深基坑超挖施工围护结构变形分析

摘要

在处于具有流变性土层的深基坑工程施工过程中,时有发生超挖未能及时设置支撑的现象,由于土的蠕变特性,导致围护结构变形急剧增大.通过弹粘塑性本构模型的二次开发,对软土地区深基坑施工过程中的正常开挖及时支撑和超挖两种情况进行数值模拟,分析深基坑围护结构变形随时间的变化规律及深基坑的安全性状,以达到有效控制基坑变形和保护周围环境的目的.%During the excavation of foundation pit in rheological soil layer, the phenomena of over-excavation and support setting not timely occur frequently, and the characteristics of soft-soil creep, the deformation of retaining structures is increase sharply. With the secondary development program of the elastic-viscose-plastic constructive model, simulate the conditions of normal construction and over-excavation of foundation pit in Soft clay area, analyze the time change regulation of retaining structures and safety state of foundation pit,in order to achieve effective control of the deformation and protect the buildings adjacent to foundation pit.