基坑围护结构破坏引起邻近土体位移场分析

ANALYSIS OF ADJACENT SOIL DISPLACEMENT FIELD CAUSED BY THE FAILURE OF DOUNDATION PIT ENCLOSURE STRUCTURE

地下空间开发不断深入,围护结构作为基坑工程的重要组成其安全问题不容小觑,维护结构变形研究具有重要现实意义。建立plaxis2d有限元模型以模拟基坑破坏后对基坑围护结构以及围护结构周边环境影响分析,各道水平内支撑破坏引起邻近水平内支撑轴力增加,邻近内支撑处地下连续墙剪力与弯矩增大,最大值点为基坑底部的水平内支撑;基坑底部水平支撑破坏后对围护结构造成的影响最大。同时底部水平支撑破坏对基坑周围地表与深层土体沉降比其余内支撑破坏影响更加明显。

The development of underground space continues to deepen. As an important component of foundation pit engineering, the safety structure can not be underestimated. Maintaining structural deformation research has important practical significance. By establishing Plaxis 2Dnumerical models,this paper adopts numerical simulation study on the foundation pit retaining structure and its surrounding environment after the foundation pit is destroyed and finally draws the following conclusions: the failure in each horizontal support causes the axial forceof the adjacent inner horizontal support to increase, and the shear force and bending moment of the underground continuous wall near the inner support increases.The maximum point is the horizontal inner support at the bottom of the foundation pit;.The horizontal support at the bottom of the foundation pit has the greatest impact on the retaining structure. At the same time, the horizontal support failure has more obvious influence on the settlement of the ground and deep soil around the foundation pit than the other internal support damage.