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考虑管土分离的基坑开挖引起邻近地下管线位移分析
何小龙1, 杨天鸿1, 周云伟1, 梁禄钜2, 徐长节2,3,4
1.杭州市钱江新城建设开发有限公司, 杭州 310058;2.浙江大学 滨海和城市岩土工程研究中心, 杭州 310058;3.华东交通大学 土木建筑学院;4.江西省岩土工程基础设施安全与控制重点实验室, 南昌 330013
摘要:
在城市建设中,深基坑开挖会对邻近既有地下管线产生较大威胁。目前,基于有限元数值模拟和传统弹性地基梁模型分析方法无法考虑由于管线与土体之间刚度和变形的差异性而造成的管土相互分离现象,使得对于基坑开挖引起管线变形的预测偏于不安全。基于Pasternak弹性地基梁理论,引入管土相互分离计算模型,推导了基坑开挖引起的邻近管线变形计算解析解。参数分析结果表明,管线最大位移随管土分离段长度的增大而增大,且当管线抗弯刚度较小时,土体剪切作用对管线变形影响较大。通过理论计算结果和有限元数值模拟结果及现场实测数据的对比,验证了分析模型的适用性。
关键词:  管土分离  地基模型  位移  刚度  内力
DOI:10.11835/j.issn.2096-6717.2019.117
分类号:TU432
基金项目:国家重点基础研究发展计划(973计划)(2015CB057801);国家杰出青年科学基金(51725802);国家自然科学基金(51878276)
Analysis of pipeline displacement induced by adjoining foundation pit excavation considering pipeline-soil separation
He Xiaolong1, Yang Tianhong1, Zhou Yunwei1, Liang Luju2, Xu Changjie2,3,4
1.Hangzhou CBD Construction Development Co., Ltd, Hangzhou 310058, P. R. China;2.Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, P. R. China;3.School of Civil Engineering and Architecture;4.Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering, East China Jiaotong University, Nanchang 330013, P. R. China
Abstract:
The foundation pit excavation in urban city construction will form a sevious threat to the nearby existing pipeline. Present analytical methods based on FEM numerical simulation and classical elastic foundation beams theories can hardly consider the pipeline-soil separation phenomenon results from the differences of stiffness and deformation between pipeline and soil mass, which will lead to an unsafety prediction of pipeline displacement induced by foundation pit excavation. Based on Pasternak model of elastic foundation beams, an analytical solution of pipeline deformation induced by adjoining foundation pit excavation considering pipeline-soil separation is proposed. Parameter analysis indicates that the maximum displacement of pipeline increases with increase of the length of pipeline-soil separation portion. Moreover, vertical shear stiffness of the soil mass has a significant influence on pipeline deformation when the flexural rigidity of pipeline is small. The analytical model is validated by comparison among analytical calculation results.
Key words:  pipeline-soil separation  foundation model  displacement  stiffness  internal force
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