老红坡区易滑坡段天然气管道应力分析

Gas Pipeline Stress-Analysis of Landslides-Prone Section in Laohongpo Area

摘要: 云南省滑坡地质灾害频发，对燃气管道安全运营造成较大危害。为明确滑坡地质灾害对实际天然气埋地管道的危害，本文针对实际老红坡区中缅天然气管道易滑坡地段开展了全线应力分析。研究发现，管道轴向应力和弯曲应力较大的节点均出现在弯管处，且弯管处是复杂应力的集中点；通过增加管道壁厚和降低覆土密度，能够有效避免特定滑坡地质灾害产生时管线应力超载的发生。滑坡地质灾害时天然气管道危险点的确定及管线应力超载的有效避免，能够减少滑坡时天然气管道事故的发生，对管道运营过程中优选监测目标及采取有效措施保障全线安全运营至关重要。

Abstract: The frequent occurrence of landslides and geological disasters has caused serious damage to the safety of gas pipelines in Yunnan Province. In order to clarify the hazards of landslides geological, this paper conducts a full-simulation of stress analysis for the actual landslides-prone section in the actual Laohongpo area of the Sino-Myanmar natural gas pipeline. It turns out that the nodes with larger axial stress and bending stress appear at the elbow, and the elbow is a concentrated point of complex stress. By increasing the wall thickness of the pipeline and reducing the density of the overlying soil, it is possible to effectively avoid the occurrence of stress overload for the pipeline when a specific landslides geological disaster occurs. The determination of landslides geological hazards that break natural gas pipelines and the effective avoidance of pipeline stress overload could reduce the occurrence of the accidents during landslides. It is of great significance to select the monitoring targets during pipeline operation and take effective measures to ensure the safety of the entire line.