中俄原油管道漠大线冻土稳定性评价

Evaluation of Permafrost Stability along Mohe-Daqing Line of China-Russia Crude Oil Pipeline

中俄原油管道工程北起我国漠河,南到大庆,管道工程穿越大兴安岭多年冻土区和南部松嫩平原的季节冻土区。管道沿线冻土属于高温、高含冰冻土,土体稳定性差,对管道的灾害性评价具有一定的必要性。该文选取管道沿线松岭、加格达奇和喇嘛甸3个冻土区,将自然环境、冻土状况及管道扰动因素作为评价指标,运用可变模糊集对立统一定理的评价方法,进行多年冻土及季节冻土冻害破坏的稳定性评价。通过分析评价,松岭区为大片融区多年冻土,评价的计算值为3.41,属于Ⅲ级冻土,稳定性为不良;加格达奇为岛状多年冻土,计算结果为2.468,为Ⅱ级冻土,稳定性较好;喇嘛甸是管道沿线季节冻土区,土体受盐渍灾害影响,评价值为3.254,等级为Ⅲ级,为不良冻土。

The China-Russia crude oil pipeline project starts from Mohe in the north to Daqing in the south, and passes through the permafrost region of Daxing’an Mountains and the seasonal permafrost region of Songnen Plain in the south. The permafrost along the pipeline belongs to high temperature and high content permafrost, and the soil stability is poor, so it is necessary to evaluate the disaster of the pipeline. In this paper, three permafrost regions along the pipeline, Songling, Jiagedaqi and Lamadian, are selected, the natural environment, permafrost condition and pipeline disturbance factors are taken as evaluation indexes, and the evaluation method of variable fuzzy set unity of opposites theorem is used to evaluate the stability of permafrost and seasonal permafrost damage. Through analysis and evaluation, Songling District is a large area of permafrost with a calculated value of 3.41, which belongs to grade III permafrost with poor stability, while Jiagdachi is an island permafrost with a calculation result of 2.468, which belongs to grade II permafrost with good stability. Lamadian is a seasonal permafrost area along the pipeline, and the soil is affected by salinization disasters, with an evaluation value of 3.254 and grade III, which is bad permafrost.