热融湖塘对冻土路基热稳定性的影响  

Effect of thermokarst lakes on thermal stability of permafrost subgrade

作　　者：闫人伟 董彬林 王桂福 Yan Renwei;Dong Binlin;Wang Guifu(Qinghai Traffic Control Construction Engineering Group Co.Ltd.,Xining 810000,China;Qinghai Guoluo Highway Engineering Construction Co.Ltd.,Xining 810000,China;Qinghai Xingli Highway&Bridge Engineering Co.Ltd.,Xining 810000,China)

机构地区：[1]青海省交控建设工程集团有限公司,西宁810000 [2]青海省果洛公路工程建设有限公司,西宁810000 [3]青海省兴利公路桥梁工程有限公司,西宁810000

出　　处：《黑龙江科技大学学报》2025年第2期268-274,共7页Journal of Heilongjiang University of Science And Technology

摘　　要：针对青藏高原多年冻土地区热融湖塘对临近的路基工程产生热扰动问题,以二治公路项目沿线的某热融湖塘为例,利用有限元软件建立了考虑气候变暖效应与热融湖塘作用下的冻土路基温度场数值计算模型,分析了有无热融湖塘以及热融湖塘与坡脚间距对冻土路基热稳定性的影响。结果表明:热融湖塘会显著影响周围冻土的热状态,引起多年冻土退化,热融湖塘距路基越近,其热扰动作用越显著;当单侧存在热融湖塘时,左右路肩冻土地温容易产生差异,导致路基产生不均匀沉降;当热融湖塘与路基相距超过20 m时,路基下伏冻土的热状态基本不受热融湖塘的影响,可将其作为热融湖塘地区冻土路基选线的临界距离。This paper seeks to address the issue of thermal disturbance caused by the thermokarst lakes on adjacent subgrade engineering in the permafrost regions of the Qinghai-Tibet Plateau.Taking a thermokarst lake along the Erzhi Highway Project as an example,the study involves establishing a numerical model of the temperature field of permafrost subgrade considering the effects of climate warming and thermokarst lakes by using finite element software,and analyzing the influence of the thermokarst lake and the distance between the thermokarst lake and the subgrade on the thermal stability of the permafrost subgrade.The results show that the thermokarst lake can affect the thermal state of surrounding permafrost significantly,causing the degradation of permafrost.The nearer the thermokarst lake is to the subgrade,the more evident its thermal disturbance effect is.With the thermokarst lake on one side,there is a different permafrost temperature on the left and right shoulders,which leads to uneven settlement of the subgrade.With the distance between the thermokarst lake and the subgrade over 20 m,the thermal state of the permafrost subgrade is basically not affected by the thermokarst lake.Therefore,the subgrade can be constructed beyond 20 m from the thermokarst lake.

关 键 词：路基工程 多年冻土区 热融湖塘 温度场 

分 类 号：U419.92[交通运输工程—道路与铁道工程]