围护厚度对深基坑变形影响的分析

Analysis of Influence on Deformation of Envelope Thickness to Bilateral Deep Excavations

在围护结构厚度对深基坑变形的影响方面,目前的研究结果多集中在基坑某个部位的厚度变化对基坑水平位移的影响.以天津某地铁站基坑工程实例为背景,在对开挖过程进行三维数值模拟的基础上,沿基坑长度方向选取多个剖面进行分析,重点研究了围护厚度对基坑水平位移,基底隆起和坑外地表沉降这三种主要变形的影响.结果发现:围护厚度对这三种基坑变形都有不同程度的影响,其中对基坑隆起和地表沉降这两种变形的影响相当且最小,而对基坑水平位移的影响最大.围护厚度对这三种基坑变形的影响沿基坑长度方向各不相同并有如下规律:在基坑变形越大的部位,围护厚度对此处基坑的水平位移和基坑隆起这两种变形的影响也越大,而对此处地表沉降的影响却越小,反之亦然.

In the influence of the thickness of the retaining structure on the deformation of deep foundation pit,the results of the present study are mostly concentrated on the influence of the thickness of the foundation ditch on the horizontal displacement of the foundation pit.Based on the case of a metro station in Tianjin city,the paper analyzes the three dimensional numerical simulation of the excavation process,and analyzes the influence of the thickness of the retaining wall on the horizontal displacement of foundation pit,the base heave and the settlement of the foundation pit.The results show that the deformation of the three kinds of foundation pit has different degrees,and the horizontal displacement and surface settlement of the two kinds of deformation are very important,but the deformation of foundation pit is minimum.The deformation of foundation pit is different and has the following rules:In the pit deformation of the site,the thickness of the foundation pit of the horizontal displacement and excavation of the two deformation of the impact is greater,and the impact of the surface subsidence is smaller,and vice versa.