青藏铁路多年冻土路基现状及分析  

Present State and Analysis of Subgrade in Permafrost Region of Qinghai-Tibet Railway

作　　者：郭惠芹 王李阳 王蕴嘉 陈锋 王仲锦 张千里 GUO Huiqin;WANG Liyang;WANG Yunjia;CHEN Feng;WANG Zhongjin;ZHANG Qianli(Postgraduate Department,China Academy of Railway Sciences,Beijing 100081,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Railway Science and Technology Research and Development Center,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院研究生部,北京100081 [2]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [3]中国铁道科学研究院集团有限公司铁道科学技术研究发展中心,北京100081

出　　处：《铁道建筑》2023年第1期116-121,共6页Railway Engineering

基　　金：国家自然科学基金(U2268216);中国国家铁路集团有限公司科技研究开发计划(P2021G047);中国铁道科学研究院集团有限公司基金(2020YJ117)。

摘　　要：青藏铁路开通运营16年后,多年冻土路基情况整体良好,仅部分路段存在路基沉降变形、排水不良、路基开裂等病害;主要采用土护道、片石护坡、热棒、排水盲沟等综合补强措施,大部分地区整治效果良好。通过分析,多年冻土路基病害产生的根本原因是多年冻土场变化及水热防护不足,而现有补强措施大多遵循主动降温、冷却地基、保护冻土的原则,忽略了水热侵蚀对多年冻土的影响,因此还需增加水热防护措施;对于常见多年冻土路基病害且成因清晰的地段仍可采用现有措施进行补强,而对于病害反复发生地段需重新勘察后再制定整治方案。此外,考虑气温升高对多年冻土的影响,还需开展更高升温条件下现有补强措施的有效性及新型补强措施的研究。After 16 years of operation of the Qinghai-Tibet Railway,the permafrost subgrade was in good condition as a whole,and only some sections had subgrade settlement deformation,poor drainage,subgrade cracking and other diseases.Comprehensive reinforcement measures such as earth berm,rubble slope protection,hot rod,blind drainage ditch and so on were mainly adopted,and the improvement effect in most areas was relative good.The analysis results show that the main reasons for the formation of permafrost subgrade diseases are the changes of permafrost field and the lack of water and heat protection,while the existing reinforcement measures mostly follow the principles of active cooling,foundation cooling and protecting the frozen soil,which ignoring the impact of water and heat erosion on the permafrost,so it is necessary to add water and heat protection measures.The existing measures can still be taken to reinforce the sections with common permafrost subgrade diseases and clear causes,while the sections with repeated diseases need to be re-examined before formulating the improvement plan.In addition,after considering the impact of temperature rise on permafrost,it is also necessary to carry out research on the effectiveness of existing reinforcement measures and new reinforcement measures under higher temperature rise conditions.

关 键 词：青藏铁路 多年冻土 服役状态 路基病害 整治措施 水热防护措施 

分 类 号：U213.1[交通运输工程—道路与铁道工程]