连续埋地管线沉陷情况下可靠度分析

摘要

The uneven settlement is one of the important factors which lead to the damage of the buried pipeline.The means first-order second-moment method and Monte-Carlo method in ANSYS are used to calculate the reliability of the buried pipeline considering the random variables,i.e.,displacement of ground settlement,material parameters and internal pressure.Reliability coefficients and failure probabilities considering or without considering the internal pressure are obtained.The results obtained by reliability analysis show that the variability of settlement displacement has important impact on the reliability of the buried pipeline subjected to the settlement.Compared with the results which do not consider internal pressure,the failure probability which considers internal pressure is larger and the reliability coefficient is smaller.It is also found that the variability of pipe diameter and thickness has important impact on the reliability of the buried pipeline.%场地的不均匀沉陷是埋地管线破坏的重要原因之一.运用均值一次二阶矩法和ANSYS中的蒙特卡罗法对埋地管线在地面沉陷位移、材料性能参数、内水压力等随机变量下的可靠度进行计算分析,得到考虑和不考虑管道内水压力时的可靠度系数和失效概率.结果表明,地面沉陷位移的变异性对沉陷区埋地管线的可靠度有着十分重要的影响,与不考虑管道内水压力作用的结果相比,考虑管道内水压力时的失效概率较大,可靠度系数较小;管道壁厚和直径的变异性对沉陷区埋地管线的可靠度也存在着不可忽视的影响.