广东地区地下变电站深基坑工程对周边环境影响数值分析

Numerical analysis of the impact of deep foundation pit engineering of underground substation in Guangdong on its surroundings

以广州地区典型地质状况以及变电站尺寸为依托,通过建立三维有限元模型,研究了基坑开挖深度、基坑与邻近结构距离以及基坑支护形式对邻近地铁隧道以及高架桥桩基的影响。结果表明,邻近基坑开挖主要影响桥桩的水平位移,且最大水平位移发生在桩顶附近;邻近基坑开挖主要影响隧道的竖向位移,且最大竖向位移发生在基坑中部。改变基坑支护的地连墙厚度、嵌固深度、内支撑截面尺寸对控制邻近基坑桥桩和隧道结构的位移效果一般,基坑开挖深度和基坑距邻近结构的净距对其影响更为显著。

Based on the typical geology of Guangzhou and the size of substations,this paper studies the influence of excavation depth,distance between foundation pit and adjacent structures,and foundation pit support type on adjacent subway tunnels and viaduct pile foundations by establishing a three-dimensional finite element model.The results show that the adjacent excavation mainly affects the horizontal displacement of the bridge piles,and the maximum horizontal displacement occurs near the pile top.The adjacent excavation mainly affects the vertical displacement of the tunnel,and the maximum vertical displacement occurs in the middle of the foundation pit.Changing the thickness of the ground connecting wall,the embedded depth,and the size of the internal support section of the foundation pit support has a general effect on controlling the displacement of adjacent foundation pit bridge piles and tunnel structures.The impact is more significant.