基于Kerr地基模型单井降水邻近管线变形计算方法  

Calculation method of pipeline deformation adjacent to single well dewateringbased on the Kerr foundation model

作　　者：管凌霄 徐长节[1,2,3,4] 可文海 冯国辉 夏雪勤 孙洋 GUAN Lingxiao;XU Changjie;KE Wenhai;FENG Guohui;XIA Xueqin;SUN Yang(State Key Laboratory of Performance Monitoring Protecting of Rail Transit Infrastructure(East China Jiaotong University),Nanchang 330013,China;Engineering Research&Development Centre for Underground Technology of Jiangxi Province(East China Jiaotong University),Nanchang 330013,China;Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering(East China Jiaotong University),Nanchang 330013,China;Research Center of Coastal and Urban Geotechnical Engineering(Zhejiang University),Hangzhou 310058,China;Jiangxi Transportation Institute Co.,Ltd.,Nanchang 330013,China)

机构地区：[1]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),南昌330013 [2]江西省地下空间技术开发工程研究中心(华东交通大学),南昌330013 [3]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),南昌330013 [4]滨海和城市岩土工程研究中心(浙江大学),杭州310058 [5]江西省交通科学研究院有限公司,南昌330013

出　　处：《哈尔滨工业大学学报》2023年第11期107-114,共8页Journal of Harbin Institute of Technology

基　　金：国家杰出青年科学基金(51725802);国家自然科学基金(52108321,52238009);江西省自然科学基金-揭榜挂帅项目(20223BBG71018);江西省研究生创新资金(YC2022-B175)。

摘　　要：为了研究单井降水对邻近管线的影响,基于Kerr地基模型结合两阶段法提出了一种单井降水引起邻近管线竖向变形的计算方法。在第一阶段采用有效应力原理与Dupuit假定计算出降水引起邻近管线受到的附加应力,第二阶段将管线视作搁置在三参数Kerr地基上Euler-Bernoulli梁,以此模拟管线与土的相互作用进而推导出管线的竖向位移。通过与原位降水试验及Winkler模型的结果进行对比,验证了所提方法的准确性,并进一步分析了土体弹性模量、渗透系数、管-井间距以及水位降深变化对管线竖向位移的影响。分析结果表明:所采用的Kerr地基模型考虑了土体变形的连续性,相比Winkler地基模型更具优越性;土体渗透系数及管-井间距对管线变形影响较小,而土体弹性模量与降水井内水位降深影响较大;土体弹性模量减小、水位降深增大均导致管线变形明显增大,且易引起管线位移超过允许值,应针对相应因素采取防控措施。To investigate the impact of single well precipitation on nearby pipelines,a calculation method of vertical displacement of adjacent pipeline caused by single well dewatering is proposed based on the Kerr foundation model and the two-stage method.In the first stage,the effective stress principle and Dupuit assumption are used to calculate the additional stress caused by dewatering in the adjacent pipeline.In the second stage,the pipeline is regarded as an Euler-Bernoulli beam resting on the three-parameter Kerr foundation to simulate the interaction between the pipeline and the soil and deduce the vertical displacement of the pipeline.The correctness of the proposed method is verified by comparing it with the results of the Winkler foundation model and the in-situ pumping test.The influences of the elastic modulus of soil,permeability coefficient,pipeline-well spacing,and water level drop depth on the vertical displacement of the pipeline are further analyzed.The analysis results show that the Kerr foundation model adopted in this paper considers the continuity of soil deformation and has more advantages than the Winkler foundation model.Soil permeability coefficient and pipeline-well spacing have little effect on pipeline deformation.However,the soil elastic modulus and the water level drop depth have a significant effect.The decrease of soil elastic modulus and the increase of water level decrease both lead to the apparent increase of pipeline deformation and easily cause pipeline displacement to exceed the allowable value.Therefore,prevention and control measures should be taken according to the corresponding factors.

关 键 词：单井降水 既有管线 有效应力原理 两阶段法 Kerr地基 

分 类 号：TU93[建筑科学—结构工程]