冻土隧道超前支护适应性及施工控制技术  

Adaptability of Frozen Tunnel Advance Support and Construction Control Technology

作　　者：李博融[1] 董长松[1] 叶莉[1] 韩常领[1] 夏才初[2] LI Borong;DONG Changsong;YE Li;HAN Changling;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38-43,共6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：为明确冻土隧道超前支护适应性,主要进行了冻土段超前小导管和管棚的加固效果研究。结果表明:超前管棚和超前小导管应用于高温多年冻土段时,热扰动产生融化圈,在注浆加固范围以外形成热融弱化区,影响其加固效果。根据融化圈的影响深度,双层超前小导管对围岩温度场的扰动是管棚的3~4.5倍。管棚施工中,采用自进式跟管钻进工艺,可有效防止热融塌孔,显著提高孔效率。In order to clarify the adaptability of advance support in frozen soil tunnel,the reinforcement effect of advance small conduit and pipe shed in frozen soil section is mainly studied.The results show that when advanced pipe shed and small pipes are used in high temperature permafrost section,the thermal disturbance produces a melting circle,which forms a melting weakening zone outside the grouting reinforcement area and affects the reinforcement effect.According to the influence depth of the melting zone,the disturbance of the double-layer leading duct to the temperature field of surrounding rock is 3-4.5 times as much as that of the pipe shed.In pipe shed construction,self-propelled pipe following drilling technology can effectively prevent thermal collapse and significantly improve hole efficiency.

关 键 词：多年冻土 隧道工程 施工控制 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]