In order to control the large deformation of the tunnel and ensure the construction safety,based on the Guixi Tunnel,numerical simulation and nonlinear planning were used to study and opti-mize the support structure parameters that affect the stability of the tunnel,such as shotcrete thick-ness,grouting reinforcement thickness,and anchor length.The results show that increasing the shot-crete thickness,grouting thickness and anchor length can effectively reduce the deformation of the critical point of the surrounding rock and the volume of the plastic zone,but when these parameters are too large,the support effect will be weakened.Therefore,sampling calculation and non-linear programming are used to optimize the cost and performance combination of these three support param-eters,thus obtaining the optimal support parameters as a construction plan with a shotcrete thickness of 24 cm,anchor rod length of 3 m,and grouting reinforcement thickness of 0.5 m.
关键词
软岩隧道/支护结构影响/支护结构优化/数值模拟/非线性规划
Key words
soft rock tunnels/support structure effects/support structure optimization/numerical simulation/nonlinear programming
维普
万方数据