首页|盾构下穿引起上覆管线变形的简化计算方法

盾构下穿引起上覆管线变形的简化计算方法

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  • 国家科技期刊平台
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  • NSTL
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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Paster-nak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。
Simplified Calculated Method for Pipeline Deformation Induced by Shield Tunneling
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.

pipeline-soil interactionPasternak foundationlateral soil effectsimplified calculated method

冯国辉、肖明清、倪建中、郑茗旺、李雨杰、刘冠水、李强、徐长节

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浙江大学 滨海和城市岩土工程研究中心,浙江 杭州 310058

浙大城市学院 土木工程系,浙江 杭州 310015

中铁第四勘察设计院集团有限公司,湖北 武汉 430061

杭州富阳城市建设投资集团有限公司,浙江 杭州 311400

浙江杭海城际铁路有限公司,浙江 嘉兴 314000

轨道交通基础设施性能监测与保障国家重点实验室(华东交通大学),江西 南昌 330013

江西省岩土工程基础设施安全与控制重点实验室(华东交通大学),江西 南昌 330013

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管-土相互作用 Pasternak地基 侧向土体影响 简化计算方法

国家重点研发计划国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家杰出青年科学基金江西省自然科学基金浙江大学平衡建筑研究中心配套资金资助项目南昌轨道交通集团科研项目

2023YFC30094008U19342085223800952008373518782765172580220223BBG7101820203512-10C2019HGKYB002

2024

10.16339/j.cnki.hdxbzkb.2024048

湖南大学学报(自然科学版)
湖南大学

湖南大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.651
ISSN：1674-2974
年,卷(期)：2024.51(5)
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