和不设采空区两种工况下的竖向应力结果进行对比分析,利用假设检验相关公式进行数据处理,检验结果通过原假设。计算结果表明:距离隧道水平方向217 m、竖直方向30 m范围之外,隧道施工与采空区之间的交互影响较小,可正常开展施工。

Tunnel construction will interfere with the surrounding rock strata.When the tunnel is near the goaf,the rock strata disturbance will interact with the goaf and affect the safety of tunnel construction.In this article,the construction of a section near the goaf of Ehan Expressway Dawei Tunnel NO.1 is taken as an example,the finite element analysis software is used to establish the model,and the numerical simulation analysis is carried out.The vertical stress results of the characteristic points of the tunnel and the goaf in the numerical simulation results are extracted,and it is assumed that the goaf has little influence on the vertical stress of the tunnel.The vertical stress results under two working conditions with and without goaf are compared and analyzed,and the relevant formula of hypothesis test is used for data processing,and the test results met the null hypothesis.The final calculation results show that beyond the range of 217 m in the horizontal direction and 30 m in the vertical direction of the tunnel,the interaction between the tunnel construction and the goaf is small,and the construction can be carried out normally.