Deformation monitoring and analysis at two frost mounds during freeze–thaw cycles along the Qinghai–Tibet Engineering Corridor  

作　　者：LiHui Luo Wei Ma YanLi Zhuang ZhongQiong Zhang 

机构地区：[1]Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou,Gansu 730000, China [2]State Key Laboratory of Frozen Soils Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China

出　　处：《Research in Cold and Arid Regions》2017年第4期378-383,共6页寒旱区科学（英文版）

基　　金：supported by the National Natural Science Foundation of China (41301508, 41630636)

摘　　要：This paper presents various deformation-monitoring technologies employed to monitor the frost heave and thaw settlement of two mounds along the Qinghai–Tibet Engineering Corridor(QTEC), China. The QTEC is known as a critical infrastructure and passage connecting inland China and the Qinghai–Tibet Plateau(QTP). Three technologies—global navigation satellite system(GNSS), terrestrial laser scanning(TLS), and unmanned aerial vehicle(UAV)—were used to estimate the freeze/thaw–induced 3D surface deformation of two frost mounds. Our results showed that (1) the two frost mounds exhibited mainly thaw settlement in thawing periods and frost heave in the freezing period, but frost heave dominated after repeated freeze–thaw cycles;(2) different zones of the mounds showed different deformation characteristics;(3) active-layer thickness(ALT) and elevation changes were highly correlated during thaw periods;(4) integrated 3D-measurement technologies can achieve a better understanding and assessment of hazards in the permafrost area.This paper presents various deformation-monitoring technologies employed to monitor the frost heave and thaw settlement of two mounds along the Qinghai-Tibet Engineering Corridor (QTEC), China. The QTEC is known as a critical infrastructure and passage connecting inland China and the Qinghai-Tibet Plateau (QTP). Three technologies-global navigation satellite system (GNSS), terrestrial laser scanning (TLS), and unmanned aerial vehicle (UAV)-were used to estimate the freeze/thaw-induced 3D surface deformation of two frost mounds. Our results showed that (1) the two frost mounds exhibited mainly thaw settlement in thawing periods and frost heave in the freezing period, but frost heave dominated after repeated freeze-thaw cycles; (2) different zones of the mounds showed different deformation characteristics; (3) active-layer thickness (ALT) and elevation changes were highly correlated during thaw periods; (4) integrated 3D-measurement technologies can achieve a better understanding and assessment of hazards in the permafrost area.

关 键 词：FROST mound thaw settlement FROST HEAVE freeze–thaw cycles surface DEFORMATION 

分 类 号：TU445[建筑科学—岩土工程]