多年冻土隧道围岩冻融圈回冻和融沉演化规律研究  

Study on the Evolution Law of Freezing-thawing Circle and Thawing Settlement of Surrounding Rock of Permafrost Tunnel

作　　者：韩常领[1] 叶莉[1] 富志鹏[1] 夏才初[2] HAN Changling;YE Li;FU Zhipeng;XIA Caichu(CCCC First Highway Consultants Co.,LTD,State Key Laboratory of Road Engineering Safety and Health in Cold and High-Altitude Regions,Xi'an 710075,China;Department of Underground Architecture and Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]中交第一公路勘察设计研究院有限公司高寒高海拔地区道路工程安全与健康国家重点实验室,陕西西安710065 [2]同济大学地下建筑与工程系,上海200092

出　　处：《灾害学》2019年第A01期47-51,共5页Journal of Catastrophology

基　　金：西藏自治区重点研发与转化计划项目(XZ201801-GB-07);国家重大仪器专项项目(2017YFF0108705,2017YFF0108706)

摘　　要：以共和至玉树公路的姜路岭公路隧道为依托,开展隧道不同冻土段围岩冻融圈的演化规律及各因素对隧道不同冻土段围岩冻融圈的影响规律研究。结果表明:工况不变,随时间持续,冻融圈深度随之增大;围岩开挖后喷射混凝土支护,延迟1d施作,则冻融圈深度增大约10cm。喷射混凝土施作越迟,围岩的的冻融圈深度越大。在隧道运营期间,隧道非冻土段的围岩在外界气温荷载作用下将冻结,且冻结深度随着年份增加而增大,100年后可达26m。Based on the Jiangluling Highway Tunnel of Gonghe-Yushu Highway,the evolution law of the freeze-thaw zone of surrounding rock in different frozen soil sections of the tunnel and the influence law of various factors on the freeze-thaw zone of surrounding rock in different frozen soil sections of the tunnel are studied.The results show that the depth of freeze-thaw zone increases with time and the depth of freeze-thaw zone increases by about 10 cm when the surrounding rock is excavated and shotcrete support is delayed for 1 day.The later the shotcrete is applied,the deeper the freeze-thaw zone of surrounding rock is.During the operation of the tunnel,the surrounding rock of the tunnel in the non-frozen section will be frozen under the action of external temperature load,and the frozen depth will increase with the increase of years,reaching 26 m after 100 years.

关 键 词：多年冻土 公路隧道 回冻 融沉 冻融圈 

分 类 号：U455.4[建筑科学—桥梁与隧道工程] X43[交通运输工程—道路与铁道工程]