冻土区输油管道工程基础稳定性研究

Stability of Engineering Foundations of Oil Pipelines in Permafrost Regions:A Review

寒区管道基础设计和施工必须考虑沿线的地形和环境条件对冻胀和融沉,以及相应的管道工程基础和结构整体性的影响。输油管道工程需要充足的科研投入、论证及决策时间。在此基础上,采用一系列创新设计来保护(或预先融化)冻土,抑制融沉。这些研究围绕的关键问题是温热及环境温度油管在多年和季节冻土中的水热效应、差异性冻胀及融沉所导致的管道变形破坏。这些研究对可能出现的问题进行及早发现、充分理解、正确预测以及最终合理的设计、施工和维护至关重要。

Foundation engineering and technology of oil pipelines in permafrost regions have been continuously driven by oil explorations and economic development into further north. However, many challenges still exist. Design and construction of pipeline foundations in cold regions have to be modified for the impacts of topography and environments on frost heaving and thaw settlement of ambient soils along the pipelines,as well as the resultant impacts on the integrity and stability of pipeline foundations. Sufficient, detailed research has to be invested, and adequate time should be allowed for debating and decision-making processes before the construction. Based on extensive and intensive geotechnical studies associated with design, construction and operations of pipelines,a variety of creative and innovative designs and construction modes can be applied for protecting (or pre-thawing) permafrost to economically minimize frost heaving and thaw settlement to acceptable levels. These research projects are focused on thermal (temperature) and hydro-logical effects, differential frost heaving and thaw settlement of permafrost and seasonally frozen ground that might be caused by the construction activities and the existence of hot/warm and ambient-temperature oil pipelines, and potential deformations and failures of pipelines. These studies are critical for timely detection,adequate understanding,and correct prediction of possible permafrost geotechnical problems and ultimate logical design,construction and operations of pipelines.