基坑开挖对邻近既有道路影响的两阶段分析法  

Two-Stage Analysis Method for Influence of Foundation Pit Excavation on Adjacent Existing Roads

作　　者：张坤勇[1,2] 李俊吉 张弛 李福东 朱诚 ZHANG Kunyong;LI Junji;ZHANG Chi;LI Fudong;ZHU Cheng(Geotechnical Research Institute,Hohai University,Nanjing 210024,China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210024,China;Urban Road Management Center of Nanjing,Nanjing 210000,China;CCCC-SHB Fourth Engineering Co.,Ltd.,Luoyang 471013,China;China Commu-nications Construction Company Limited Rail Transit Division,Beijing 100088,China)

机构地区：[1]河海大学岩土工程科学研究所,江苏南京210024 [2]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210024 [3]南京市城市道路管理中心,江苏南京210000 [4]中交二公局第四工程有限公司,河南洛阳471013 [5]中国交建轨道交通事业部,北京100088

出　　处：《西南交通大学学报》2025年第2期271-281,共11页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金项目(41530637)。

摘　　要：针对城市基坑开挖过程中邻近道路沉降开裂问题,基于Winkler理论,将研究对象从一维结构扩展到二维结构.首先,建立道路在基坑开挖引起沉降场下的计算模型,推导出道路挠曲变形控制方程;其次,采用两阶段分析方法,考虑基坑开挖深度、宽长比、支护刚度以及坑底以上软土层厚度等因素,给出基坑开挖引起沉降场修正公式和地表最大沉降预测方法;接着,将沉降场代入道路挠曲变形控制方程,通过有限差分法求解四阶非线性偏微分方程;最后,通过工程实例对上述关于基坑开挖条件下道路计算分析模型进行验证.现场监测数据与理论解、数值模拟结果比较发现:道路沉降的误差分别为15.0%和8.3%,均在合理范围内,确定本文所提出的基坑开挖条件下道路计算分析模型的可靠性.To address the issue of settlement and cracking of adjacent roads during the excavation of urban foundation pits,the research object was extended from a one-dimensional structure to a two-dimensional structure based on the Winkler theory.Firstly,a calculation model for the settlement field caused by foundation pit excavation was established,and the control equation for road flexural deformation was derived.Secondly,a twostage analysis method was adopted by considering factors of foundation pit excavation depth,aspect ratio,support stiffness,and thickness of soft soil layer above the pit bottom,so as to provide a correction formula for settlement field caused by foundation pit excavation and a method for predicting maximum surface settlement.Thirdly,the settlement field was substituted into the control equation for road flexural deformation,and a fourth-order nonlinear partial differential equation was solved by using the finite difference method.Finally,the above road calculation and analysis model under the condition of foundation pit excavation was verified by an engineering example.By comparing the field monitoring data with the theoretical solution and numerical simulation,it was found that the errors in road settlement were 15%and 8.3%,respectively,both of which are within acceptable limits,thereby confirming the reliability of the road calculation and analysis model proposed in this study under the condition of foundation pit excavation.

关 键 词：基坑开挖 WINKLER地基梁 土与结构相互作用 路面沉降 

分 类 号：TU753[建筑科学—建筑技术科学]