非对称开挖基坑两道支撑围护结构解析解  

Analytical solution of retaining structures with two-layer struting system under asymmetrical excavation

作　　者：李欣雨 徐长节[1,2,3,4] 范晓真 丁士龙 LI Xinyu;XU Changjie;FAN Xiaozhen;DING Shilong(Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,Zhejiang,China;Center for Balance Architecture,Zhejiang University,Hangzhou 310028,Zhejiang,China;Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering,East China Jiaotong University,Nanchang 330013,Jiangxi,China;Engineering Research&Development Centre for Underground Technology of Jiangxi Province,Nanchang 330013,Jiangxi,China;School of Engineering,Hangzhou City University,Hangzhou 310015,Zhejiang,China;Zhejiang Infrastructure Construction Group Co.,Ltd.,Hangzhou 310012,Zhejiang,China)

机构地区：[1]浙江大学滨海和城市岩土工程研究中心,浙江杭州310058 [2]浙江大学平衡建筑研究中心,浙江杭州310028 [3]华东交通大学江西省岩土工程基础设施安全与控制重点实验室,江西南昌330013 [4]江西省地下空间技术开发工程研究中心,江西南昌330013 [5]浙大城市学院工程学院,浙江杭州310015 [6]浙江省建投交通基础建设集团有限公司,浙江杭州310012

出　　处：《地基处理》2024年第4期347-356,共10页Journal of Ground Improvement

基　　金：国家杰出青年科学基金(No.51725802);国家自然科学基金(51878276);浙江省自然科学基金委员会——华东院联合基金(LHZ19E08 0001);浙江大学平衡建筑研究中心配套资金资助(20203512-10C)。

摘　　要：现有的基坑围护研究大多是针对对称基坑,而受建设的环境条件、地形条件以及主体结构设计方案等诸多因素影响和限制,都会导致基坑面临非对称开挖。本文基于传统等值梁法,根据基坑开挖过程中围护结构的位移,采用共同变形法对作用在浅侧围护结构上的土压力进行修正,进而推导出非对称开挖基坑两道支撑围护结构解析解。结合算例,从围护结构的土压力分布情况、围护结构的水平位移情况、围护结构插入比等方面验证该解析解的合理性。结果表明:相比于传统方法的解,运用该解析解计算出的围护结构能有效降低工程造价;在浅侧开挖深度不变、深侧开挖深度增大时,深侧对浅侧的挤压作用增大,浅侧围护结构的插入比增大。Most of the existing research on foundation pit retaining structures focus on symmetrical excavation.However,asymmetrical excavation of the foundation pit is encountered due to various factors such as environmental conditions,terrain conditions,and main structural design schemes.This paper is based on the traditional equivalent beam method.According to the displacement of the retaining structure during the excavation of the foundation pit,the earth pressure acting on the retaining structure of the shallow excavation was modified by the common deformation method,and then the analytical solution of retaining structures with two-layer struting system for the asymmetrical excavation of the foundation pit was derived.The rationality of the analytical solution was demonstrated from the distribution of earth pressure on the retaining structures,the horizontal displacement and insertion ratio of the retaining structures.The results show that compared with the traditional equivalent beam method,the retaining structures designed by the analytical solution method can effectively save the project cost.When the shallow side excavation depth remains unchanged as the deep side excavation depth increases,the squeezing effect of the deep side on the shallow side increases,and the insertion ratio of the shallow side retaining structure increases.

关 键 词：非对称开挖 基坑 等值梁法 土压力 共同变形法 

分 类 号：TU47[建筑科学—结构工程]