圆形地连墙环向刚度非线性及自锁效应的研究  

Research on the Hoop Rigidity Non-Linear and Self-locking Effect of Circular Diaphragm Wall

作　　者：杨光华[1,2,3,4] 张文雨 陈富强 李支令[5] Yang Guanghua;Zhang Wenyu;Chen Fuqiang;Li Zhiling(Department of Civil Engineering,South China University of Technology,Guangzhou 510640,P.R.China;Guangdong Research Institute of Water Resources and Hydropower,Guangzhou 510635,P.R.China;The Geotechnical Engineering Technology Center of Guangdong Province,Guangzhou 510635,P.R.China;Guangdong Emergency Technology Research Center of Mountain Torrents Disasters,Guangzhou 51063,P.R.China;Guangdong Hydropower Planning&Design Institute Co.,Ltd.,Guangzhou 510170,P.R.China)

机构地区：[1]华南理工大学土木与交通学院,广州510640 [2]广东省水利水电科学研究院,广州510635 [3]广东省岩土工程技术研究中心,广州510635 [4]广东省山洪灾害突发事件应急技术研究中心,广州510635 [5]广东省水利电力勘测设计研究院有限公司,广州510170

出　　处：《地下空间与工程学报》2022年第5期1639-1648,共10页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金项目(51778152);珠三角水资源配置工程首批科研课题(WW2018229);中国博士后科学基金(2019M662827)。

摘　　要：圆形支护形式因其结构稳定、变形较小,具有拱效应等特点,使得混凝土能充分发挥其抗压能力,得以广泛应用于盾构施工工作井中。通过考虑圆形地连墙槽段间接缝泥皮的压缩变形,进而提出环向刚度折减系数的非线性变化计算方法。结果表明:地连墙环向刚度随位移增加而增加,从而发现圆形支护在变形中具有较好的自锁效应,说明其具有较好的安全性,与通常按圆形地连墙环向刚度等值折减的计算方法相比更安全且符合实际。用于珠三角水资源配置工程中开挖最深的LG03#圆形竖井进行支护变形内力分析,与实测数据进行比较,发现考虑环向刚度非线性的技术方法更符合实际,可为圆形地连墙提供一种新的计算方法。The circular support forms have the characteristics of stable structure,small deformation,and arching effect,so that the concrete can give full play to its compressive capacity and this kind of support can be widely used in shield construction work wells.A calculation method for the non-linear change of the hoop rigidity reduction coefficient is proposed by considering the compression deformation of the mud in the indirect joint of the circular ground wall groove segment.The calculation results show that the circumferential stiffness increases with the increase of displacement and it is found that the circular support has a better self-locking effect in deformation,which shows that the circular support has better safety.It is also safer and more practical than the usual calculation method of equivalent reduction of the hoop rigidity of the circular ground wall.This method is used in the deepest excavated circular shaft named LG03#shaft in Pearl River Delta Water Resources Allocation Project to analyze the internal force of the support deformation.Compared with the actual measurement data,it shows that the technical method considering the non-linearity of the hoop rigidity is more realistic and can provide a new calculation method for this structure.

关 键 词：深基坑工程 圆形地下连续墙 环刚折减系数 非线性 

分 类 号：TU476.3[建筑科学—结构工程]