摘要
弧形深基坑是一个复杂的三维空间,而现行规范难以考虑弧形基坑的空间效应。本文以弧形结构和坑周土体为研究对象,根据弧形结构的受力特点以及土拱效应的发生机理分析弧形基坑的空间效应;就弧形基坑的空间效应进行了数值模拟并结合监测数据,研究土体及支护结构位移特性、土压力分布规律以及基坑边坡的稳定性,同时讨论空间效应的影响因素。结果表明:弧形基坑的空间效应本质是土拱效应以及环向拱效应;弧形基坑空间效应随着矢跨比f/l、黏聚力C、深度H的增大而增大,随着内摩擦角φ增大呈先增后减的趋势;研究结果与二维平面分析的结果存在差异,可为进一步的理论研究和工程应用提供参考依据。
The arc-shaped deep foundation pit is a complex three-dimensional space,and the current code is difficult to consider the spatial effect of an arc-shaped foundation pit.This paper takes the arc-shaped structure and the soil around the pit as the research object,and analyses the spatial effect of the arc-shaped pit according to the force characteristics of the arc-shaped structure and the occurrence mechanism of the soil arch effect;numerical simulation of the spatial effect of the arc-shaped pit is carried out and combined with the monitoring data to study the displacement characteristics of the soil body and the support structure,the soil pressure distribution law and the slope stability of the pit,and also discusses the influencing factors of the spatial effect.The results show that the essence of the spatial effect of the arched foundation pit is the soil arch effect as well as the circumferential arch effect;the spatial effect of the arched pit increases with the increase of the vector-to-span ratio f/l,cohesion C and depth H,and tends to increase and then decrease with the increase of the internal friction angle φ;the research results are different from the results of the two-dimensional plane analysis,which can provide a reference basis for further theoretical research and engineering application.
作者
张宇
张莲花
ZHANG Yu;ZHANG Lianhua(School of Environment and Civil Engineering,Chengdu University of Technology,Chengdu 610059,China)
出处
《建筑结构》
北大核心
2023年第S02期2480-2487,共8页
Building Structure
关键词
弧形深基坑
空间效应
机理分析
数值模拟
影响因素
arc-shaped deep foundation pit
spatial effect
mechanism analysis
numerical simulation
influence factor
作者简介
第一作者:张宇,硕士研究生,主要从事研究岩土工程方向的研究,Email:1103537852@qq.com。
