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Title:: Study on the Selection of Soil Calculation Area in Numerical Simulation of the Buried Pipeline

作者:: 刘鹏¹; 2; 陈洪富¹; 2; 孙柏涛¹; 2; (1.中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨 150080; 2.地震灾害防治应急管理部重点实验室,黑龙江哈尔滨 150080)

Author(s):: LIU Peng¹; 2; CHEN Hongfu¹; 2; SUN Baitao¹; 2; (1.Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,Heilongjiang,China)(2.Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,Heilongjiang,China)

Keywords:: buried pipeline; infinite element; boundary condition; finite element analysis; pipe-soil interaction

摘要:: 详细论述了动力无限元基本理论,提出了一种在非一致激励时无限元边界面上地震动的输入方法。在此基础上,考虑管线-土体之间的黏结滑移效应,采用动力无限元边界,建立了埋地管线的三维有限元-无限元耦合的精细化模型,对非一致地震波激励下埋地管线的动力响应进行了数值分析,对管线周围的土体计算范围的取值进行了系统研究,给出了管线周围土体的有效计算宽度W、有效计算长度L和有效计算深度H的取值范围。结果表明:W的取值与管径D紧密相关,H可取30～60 m,L应至少包含一个地震动的卓越周期段的波长,此分析结果可满足大多数工程需求。

Abstract:: In this paper,the basic theory of dynamic infinite element is discussed,and an input method for ground motion at the boundary surface of the infinite element by non-uniform excitation is proposed.Then,on condition that the bond slip effect between pipelines and soil is involved,a refined model of buried pipelines,which couples three-dimensional finite element with infinite element,is established by using dynamic infinite element boundaries.The dynamic response of buried pipelines by the non-uniform seismic wave excitation is numerically analyzed.The values of the calculation range of the soil around the pipeline are systematically studied,and the effective width W,the effective length L,and the effective depth H of the soil around the pipeline are given.The results indicate that the value of W is closely related to the pipe diameter D; H can be taken between 30-60 m,and L should include at least one wavelength of the predominant period of the ground motion.In this case,the results can meet most engineering requirements.