摘要
基于盾构下穿引起既有隧道变形的工况,提出了一种可预测上覆隧道变形响应的解析方法.采用修正Peck公式求解盾构开挖引起周边土体变形的土体自由位移,将土体自由位移转化成附加应力施加于既有隧道上,将既有隧道简化成无限长Euler-Bernoulli梁搁置在Kerr地基模型上,引入隧道轴向内力的影响,结合隧道两端的边界条件获得既有隧道受力变形响应.结果表明:所提方法的计算结果更接近工程实测数据;与Kerr地基模型和Pasternak地基模型计算结果相比,所提解析更具优越性;新旧隧道夹角的增大会引起既有隧道位移及其内力减小;既有隧道轴向内力会引起既有隧道变形计算峰值减小6.1%;既有隧道位移及内力会随着地层损失率的增大而线性增大.
Based on the working condition of existing tunnel deformation induced by tunneling underlying,an analytical solution was proposed for predicting the deformation response of the overlying tunnel.The modified Peck formula was used to solve the free displacement of the surrounding soil caused by shield excavation.The free displacement of the soil was converted into an additional stress applied to the existing tunnel.The existing tunnel was simplified as Euler-Bernoulli beam lying on the Kerr foundation model.With the influence of the axial force of the existing tunnel,the deformation analytical solution of the existing tunnel was solved by considering the boundary conditions at the ends of the existing tunnel.The results show that the solutions given by the proposed method are close to the measured data.Compared with the calculation results of the Kerr foundation model and the Pasternak foundation model,the prediction of the proposed method has more superiority.The displacement and the internal force of the existing tunnel decrease with the increase of the angle between the new tunnel and the old one.The axial internal force of the existing tunnel causes the calculated deformation peak value of the existing tunnel to decrease by 6.1%.Both the deformation and the inner force of the existing tunnel increase linearly with the increase of the volume loss rate.
作者
冯国辉
徐长节
郑茗旺
李欣雨
迟民良
侯世磊
Feng Guohui;Xu Changjie;Tey Mingwang;Li Xinyu;Chi Minliang;Hou Shilei(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;China Railway 14th Bureau Group 4th Engineering Co.,Ltd.,Jinan 250002,China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第3期523-529,共7页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(U1934208,51878276)
国家杰出青年基金资助项目(51725802)
浙江省自然科学基金资助项目(LHZ19E080001)、江西省自然科学基金资助项目(20192ACB20001)
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资助项目(2019HGKYB002).
