摘要
为了进一步优化基坑支护结构,考虑基坑支护结构存在的空间效应,以某基坑为研究背景,利用Midas/GTS NX有限元软件进行数值模拟,分析了不同形状基坑支护方案下的结构内力及位移变化规律,分析结果表明:基坑开挖后土体发生了应力释放,圆形基坑外侧土体在变形过程中相互挤压具有“楔紧”作用,使得圆形基坑的钢板桩支护方案弯矩和位移均小于多边形支护方案。同时支护结构的受力由多边形支护结构的竖向受弯特性转向为圆形支护结构的环向受压特性,对基坑的整体稳定性具有重要作用,为类似工程的设计提供了一定的参考。
To further optimize the support structure of the foundation pit,considering the spatial effect of the structure,this paper used the finite element software Midas/GTS NX to conduct the numerical simulation of a foundation pit to analyze the variation laws of the structural internal force and displacement of different shaped foundation pit support schemes.The analysis results showed that after excavating the foundation pit,the soil stress was released,and the soil mass outside the circular foundation pit had a"wedging"action by grinding against each other in the deformation process,causing the bending moment and displacement of the steel plate pile support scheme of the circular foundation pit less than those of the polygonal foundation pit support scheme.Meanwhile,the stress of the support structure shifted from the vertical bending characteristic of the polygonal support structure to the circumferential compression characteristic of the circular support structure,with an important significance for the overall stability of the foundation pit,providing a certain reference for the design of similar engineering.
作者
刘继忠
陈凯
LI Jizhong;CHEN Kai(Chongqing CISDI Engineering Consulting Co.,Ltd,Chongqing 400000,China)
出处
《山西交通科技》
2023年第4期40-44,112,共6页
Shanxi Science & Technology of Transportation
关键词
空间效应
基坑
支护方案
内力
位移
spatial effect
foundation pit
support scheme
internal force
displacement
