中国铁道科学2023，Vol.44Issue(6)：34-45,12.DOI:10.3969/j.issn.1001-4632.2023.06.04
高温冻土区块石护坡路基长期热状况观测与预测研究
Field Observation and Prediction of Long-Term Thermal Regime of Crushed Rock Revetment Embankment Built on Warm Permafrost
摘要
Abstract
Crushed rock revetment embankment(CRRE)has been widely used in the construction and reinforcement of highways and railways in permafrost regions.However,there have been controversies in recent years on the cooling effectiveness of CREE.Especially,debates around whether the CREE built on warm permafrost could withstand adverse effects of future climate warming have been drawing attention in academia.Based on the field-observed data and numerical simulations along the Qinghai-Tibet Railway in the past 20 years,this study explores the long-term thermal regime of CRRE built on warm permafrost and the degradation process of warm permafrost in the context of climate warming.The results show that the CRRE can effectively raise the artificial permafrost table.After nearly 20 years of operation,the artificial permafrost table beneath the CRRE still rises by nearly 2 m compared with the original.However,during this period,there has been a warming process in the shallow permafrost subgrade.A warm permafrost layer with a thickness of 6-8 m developed beneath the artificial permafrost table.The compression and creep deformation of the layer can cause considerable embankment settlement.Till 30 years after the embankment construction,the artificial permafrost table under the embankment has declined to the same level as that of the natural permafrost table under the scenario of air temperature rise of 2.6 ℃ in 50 years.From then,the artificial permafrost table under the embankment and the natural permafrost table have declined almost synchronously,and the thawing of shallow permafrost subgrade will cause excessive embankment settlement.Therefore,for CRRE built in warm permafrost regions,it is necessary to timely adopt reinforcement measures such as thermosyphone,based on variations in the permafrost subgrade temperature and development of the embankment settlement.关键词
青藏铁路/块石护坡/高温冻土/气候变暖/路基热状况Key words
Qinghai-Tibet Railway/Crushed rock revetment/Warm permafrost/Climate warming/Embankment thermal regime分类
交通运输引用本文复制引用
王佳,赵静宜,陈领,穆彦虎,张坤,毛云程,李国玉..高温冻土区块石护坡路基长期热状况观测与预测研究[J].中国铁道科学,2023,44(6):34-45,12.基金项目
甘肃省科技计划项目(22ZD6FA004,22JR5RA382) （22ZD6FA004,22JR5RA382）
第二次青藏高原综合科学考察研究项目(2019QZKK0905) （2019QZKK0905）
