邻近地铁隧道基坑开挖位移控制分析与优化

ANALYSIS AND OPTIMIZATION OF DISPLACEMENT CONTROL OF FOUNDATION PIT ADJACENT TO METRO TUNNEL

为了探究中隔墙在基坑开挖条件下对隧道结构位移的控制情况,将中隔墙分别设置在不同位置工况下,研究结果表明设置在距离隧道一定水平距离的悬臂式中隔墙可以有效地控制基坑围护和隧道结构的水平位移及隧道竖直方向的净空收敛,但是埋入式中隔墙对基坑和隧道的位移控制效果更好,且埋入式中隔墙的墙顶应设置在隧道水平位移影响区内,越靠近水平位移影响区的下边界时控制效果越好。

In order to explore the control of the middle partition wall on the tunnel structure displacement under the condition of foundation pit excavation,the middle partition wall is set at different positions.The results show that the cantilever middle partition wall set at a certain horizontal distance from the tunnel can effectively control the horizontal displacement of foundation pit support and tunnel structure,meanwhile,it can control the clearance convergence in the vertical direction of the tunnel.However,the embedded middle partition wall is better under the same conditions,and the top of the embedded middle wall should be set in the horizontal displacement influence area of the tunnel.The closer to the lower boundary of the horizontal displacement influence area,the better the control effect is.