冻土退化对格拉管道运行的影响及其防治措施

The Influence of Permafrost Degradation on Golmud-Lhasa Oil Products Pipeline and Prevention Measures

分析了青藏高原冻土地温的变化规律,指出随着青藏高原气候变暖致使格拉管道沿线冻土退化加剧,多数管段的埋设位置已不再是含水量小、冻胀和融沉敏感性较小的"弱冻胀层"。针对格拉管道途经区域冻土承载能力下降,管道融化下沉加剧,季节融化层加厚,冻胀量和冻胀力增大等不稳定因素,提出应加强管道沿线的地质勘查和冻土区域管段的泄漏监测,建立并实施定期清管及巡线制等相应的防治措施。

The paper analyzes changing rules of ground temperature in Qinghai-Tiebet Plateau permafrost regions and points out that along with serious permafrost degradation over Golmud-Lhasa Oil Product Pipeline due to the warm-up climate of Qinghai-Tiebet Plateau, the location in burying depth for most pipeline segments are no longer the 'weak freezing layer' with small water content,and less sensitive in freezing and thawing. Aiming at the unstable factors that carrying capacity of permafrost falls, pipeline sinking grows, seasonal thawing layer incrassates, and frost amount and frost force increase, the paper brings forward corresponding preventive measures to make geological survey over the pipeline and conduct leaking inspection to the pipeline segments in permafrost regions, and establish and carry out regular pigging and patrolling.