冻土隧道浅埋段融化险情预警及处理措施  

Risk warning and treatment measures of tunnel entrance section in Plateau Permafrost

作　　者：李云 LI Yun(JSTI GROUP,Nanjing City,Jiangsu Province,Zip code 211112)

机构地区：[1]苏交科集团股份有限公司,江苏南京211112

出　　处：《黑龙江交通科技》2020年第2期145-146,148,共3页Communications Science and Technology Heilongjiang

摘　　要：依托国家西部大开发战略,青藏高原公路建设迅猛发展,而该地区山地丘陵、雪山冻土等复杂地质条件比比皆是,设计隧道穿越冻土山岭也成为提高公路通达性和提高公路等级的一项重要举措。而目前国内外高原冻土隧道施工经验较为匮乏,高寒高海拔常年低温冻土地区,隧道覆土反复冻融地质破碎构造复杂,冻土隧道开挖,特别是洞口浅埋段会引起地表热交换,易引起冻土的融化导致边坡热融滑塌、覆盖层塌陷、拱部变形等等问题。以青藏高原祁连山某冻土隧道进洞施工过程监控量测中的一次监控预警、原因分析及处理措施,为高原高寒区冻土隧道施工提供借鉴,借此希望可以给广大公路建设管理者以启发。Relying on the national strategy of Western development,highway construction in Qinghai-Tibet Plateau has developed rapidly,and the complex geological conditions such as mountainous and hilly areas,snow mountain and permafrost are ubiquitous in this area.The design of tunnels through permafrost mountains has become an important measure to improve highway accessibility and highway grade.At present,the construction experience of tunnels in plateau permafrost is relatively scarce at home and abroad.In permafrost areas with high altitude and high altitude,the geological fragmentation structure of tunnel overlying soil is complex,and the excavation of tunnels in permafrost,especially the shallow buried section at the entrance of tunnels,will cause surface heat exchange,which will easily lead to the thawing of permafrost,thermal collapse of slope,collapse of overburden,deformation of arch and so on.In this paper,a monitoring and early warning,cause analysis and treatment measures in the monitoring and measurement of tunneling construction process of a permafrost tunnel in Qilian Mountains of Qinghai-Tibet Plateau are used for reference in the construction of permafrost tunnels in Plateau and alpine regions,hoping to inspire the general highway construction managers.

关 键 词：冻土隧道 险情预警 处理措施 

分 类 号：U433[交通运输工程—道路与铁道工程]