跨断层隔震管道管端与土体相互作用分析

断层错动是造成埋地管道破坏的重要因素之一,因此,跨断层埋地管道在断层错动下的破坏机制、模型设计与参数分析和管道抗断层措施一直是生命线工程的前沿问题。对跨断层管道内力分析取得的成果较多,比较经典的是Newm ark-Hall方法、Kennedy方法和王汝梁方法,后来又出现基于壳模型的有限元分析方法。现有的管道抗断层措施具有其优点的同时亦有其不足。本文基于壳模型的有限元动力数值模拟,对一种管道跨断层隔震措施进一步研究,考虑管端与土体相互作用计算隔震管段的断层错动响应。计算结果表明拉应变容易在土中的管段传递,相比较而言,压应变不容易在土中的管段传递;最大拉应变降低比较多,最大压应变降低比较少。根据分析结果,对跨断层隔震管段边界条件的选取提出建议。

Soil-pope end interaction analysis for seismic isolation pipelines crossing fault

Fault movement is an important reason causing the damage to buried pipelines.Damage mechanism,model designing,parameter analysis,and fault-resistant measures for pipeline crossing fault are the hot spot of lifeline engineering.Development in response analysis for buried pipelines crossing fault has been promoted,for example,Newmark method,Kennedy method,Wang R L method and subsequent FEM based on shell model.Using the dynamic finite element numerical simulation of shell model and considering the interaction of pipeline end with soil,basic research of a fault resistant measure for pipeline crossing fault is conducted.The result shows that the tensile strain propagates easily along the pipe,but the compressive strain can't do so.The tensile strain decreases more,but the compressive strain decrease less.Based on the analysis result,the boundary conditions are suggested.