基于逐工况反演的基坑围护结构变形分析与探讨  

Analysis and discussion on deformation of foundation pit retaining structure based on one⁃by⁃one working condition inversion

作　　者：刘毅 王海啸 王斌 周傲 位伟[5] LIU Yi;WANG Haixiao;WANG Bin;ZHOU Ao;WEI Wei(China Design Group Co.,Ltd.,Nanjing 210014,China;Research and Development Center of Transport Industry of Technologies and Equipments for Intelligent Design,Constructionand Maintenance of Underwater Tunnel,Nanjing 210014,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,ChineseAcademy of Sciences,Wuhan 430071,China;School of Civil Engineering Architecture and Environment,Hubei University of Technology,Wuhan 430068,China;School of Civil and Architecture Engineering,Wuhan University,Wuhan 430072,China)

机构地区：[1]华设设计集团股份有限公司,江苏南京210014 [2]水下隧道智能设计、建造与养护技术与装备交通运输行业研发中心,江苏南京210014 [3]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [4]湖北工业大学土木建筑与环境学院,湖北武汉430068 [5]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2024年第9期1221-1231,共11页Engineering Journal of Wuhan University

基　　金：国家自然科学基金项目(编号:51979270);中国科学院“百人计划”资助项目;江苏省交通工程建设局科技项目(编号:212019YH111205)。

摘　　要：通过有限元模型的代理分析模型计算,形成涵盖围护结构深层水平位移与土体参数的样本库,并基于最小二乘支持向量机(least square support vector machine,LSSVM)的智能反演算法,建立围护结构深层水平位移与土体参数的关系;再通过现场监测数据,对土体参数进行反演修正,形成了随基坑开挖过程的逐工况反演反馈模型,分析了施工开挖步骤对土体参数的影响规律,并结合相应规范取值,探讨了水平抗力系数的取值范围,进而分别通过弹性地基梁法和有限元法,针对围护桩结构的变形进行了分析与预测。结果表明:基于逐工况的反演分析方法可以有效地预测围护结构的变形,对于大型深基坑的安全施工有很好的指导意义。In this study,a sample library covering the deep horizontal displacement of the retaining structure and soil parameters is formed through the proxy analysis model calculation of the finite element model.Based on the intelligent inversion algorithm of least square support vector machine,the relationship between the deep horizontal displacement of the retaining structure and soil parameters is established.On-site monitoring data is then used to retrieve and correct the soil parameters to form a one-by-one working condition inversion feedback model with the excavation process of the foundation pit.The law of the influence of construction and excavation steps on soil parameters is analyzed,and the values are determined according to the corresponding specifications.The study also discusses the value range of the horizontal resistance coefficient,and analyzes and predicts the deformation of the retaining pile structure by elastic foundation beam method and finite element method respectively.The results demonstrate that the inversion analysis method based on case by case can effectively predict the deformation of the retaining structure,and thus has a good guiding significance for the safe construction of large deep foundation pits.

关 键 词：深基坑 参数反演 正交设计 有限元法 弹性地基梁法 

分 类 号：TV551[水利工程—水利水电工程]