积雪对多年冻土区埋地管道周围温度场影响的数值模型研究  

Numerical model study on influences of snow cover on the temperature field around a buried pipeline in permafrost region

作　　者：张珏 金晓颖 黄帅 王宏伟[1,3] 王文辉 周刚义 车富强 李国玉 金会军 ZHANG Jue;JIN Xiaoying;HUANG Shuai;WANG Hongwei;WANG Wenhui;ZHOU Gangyi;CHE Fuqiang;LI Guoyu;JIN Huijun(School of Civil Engineering and Transportation/Permafrost Institute,Northeast Forestry University,Harbin 150040,China;School of Ecology,Northeast Forestry University,Harbin 150040,China;Gansu Province Laboratory of Remote Sensing,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;Key Forest Resources Monitoring Center in National Forest Areas,National Forestry and Grassland Administration,Jagdaqi 165100,Heilongjiang,China;Key Laboratory of Cryospheric Science and Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]东北林业大学土木与交通学院/冻土研究所,黑龙江哈尔滨150040 [2]东北林业大学生态学院,黑龙江哈尔滨150040 [3]中国科学院西北生态环境资源研究院甘肃省遥感重点实验室,甘肃兰州730000 [4]国家林业和草原局重点国有林区森林资源监测中心,黑龙江加格达奇165100 [5]中国科学院西北生态环境资源研究院冰冻圈科学与冻土工程重点实验室,甘肃兰州730000

出　　处：《冰川冻土》2024年第5期1565-1578,共14页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(42101119,U20A2082,41871052);冻土工程国家重点实验室开放基金课题(SKLFSE201913)资助。

摘　　要：积雪对下伏活动层、融区和多年冻土管基的水热和水文状态影响很大,同时对其力学性质和冻融灾害的发展变化也可产生重要影响。本文以中俄原油管道基础为研究对象,建立了随积雪深度动态变化时,在管道运行和有冰水相变条件下的埋地管道与周围管基土热相互作用的数值模型。研究结果表明,同一区域不同上边界条件对冻土温度场影响差异较大,尤其是当上边界条件中考虑实际的积雪影响时,会极大地影响管基土温度场的分布和活动层厚度。在30年管道运行影响下,地表有雪和无雪条件下的最大融化深度分别达到6.32 m和5.39 m,并且冬季积雪的存在导致土体温度上升,加剧了管基土的融化,导致管道正下方融化层不断增厚;有雪条件下地表0.05 m和1.00 m埋深处每次达到的地温最小值比无雪条件下高4.5℃和2.4℃左右,每年达到地温最小值时间也比无雪条件延缓10 d左右。因此,建议在管道设计和维运时充分考虑积雪对管基土的影响,采取相应管护措施,减小管道和积雪共同作用时对管周土体的影响。Snow cover has great impacts on the hydrothermal and hydrological states of the underlying active lay⁃er,talik and permafrost foundation soils,as well as their mechanical properties and frost hazards.In this paper,by taking into account of the thermal interactions between the buried pipeline and the ambient environment under the dual action of multiple ground freeze-thaw cycles and dynamically changing upper boundary conditions,a coupled numerical hydrothermal model of the buried pipeline and the surrounding pipeline foundation soil is es⁃tablished and applied for predicting the distribution and changes of temperature fields of foundation soils of the China-Russia Crude Oil Pipeline I from Mohe to Daqing,Heilongjiang Province,China.The results show that different upper boundary conditions in the same area have great influences on the temperature field of foundation soils,especially when the actual conditions of snow cover are considered in the upper boundary conditions.Snow cover will greatly affect the distribution of temperature field around the pipe foundation soils and the active layer thickness.At the 30th year of pipeline operation,the maximum thaw depth in the foundation soils under the boundary conditions with snow cover and without on the ground surface would be 6.32 m and 5.39 m,respectively.Snow cover has a good thermal insulation effect on the underlying pipe foundation soils in winter,leading to rising ground temperatures and accelerated melting of ground ice around the pipelines and deepening of the permafrost thaw under the pipeline.Under the condition of the pipeline right-of-way with snow cover,the minimum ground temperature at the depth of 0.05 m and 1 m under the mineral soil surface would be about 4.5℃and 2.4℃higher than that without snow cover,and the occurrence date of the annual minimum ground temperature would be about 10 days later than that without snow cover.Therefore,proper mitigative measures should be taken in the pipeline design,construction and operation phases to effective

关 键 词：多年冻土 积雪 管基土 地温 数值模型模拟 

分 类 号：P642.14[天文地球—工程地质学]