深大坑中坑基坑围护结构离心模型试验研究  

Centrifugal model test study on foundation pit retaining structure in large and deep pit

作　　者：李波[1] 王志鹏 龚壁卫[1] 黄鹄 胡勇[3] 

机构地区：[1]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010 [2]中国市政工程西北设计研究院有限公司深圳分公司,广东深圳518000 [3]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《中国水利水电科学研究院学报》2017年第4期303-307,313,共6页Journal of China Institute of Water Resources and Hydropower Research

基　　金：国家自然科学基金项目(51308067);中央级公益性科研院所基本科研业务费项目(CKSF2017012/YT);科技公益性应用研究项目(2016GY19)

摘　　要：圆形地下连续墙作为一种受力合理的围护结构,由于空间"拱效应"的存在,作用在拱圈上的土压力主要在地下连续墙内自身平衡,地下连续墙的水平位移相对较小。基于某深大圆形基坑工程实际,采用离心模拟技术研究基坑开挖过程中基坑围护结构的水平位移和弯矩分布规律。分析表明,基坑地下连续墙最大水平位移为11.6mm,位于上部基坑的中下部,并且随着开挖深度增大,墙体位移逐渐增大且最大位移点不断下移。研究成果可为圆形基坑开挖和支护过程中围护结构的变形规律分析提供参考。At present,the circular wall is used as a reasonable envelope structure. Due to the existence ofthe space'arch effect',the earth pressure acting on the arch ring is mainly balanced in the wall and thewall. The retaining structure is mainly subjected to the ring axial force,which can give full play to thecharacteristics of high compressive strength of concrete,so round the lateral displacement of the wall is rel-atively small. Based on the actual construction of a deep circular foundation pit,the distribution of earthpressure in foundation pit excavation and the horizontal displacement and bending moment distribution ofground and wall are studied by centrifugal simulation. The maximum horizontal displacement of the founda-tion wall is 23.6mm,which is located in the middle and lower part of the upper foundation pit,and withthe excavation depth increasing,the wall displacement gradually increases and the maximum displacementpoint. The active earth pressure of the circular foundation pit is smaller than that of the flattened earthpressure,and it is nonlinear. The effect of the arching effect is obvious. With the excavation depth increas-ing,the depth and radius ratio of the excavation depth The pressure distribution has a significant effect.The research results provide a reference for the study of the distribution model of earth pressure and theanalysis of deformation law.

关 键 词：坑中坑 离心模型试验 拱效应 变形 

分 类 号：TU472[建筑科学—结构工程]