Affiliation:
1. College of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, China
2. State Key Laboratory of Road Engineering Safety and Health in Cold and High-Altitude Regions, CCCC First Highway Consultants Co., Ltd., Xi’an 710065, China
Abstract
The Qinghai–Tibet Plateau is the highest and largest permafrost area in the middle and low latitudes of China. In this region, permafrost thaw settlement is the main form of expressway subgrade disaster. Therefore, the quantitative analysis and regionalization study of permafrost thaw settlement deformation are of great significance for expressway construction and maintenance in the Qinghai–Tibet region. This paper establishes a thaw settlement prediction model using the thaw settlement coefficient and thaw depth. The thaw depth was predicted by the mean annual ground temperatures and active-layer thicknesses using the Radial Basis Function (RBF) neural network model, and the thaw settlement coefficient was determined according to the type of ice content. Further, the distribution characteristics of thaw settlement risk of the permafrost subgrade in the study region were mapped and analyzed. The results showed that the thaw settlement risk was able to be divided into four risk levels, namely significant risk, high risk, medium risk and low risk levels, with the areas of these four risk levels covering 3868.67 km2, 1594.21 km2, 2456.10 km2 and 558.78 km2, respectively, of the total study region. The significant risk level had the highest proportion among all the risk levels and was mainly distributed across the Chumar River Basin, Beiluhe River Basin and Gaerqu River Basin regions. Moreover, ice content was found to be the main factor affecting thaw settlement, with thaw settlement found to increase as the ice content increased.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Shaanxi Province
Fundamental Research Funds for the Central Universities, CHD
Subject
General Earth and Planetary Sciences
Reference47 articles.
1. Permafrost survey and monitoring provide scientific support for geoscience research, environmental protection and engineering construction in the Qinghai Tibet Plateau;Zhao;J. Chin. Acad. Sci.,2017
2. Impact of heat and contaminants transfer from landfills to permafrost subgrade in arctic climate: A review;Akhtar;Cold Reg. Sci. Technol.,2023
3. Thermal monitoring of railway subgrade in a region of ice-rich permafrost, Yakutia, Russia;Varlamov;Cold Reg. Sci. Technol.,2018
4. Ahmed, A., and Islam, M.A. (2020, January 25–28). Effect of using geosynthetics in mitigation of freeze-thaw through numerical analysis. Proceedings of the 4th Session on Geotechnical Earthquake Engineering and Special Topics at Geo-Congress on Vision, Insight, Outlook, Minneapolis, MN, USA.
5. Ultralow-frequency seismic sounding of railway subgrade state by passing trains;Antonovskaya;Can. Geotech. J.,2022
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献