基于最小势能原理的深基坑吊脚墙变形研究

Study on Deformation of Underground Continuous Suspended Diaphragm wall Based on Minimum Potential Energy Principle

为应对工程中连续吊脚墙变形计算的难题,文中基于最小势能法提出了一种计算地下吊脚连续墙变形的新方法,并对实例中地下吊脚连续墙水平位移的模拟值与实测值进行对比分析,验证其可靠性。该方法引入了坑角影响因数,考虑了坑角对连续墙体变形的影响。开挖过程中的扰动、卸载与应力重分布等对岩肩部岩体力学性质的影响,会进一步增加连续墙的变形应量。

In order to solve the problem of continuous suspended diaphragm wall,a new method for calculating deformation of underground suspended diaphragm wall is proposed based on the minimum potential energy method.The reliability of the method is verified by comparing with the simulated and measured horizontal displacement of the diaphragm wall in an engineering example.Moreover,the influence factor of pit corner is introduced to consider the influence of pit corner on the deformation.The influence of disturbance,unloading and stress redistribution on the mechanical properties of the rock shoulder during excavation will further increase the deformation of the continuous wall,so the stability of the continuous hanging wall can be increased by adjusting the width of the rock shoulder.