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研究目的:中俄输油管道穿越我国东北大兴安岭多年冻土区,多年冻土的融沉及活动层的冻融对管道地基工程的破坏,将造成管基的不均匀变形,影响输油管道的安全。本文通过对中俄输油管道沿线多年冻土区工程地质问题进行分析研究,有针对性地提出用以保证输油管道工程安全稳定的防治对策。研究结论:(1)在多年冻土区采用架空方式敷设输油管道,可极大地避免不良工程地质问题对输油管道安全的影响;(2)冻融差异变形是导致冻土地区管道变形破坏以及诱发管道病害的主要原因,通过减小冻胀变形或融沉变形的绝对值来减缓管道在纵向方向差异变形上的剧烈程度均是输油管道克服变形破坏的有效途径;(3)在冻胀敏感性土和高含冰量多年冻土等不良工程地质地段,可采用管道保温、换填、管壁加厚等措施来消除或减弱管道轴向不均匀变形程度。
Research purposes: The Sino-Russia oil pipeline crosses the permafrost zone in the Daxinganling Mountains in northeast China. The thawing of the permafrost and the freezing and thawing of the active layer on the pipeline foundation engineering will result in the uneven deformation of the pipe foundation and the safety of the oil pipeline. This paper analyzes the engineering geological problems in the permafrost regions along the Sino-Russia oil pipeline and puts forward some countermeasures to ensure the safety and stability of the oil pipeline project. Research conclusions: (1) The overhead pipeline laying in oil and gas pipelines in permafrost regions can greatly avoid the impact of poor engineering geological issues on the safety of oil pipelines. (2) The differential deformation caused by freeze-thaw cycles is the cause of pipe deformation and damage induced in permafrost regions The main reason of pipeline disease is to reduce the drastic degree of pipeline deformation in the longitudinal direction by reducing the absolute value of frost heave deformation or thaw settlement deformation. (3) In the frost heaving sensitivity Soil and ice-rich permafrost and other poor engineering geological sections, the pipe insulation, replacement, wall thickening and other measures to eliminate or reduce the degree of uneven axial pipe deformation.