摘要
采用两阶段法获得盾构掘进引起的邻近群桩水平位移解析解。第一阶段采用LOGANATHAN公式计算得到盾构掘进对周边土体自由水平位移场的影响;第二阶段将桩基简化为放置在Vlasov地基模型上的Euler-Bernoulli梁,将土体水平自由位移场产生的附加应力转化为傅里叶级数荷载并代入Vlasov地基模型控制方程,进而获得单桩水平变形解析解。随后考虑群桩间的土体遮拦效应,得到盾构掘进引起的邻近群桩的水平位移解析。将2个工程案例实测结果以及有限元模拟结果进行对比,验证本文方法的准确性,并针对所得参数进行分析。研究结果表明:随着地层损失率及隧道开挖半径增大,邻近群桩水平位移增大;随着隧道埋深增大,邻近群桩水平位移增大,且桩身产生最大位移的深度会随着隧道埋深增大而增大。
The two-stage method was selected to get analytical solution of the horizontal displacement of adjacent pile groups caused by shield tunneling.In the first stage,LOGANATHAN formula was applied to calculate the influence of horizontal soil-free displacement caused by shield tunnelling.In the second stage,the pile was simplified as Euler-Bernoulli beam on the Vlasov foundation model,then the additional stress caused by soil-free horizontal displacement was converted into Fourier cosine series,and the governing equation of Vlasov foundation model was established.The analytical solution of horizontal displacement of pile was obtained.Next,the soil blocking effect between pile groups was taken into consideration,and the analytical solution for horizontal displacement of adjacent pile groups caused by shield tunneling was obtained.By comparing the calculating result of proposed method with actual measurement result in two engineering cases and finite element simulation results,the correctness of the proposed method was verified.Last,the influence of parameters was furtherly analyzed.The results show that the horizontal displacement of adjacent pile groups increases with the increase of tunnel diameter and ground loss ratio.The increase of the buried depth of the tunnel will also cause the increase of the horizontal displacement of the adjacent pile groups,and the depth where the maximum deflection occurs will increase with the increase of the buried depth of the tunnel.
作者
冯国辉
郑茗旺
窦炳珺
杨天鸿
葛佳佳
徐长节
黄益盘
祝耀东
FENG Guohui;TEY Mingwang;DOU Bingjun;YANG Tianhong;GE Jiajia;XU Changjie;HUANG Yipan;ZHU Yaodong(Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China;Center for Balance Architecture,Zhejiang University,Hangzhou 310028,P.R.China;Zhejiang Dacheng Construction Group Co.Ltd.,Hangzhou 310012,China;Hangzhou CBD Construction Development Co.Ltd.,Hangzhou 310020,China;Zhejiang Hanghai Intercity Railway Co.Ltd.,Jiaxing 314499,China;Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering,East China Jiaotong University,Nanchang 330013,China;State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330013,China;Nanchang Municipal Public Engineering Project Management Co.Ltd.,Nanchang 330000,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第4期1371-1380,共10页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(U1934208,51878276)
国家杰出青年科学基金资助项目(51725802)
浙江省自然科学基金资助项目(LHZ19E080001)
浙江大学平衡建筑研究中心配套资金资助项目(20203512-10C)
南昌轨道交通集团科研项目(2019HGKYB002)。
关键词
盾构隧道
Vlasov地基模型
傅里叶级数
遮拦效应
水平位移解析解
shield tunneling
Vlasov foundation model
Fourier series
blocking effect
analytical solution of horizontal displacement
作者简介
通信作者:徐长节,博士,教授,从事土动力学、基坑工程及隧道工程等研究,E-mail:xucj@zju.edu.cn。
