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钢质埋地管线在不同场地走滑断层下的可靠性研究

DOI: 10.13197/j.eeev.2015.02.215.haoet.027, PP. 215-222

Keywords: 走滑断层,钢质埋地管线,等效边界弹簧,蒙特卡罗法,可靠性

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Abstract:

断层是造成埋地管线破坏的最重要原因.简化埋地管线小变形段为等效边界弹簧,对管材为三折线本构模型的等效边界弹簧本构方程进行了推导.基于ANSYS软件的有限元概率设计系统,考虑了管线外径、壁厚、内压、埋深及走滑断层位错量等随机输入变量,运用蒙特卡罗方法进行了软土、中等土、硬土3种场地走滑断层位错作用下钢质埋地管线的可靠性分析.研究发现管线应变和失效概率随场地硬度提高显著增大,而应力增大不明显;三种场地走滑断层位错作用下,对应变的敏感性从高到底依次为走滑断层位错量、壁厚、埋深、内压.研究完善和丰富了该方面理论,为埋地管线抗震设计提供了一些合理且经济的建议.

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