圆形地下连续墙环向刚度影响因素及折减系数取值研究  

Study on the Influencing Factors of Circular Diaphragm Wall Circumferential Stiffness and the Value of Reduction Coefficient

作　　者：杨建喜 陈富强[2,3] 杨光华 张文雨[4] 李支令 YANG Jianxi;CHEN Fuqiang;YANG Guanghua;ZHANG Wenyu;LI Zhiling(Guangdong Yuehai Pearl River Delta Water Supply Co.,Ltd.Guangzhou 511458,China;Guangdong Research Institute of Water Resources and Hydropower Guangzhou 510635,China;The Geotechnical Engineering Technology Center of Guangdong Province Guangzhou 510635,China;Maoming Municipal Government Investment Project Agency Construction Center Maoming 525000,China;Guangdong Hydropower Planning&Design Institute Co.,Ltd.Guangzhou 510635,China)

机构地区：[1]广东粤海珠三角供水有限公司,广州511458 [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]茂名市政府投资项目代建中心,广东茂名525000 [5]广东省水利电力勘测设计研究院有限公司,广州510635

出　　处：《广东土木与建筑》2023年第5期1-6,41,共7页Guangdong Architecture Civil Engineering

基　　金：珠三角水资源配置工程首批科研课题(WW2018229);国家自然科学基金(52078143)。

摘　　要：圆形地连墙环向刚度折减系数的不同取值对结构内力和变形计算结果的影响很大。为了更准确、合理并量化确定环向刚度折减系数,采用理论分析和有限元计算,研究了多边形代替“真圆”导致墙体有效厚度的折减、地连墙垂直度误差导致墙体有效厚度的折减、相邻槽段间泥皮厚度对墙体环向刚度的削弱、槽段接头的类型(刚接、铰接和柔性)的影响和地面超载不均匀对环向刚度的定量化影响。分析表明影响圆形地连墙环刚折减系数取值的因素多且复杂,目前尚无法给出一个定量化的计算公式,但可以在设计计算时,先分别计算出各因素影响的折减系数,以量化其影响程度,最后综合判定环向刚度折减系数的取值。文章的分析方法对圆形地连墙环向刚度折减系数取值如何减少人为经验取值影响,为取值定量化提供了新的途径,值得推广采用。Different values of the circumferential stiffness reduction coefficient of the circular diaphragm wall have a great influence on the calculation results of the internal force and deformation of the structure.In order to determine the hoop circumferential reduction coefficient more accurately,reasonably and quantitatively,theoretical analysis and finite element calculation are used to study the theoretical“true circle”wall thickness reduction caused by the polygonal diaphragm wall composed of multiple linear groove sections,the wall thickness reduction caused by staggering between wall sections due to construction error of groove section verticality,the weakening of the circumferential compression stiffness of the circular diaphragm wall by the mud between wall sections,the influence of the of joint type(rigid joint,hinged joint and flexible joint)and the quantitative influence of uneven ground overload on the circumferential stiffness.The analysis shows that there are many and complex factors affecting the value of the circumferential stiffness reduction coefficient of the circular diaphragm wall.At present,a quantitative calculation formula cannot be given.However,in the design and calculation,the reduction coefficients affected by each factor can be calculated separately to quantify their influence degree,and finally the value of circumferential stiffness reduction coefficient can be comprehensively determined.The analysis method in this paper provides a new way for quantifying the value of circumferential stiffness reduction coefficient of circular diaphragm wall,which is worth popularizing and adopting.

关 键 词：圆形地下连续墙 环向刚度 影响因素 折减系数 定量化 

分 类 号：TU91[建筑科学—建筑理论]