地质学报（英文版）2009，Vol.83Issue(5)：1000-1007,8.
Thermal Characteristics of the Embankment with Crushed Rock Side Slope to Mitigate Thaw Settlement Hazards of the Qinghai-Tibet Railway
Thermal Characteristics of the Embankment with Crushed Rock Side Slope to Mitigate Thaw Settlement Hazards of the Qinghai-Tibet Railway
摘要
Abstract
Permafrost (perennially frozen ground) appears widely in the Golmud-Lhasa section of the Qinghai-Tibet railway and is characterized by high ground temperature (≥-1℃) and massive ground ice. Under the scenarios of global warming and human activity, the permafrost under the railway will gradually thaw and the massive ground ice will slowly melt, resulting in some thaw settlement hazards, which mainly include longitudinal and lateral cracks, and slope failure. The crushed rock layer has a thermal semiconductor effect under the periodic fluctuation of natural air. It can be used to lower the temperature of the underlying permafrost along the Qinghai-Tibet railway, and mitigate the thaw settlement hazards of the subgrade. In the present paper, the daily and annual changes in the thermal characteristics of the embankment with crushed rock side slope (ECRSS) were quantitatively simulated using the numerical method to study the cooling effect of the crushed rock layer and its mitigative ability. The results showed that the ECRSS absorbed some heat in the daytime in summer, but part of it was released at night, which accounted for approximately 20% of that absorbed. Within a year, it removed more heat from the railway subgrade in winter than that absorbed in summer. It can store approximately 20% of the "cold" energy in subgrade. Therefore, ECRSS is a better measure to mitigate thaw settlement hazards to the railway.关键词
Qinghai-Tibet railway/ climate change/ embankment with crushed rock side slope/numerical analysis/ thaw settlementKey words
Qinghai-Tibet railway/ climate change/ embankment with crushed rock side slope/numerical analysis/ thaw settlement分类
天文与地球科学引用本文复制引用
LI Guoyu,MU Yanhu,ZHANG Xia..Thermal Characteristics of the Embankment with Crushed Rock Side Slope to Mitigate Thaw Settlement Hazards of the Qinghai-Tibet Railway[J].地质学报（英文版）,2009,83(5):1000-1007,8.基金项目
The present work was supported by the National Natural Science Foundation of China (Grant Nos 40801022 and 40821001), the Chinese Academy of Sciences (CAS) Knowledge Innovation Key Directional Program (Grant Nos KZCX2-YW-Q03-04 and KZCX2-YW-311), CAS Western Project (Grant No. KZCX2-XB2-10), China Postdoctoral Science Foundation (No. 20080430110), CAS 100-Talent Programs "Stability of Linear Engineering Foundations in Warm Permafrost Regions under a Changing Climate" and "Deformation and Stability of Roadbed in Permafrost Regions", CAS West Light Foundation for PhD GY. Li, Funds of the State Key Laboratory of Frozen Soils Engineering, CAS (Grant Nos SKLFSE-ZQ-02 and SKLFSE-ZY-03). （Grant Nos 40801022 and 40821001）
