文献类型：期刊文献

中文题名：埋地管线下方土体流失对管线受力变形的影响研究

英文题名：Influence of soil loss beneath buried pipelines on force and deformation of pipelines

作者：梁渭溪[1];雍睿[1];李朝旺[1]

机构：[1]绍兴文理学院土木工程系,浙江绍兴312000

年份：2021

卷号：52

期号：8

起止页码：186

中文期刊名：人民长江

外文期刊名：Yangtze River

收录：CSTPCD、、Scopus、北大核心、北大核心2020

基金：国家自然科学基金项目(41502300,41427802);浙江省自然科学基金项目(LQ16D020001)。

语种：中文

中文关键词：埋地管线;受力变形;管-土耦合模型;角点法;Winkler弹性地基梁理论

外文关键词：underground pipelines;stress and deformation;pipe-soil coupling model;Boussinesq's point load solution;Winkler-based elastic foundation beam

中文摘要：埋地管线长期使用中会发生渗漏、管周土体不均匀沉降等问题,使得管线受力平衡状态被打破,在土体自重荷载和地表荷载的共同作用下容易引起邻近管线的破坏。为了分析管线的受力和变形,采用角点法和Winkler弹性地基梁理论,构建管-土耦合模型,推导出管线的受力变形方程。基于ABAQUS有限元软件模拟管-土耦合模型,对比分析数值模拟和理论计算的结果,以验证管线受力变形方程的有效性。结果表明:①基于Winkler弹性地基梁理论的管-土耦合作用模型可以求得有效的管线受力变形方程,其理论解与数值模拟解相差仅为3.31%~3.43%。②在地表荷载作用下,沿远离土体流失区中心方向,位移逐渐变小,剪力逐渐增大,且在土体流失区边缘附近达到峰值后慢慢减小,出现反弯剪力最后趋于零,而弯矩逐渐增大达到峰值后慢慢减小。③当无地表荷载作用时,管线的受力变形比有地表荷载作用时小17.32%~20.77%。所提出的管线受力变形方程能够正确反映上覆荷载作用下管线受力的基本特征,可为工程中管线受力变化控制提供参考依据。

外文摘要：During the service life of pipelines,problems such as leakage and uneven settlement in the surrounding soil can threat the structural integrity of underground pipelines.The stress state of the pipeline is hence disturbed,leading to increased possibility of pipeline damage due to the combined action of overburden and surface loading.In order to analyze the force and deformation of pipelines,the superposition method of Boussinesq's point load solution and the Winkler-based elastic foundation beam theory were used to construct a pipe-soil coupling model,and the force and deformation equations of the pipeline were derived.Additionally,the pipe-soil coupling model was simulated based on ABAQUS finite element software,and the results of numerical simulation and theoretical calculation were compared and analyzed to verify the effectiveness of the derived force and deformation equations.The results showed that:①the Winkler elastic foundation beam theory based pipe-soil coupling model could effectively deduce force and deformation equations for pipelines,and the difference between theoretical and numerical simulation results was only 3.31%~3.43%.②Under the action of surface loading,the displacement decreased gradually along the pipe axis away from the soil loss zone;while the shear force increased gradually until it reached the peak at the edge of the soil loss zone.After a reverse bending shear force appeared,it decreased slowly to zero at far ends,and the bending moment decreased slowly after reaching the peak value.③When there is no surface load,the mechanical response of pipeline is 17.3%~20.77%less than that when the surface load is applied.The comparison between numerical and analytical solutions demonstrates that the proposed method can correctly describe the characteristics of pipeline behavior under surface loading subjected to ground loss,which can provide design guidance for optimization of pipeline parameters.