岛状冻土路基竖向位移周期性热响应试验研究  

Experimental Study on Periodic Response of Vertical Displacement Along with Ground Temperature for Patchy Permafrost Subgrade

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

机构地区：[1]哈尔滨学院工学院,哈尔滨150086 [2]黑龙江省地下工程技术重点实验室(哈尔滨学院),哈尔滨150086

出　　处：《三峡大学学报（自然科学版）》2021年第1期76-81,共6页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金项目(31800489)。

摘　　要：大、小兴安岭等高纬高寒地区,由于区域内多为退化性岛状多年冻土,其公路建设难度主要取决于冻土路基的热稳定状态,准确分析岛状冻土路基竖向热位移的发生及发展特点,是提高公路使用寿命,保证公路使用安全的前提.以小兴安岭地区前嫩公路为对象,选取代表性冻土路基试验断面,通过对工后一年内路基土体竖向位移进行试验观测,发现岛状冻土路基年周期性竖向热位移具有明显的阶段性特点,冻土上限处的冻、融状态对路基各土层的竖向变形有着较大影响,根据试验结果的对比分析,揭示了冻土上限覆土厚度、含水率及地基处理方式等主要影响因素对路基竖向热位移的作用效果.Because of the large parts are the degenerative patchy permafrost,the difficulty of highway construction is mainly dependent upon the thermal stability of permafrost subgrade in high latitudes and high cold regions such as the greater and lesser Xingan mountains.It is the premise both of improving the service lifespan of highway and ensuring driving safety that grasping the characteristics of occurrence and development of vertical heat displacement for this subgrade.Based on typical subgrade experimental sections of Qiannen highway in Xiaoxing’anling area,this paper reveals the obvious stage characteristics of displacement process within annual period.The experimental observation of vertical displacement to each experimental section in one year after the project completion shows that the freezing-thawing state of permafrost table has great effect on vertical deformation of subgrade soil layers.According to the experimental results,the effect of the main influencing factors on the vertical thermal displacement of subgrade is revealed,such as the thickness of the upper limit of frozen soil,the moisture content and the treatment mode of the foundation.

关 键 词：岛状冻土路基 年周期 竖向热位移 试验分析 

分 类 号：U416.1[交通运输工程—道路与铁道工程]