带浅内坑基坑的动态施工数值模拟

结合上海市西藏南路越江隧道浦东接线段某坑中坑基坑工程,建立有限元数值模型对基坑动态施工进行数值模拟。内坑开挖造成两侧地表有不同程度的沉降,靠近内坑一侧地表沉降较大。当开挖至内坑底部后,右侧最大沉降为左侧的1.6倍。内坑开挖造成左墙底部往坑内发生较大侧向位移。中墙顶部发生坑外位移,中、底部发生坑内侧移。右墙中底部侧移较大,且最大侧移处位于地表以下1.2倍的开挖深度。

On Dynamic Construction Numerical Simulation of a Foundation Pit with Shallow Inner Pit

Combined with some inner pit project of Pudong connecting line section of Shanghai South Xizang Rd.Crossriver Tunnel,the foundation pit dynamic construction is made numerical simulation by building limited element numerical model.The inner pit excavation has caused settlements with different degree of two sides and the side close to the inner pit has more settlement.When the excavation is arriving at the bottom of the inner pit,the maximum settlement of the right side is 1.6 times than that of the left side.The inner pit excavation has caused large side displacement from left wall bottom to the pit inside.Pit outside displacement is appeared on the top of the middle wall;pit inside displacement appeared on the middle & the bottom.The side displacement on the middle & the bottom of right wall is larger and the maximum displacement is appeared on the 1.2 times excavation depth bellow the ground surface.