基于钢筋应力监测值的盾构隧道管片外部荷载正交数值反演分析方法  

Orthogonal Numerical Back-analysis Method of Shield Tunnel Segment External Load Based on Reinforcement Stress Monitoring Value

作　　者：米保伟 张强 王术明 MI Baowei;ZHANG Qiang;WANG Shuming(AGILETECH Engineering Consulations Co.,Ltd.,100050,Beijing,China)

机构地区：[1]北京安捷工程咨询有限公司,北京100050 [2]城市轨道交通绿色与安全建造技术国家工程实验室,北京100037 [3]北京城建设计发展集团股份有限公司西安分公司,西安710016

出　　处：《城市轨道交通研究》2023年第5期145-150,共6页Urban Mass Transit

摘　　要：为研究盾构隧道管片外部荷载的分布特征,提出了一种基于钢筋应力监测值的管片外部荷载正交数值反演分析方法。以钢筋应力监测值为目标函数,该方法通过建立正交数值分析工况较好地反演了管片的外部荷载。研究表明:(1)该方法通过分析所提取的管片外部荷载试验因素,设置相应的试验因素水平,建立正交试验分析工况;基于三维有限元反演分析模型进行迭代计算,求解基于钢筋应力的监测值和计算值的目标函数,通过其均值和极差分析反演获得管片外部荷载最优解。(2)管片外部荷载影响因素包括竖向土压力修正系数、水压力修正系数、侧压力系数和地层抗力系数。(3)三维有限元反演分析模型建模要素包括三维实体管片和一维钢筋,管片接缝采用一维螺栓+二维界面进行模拟,地层采用仅受压曲面弹簧进行模拟。(4)算例最优解为竖向土压力修正系数为1.2、水压力修正系数为1.2、地层抗力系数为70 MPa/m、侧压力系数为0.35。To explore the distribution characteristics of the shield tunnel segment external load,an orthogonal numerical back-analysis method of segment external load based on reinforcement stress monitoring value is proposed.Taking reinforcement stress monitoring value as the objective function,the proposed method can well retrieve the segment external load by establishing orthogonal numerical analysis working conditions.The study shows that:(1)through analyzing the segment external load test factors,the proposed method sets the corresponding test factor levels and establishes orthogonal test analysis working conditions;based on 3D finite element back-analysis model,iterative calculation is carried out to solve the target function based on reinforcement stress monitoring value and calculation value,the segment external load optimal solution is obtained through the mean and extreme difference analysis.(2)The segment external load test factors include vertical soil pressure correction coefficient,water pressure correction coefficient,side pressure coefficient,and formation elastic resistance coefficient.(3)The modeling elements of 3D finite element back-analysis model include 3D solid segments and 1D rebar,segment joints are simulated using 1D bolt+2D interface,and the ground layer is simulated using the only compressed surface spring.(4)The example optimal solution is vertical soil pressure correction coefficient of 1.2,water pressure correction coefficient of 1.2,formation elastic resistance coefficient of 70 MPa/m and side pressure coefficient of 0.35.

关 键 词：盾构隧道 钢筋应力监测 管片外部荷载 正交数值反演分析 

分 类 号：U455.43[建筑科学—桥梁与隧道工程] U451.1[交通运输工程—道路与铁道工程]