摘要
盾构开挖易引起上覆地表沉降变形,进一步会引起上覆既有管线的受力变形响应.基于此,提出了一种盾构开挖引起上覆管线变形的简化计算方法.首先采用Loganathan公式获得既有管线在盾构下穿影响下的附加应力,进一步将管线简化成无限长梁放置在Pasternak地基上,引入无限远端侧向土体位移对既有管线的影响,采用力学平衡法获得管线竖向受力变形控制方程,通过有限差分法获得管线变形及其内力数值解析.案例分析表明:与退化解析对比,该方法计算结果更贴近既有文献工程实测数据,验证了其可靠性.进一步参数研究表明:增大隧道与管线的竖向净距会引起既有管线受力变形的非线性减小;管线变形及其内力会随着地层损失率增大而线性增大;管线抗弯刚度的增大会引起管线变形减小,但会大幅增加管线弯矩.
Tunnel excavation can easily cause settlement and deformation of the surface of the overlying surface,which will further cause the stress and deformation response of the existing pipeline.Based on this,a simplified method for calculating the deformation of the overlying pipeline due to shield excavation is proposed.Firstly,the Loganathan formula is selected to solve the additional stress along the pipeline induced by tunneling underlying,and the pipeline is further simplified into an infinitely long beam resting on the Pasternak foundation.The influence of the lateral displacement of the infinite distal soil on the existing pipeline is introduced.Then,the mechanical equilibrium method is used to obtain the control equation of the vertical force and deformation of the pipeline.The finite difference method is selected to obtain the numerical analytical solution of the pipeline deformation and internal force analysis.The case analysis shows that,compared with the degradation analysis of this method,the calculation results are closer to the measured data of an actual project in the existing literature,which verifies the reliability of this method.Further parameter studies show that increasing the vertical clearance between the tunnel and the pipeline causes a nonlinear reduction in the stress and deformation of the pipeline.Increasing the volume loss rate results in a linear increase in the deformation and inner force of the pipeline.Increasing the pipeline bending stiffness reduces the pipeline deformation but greatly increases the pipeline bending moment.
作者
冯国辉
肖明清
倪建中
郑茗旺
李雨杰
刘冠水
李强
徐长节
FENG Guohui;XIAO Mingqing;NI Jianzhong;TEY Mingwang;LI Yujie;LIU Guanshui;LI Qiang;XU Changjie(Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China;Department of Civil Engineering,Hangzhou City University,Hangzhou 310015,China;China Railway Siyuan Survey and Design Group Co.Ltd.,Wuhan 430061,China;Hangzhou Fuyang City Construction Investment Group Co.Ltd.,Hangzhou 311400,China;Zhejiang Hanghai Intercity Railway Co.Ltd.,Jiaxing 314000,China;State Key Laboratory of Performance Monitoring Protecting of Rail Transit Infrastructure(East China Jiaotong University),Nanchang 330013,China;Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering(East China Jiaotong University),Nanchang 330013,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2024年第5期68-75,共8页
Journal of Hunan University:Natural Sciences
基金
国家重点研发计划资助项目(2023YFC30094008)
国家自然科学基金资助项目(U1934208,52238009,52008373,51878276)
国家杰出青年科学基金资助项目(51725802)
江西省自然科学基金资助项目(20223BBG71018)
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)。
