高纬高寒地区岛状冻土路基地温场的试验研究  

Experimental study on ground temperature field of patchy permafrost subgrade for high latitudes and cold regions

作　　者：常继峰[1] 李威[1] 贾贞 CHANG Jifeng;LI Wei;JIA Zhen(School of Civil Engineering,Harbin University,Harbin,Heilongjiang 150086,China;Key Lab of Underground Engineering Technology of Heilongjiang Province,Harbin,Heilongjiang 150086,China)

机构地区：[1]哈尔滨学院土木建筑工程学院,黑龙江哈尔滨150086 [2]黑龙江省地下工程技术重点实验室,黑龙江哈尔滨150086

出　　处：《石河子大学学报（自然科学版）》2021年第5期584-589,共6页Journal of Shihezi University(Natural Science)

基　　金：国家自然科学基金(31800489)。

摘　　要：准确掌握高纬高寒地区冻土路基地温特征规律是提高公路使用寿命的关键。本文以实际工程为依托,选取代表性路基试验断面,对其工后一年内的地温环境进行试验观测,发现岛状冻土路基年周期性地温变化具有明显的“冻结-恢复-融化”阶段性特点,路基各土层的升、降温拐点及地温变化范围均存在着较大差异;试验结果的对比分析表明:路基各土层对大气温度的热敏感程度随冻土上限覆土厚度的增加而逐渐减弱,当冻土上限覆土厚度≤7 m时,含冰量对填土层地温环境的影响弱于覆土厚度;当冻土上限埋深超过5 m时,在退融状态下冻土上限处地温随含冰量的增加而降低,在冻结状态下则与之相反。Mastering the characteristic laws of ground temperature exactly is the key to increase service lifespan of patchy permafrost subgrade for high latitudes and cold regions.Based on practical project and representative subgrade experimental sections,this paper obtains the practical measure datas of ground temperature field in one year after the project completion,and the study reveals the obvious stage characteristics of ground temperature change of patchy permafrost subgrade in annual cycle which are the freezing stage,transitional stage,melting stage.Both the rise and fall temperature turning points,and the variance range of ground temperature are quite different between subgrade soil layers,and then according to comparative analysis of experimental results,this paper shows that the thermal sensitivity of atmospheric temperature is weakened gradually with the covering thickness of permafrost table increasing for each soil layer;the influence of ice content on ground temperature environment is weaker than covering thickness of permafrost table when covering thickness is no larger than 7 m;and in melting stage,as the buried depth of permafrost table is more than 5 m,it’s ground temperature will be reduced with the ice content increasing,but it’s on the contrary in freezing stage.

关 键 词：岛状冻土路基 地温特征 试验分析 年周期 影响因素 

分 类 号：U416.1[交通运输工程—道路与铁道工程]