摘要
基于盾构开挖侧穿邻近桩基引起桩-土相互作用的实际工况,提出了一种可预测桩基水平变形的简化计算方法.采用两阶段法获得盾构开挖引起邻近桩基水平位移简化计算方法,第一阶段采用Loganathan公式计算盾构开挖引起邻近桩基轴线处土体自由水平位移场;第二阶段把桩基简化成Euler-Bernoulli梁放置在Vlasov地基模型上,建立桩基水平位移控制方程,结合桩基两端约束情况,采用差分法获得邻近桩基的水平位移矩阵解.随后考虑群桩之间的土体遮拦效应,进一步获得邻近群桩的水平变形差分解.通过与两个既有工程案例实测以及既有地基模型计算结果对比,验证了本文方法的优越性.群桩参数分析表明:地层损失率及隧道埋深的增大均会引起邻近群桩水平位移的增大,但桩身产生最大位移处会随着隧道埋深增加而增大;桩隧之间间距的增大会引起邻近群桩水平位移的减小,但其减小速率逐渐变缓.
Based on practice engineering of pile-soil interaction induced by side-crossing tunneling,a simpli⁃fied calculation method is proposed to evaluate the lateral displacement of the existing pile.The two-stage method is selected to get a simplified calculation method of the horizontal displacement of adjacent piles caused by shield tun⁃neling.In the first stage,the Loganathan formula is applied to calculate the horizontal soil-free displacement at the pile axis caused by shield tunneling.In the second stage,the pile is simplified as an Euler-Bernoulli beam lying on the Vlasov foundation model,then the governing equation of horizontal displacement of the pile is established.After considering the boundary of the pile,the analysis of the mathematical matrix of tunneling on the adjacent pile is ob⁃tained by using a finite different method.Next,taking the soil blocking effect between pile groups into consideration,further,the difference solution for horizontal displacement of adjacent pile groups can be detected.By comparing with actual measurement in two engineering cases,the superiority of the proposed method can be verified.The param⁃eters analysis of group piles shows that the horizontal displacement of adjacent pile groups increases with the incre⁃ment of tunnel buried depth and ground loss ratio,but the depth of maximum displacement occurrences increases with the increase of the buried depth of the tunnel.The increase of the tunnel-pile horizontal distance causes the de⁃crease of the horizontal displacement of the adjacent pile groups,but the rate of decrease slows gradually.
作者
冯国辉
窦炳珺
黄展军
丁士龙
侯世磊
胡安峰
徐长节
FENG Guohui;DOU Bingjun;HUANG Zhanjun;DING Shilong;HOU Shilei;HU Anfeng;XU Changjie(Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China;Center for Balance Architecture,Zhejiang University,Hangzhou 310028,China;Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering,East China Jiaotong University,Nanchang 330013,China;Zhejiang Dacheng Construction Group Co,Ltd,Hangzhou 310012,China;Nanchang Rail Transit Group Co,Ltd,Nanchang 330013,China;China Railway 14th Bureau Group 4th Engineering Co,Ltd,Jinan 250002,China;Engineering Research&Development Centre for Underground Technology of Jiangxi Province,Nanchang 330013,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第9期136-144,共9页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金-高铁联合基金资助项目(U1934208)
国家杰出青年基金资助项目(51725802)
国家自然科学基金资助项目(51878276)
浙江省自然科学基金委员会-华东院联合基金资助项目(LHZ19E080001)。
