深埋隧道挤压大变形分级标准与控制技术研究  

Research on the Classification Standard and Control Technology of Large Extrusion Deformation in Deep Tunnel

作　　者：朱正国[1] 方智淳 韩智铭 丁祥 马超义 孙明磊 王志伟[5] ZHU Zhengguo;FANG Zhichun;HAN Zhiming;DING Xiang;MA Chaoyi;SUN Minglei;WANG Zhiwei(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuag Tiedao University,Shijiazhuang,Hebei 050043,China;Key Laboratory of Roads and Railway Engineering Safety Control,Ministry of Education,Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043,China;China Railway Fifth Survey and Design Institution Group Co.Ltd,Beijing 102600,China;Hebei Province Technical Innovation Center of Safe and Effective Mining of Metal Mines,Shijiazhuang,Hebei 050043,China;State Key Laboratory for Track Technology of High-speed Railway,China Academy of Railway Sciences,Beijing 100081,China)

机构地区：[1]石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室,石家庄050043 [2]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,石家庄050043 [3]中铁第五勘察设计院集团有限公司,北京102600 [4]河北省金属矿山安全高效开采技术创新中心,石家庄050043 [5]高速铁路轨道技术国家重点实验室(中国铁道科学研究院),北京100081

出　　处：《铁道工程学报》2022年第5期47-52,共6页Journal of Railway Engineering Society

基　　金：国家自然科学基金项目(51978424);河北省自然科学基金项目(E2019210182);中国铁建股份有限公司科技重大专项(2019-A05);高速铁路轨道技术国家重点实验室(中国铁道科学研究院)开放课题基金资助(2019YJ196)。

摘　　要：研究目的:深埋隧道施工中会遇到各种地质灾害,其中在高地应力软弱围岩条件下出现挤压性大变形破坏,已成为亟待解决的问题之一。为探究深埋隧道挤压性大变形分级标准并提出相应控制措施,以中兰客专尖山隧道为背景,通过数值模拟对深埋挤压大变形隧道受力和变形规律进行分析,并据此提出大变形分级标准评价体系,采用层次分析法和模糊综合评价法建立分级标准,以期为深埋隧道工程的安全施工提供科学指导。研究结论:(1)初期支护结构受力以压应力为主,左侧拱腰部位的压应力较大,拉应力分布在拱底与拱脚部位;(2)洞周沉降和隆起最大部位是在拱顶和拱底处,水平收敛较大的部位在上台阶,掌子面初始阶段的变形速度比较大;(3)将大变形等级分为严重大变形、中等大变形、轻微大变形、无大变形,并按深埋隧道挤压性大变形分级标准评价体系对尖山隧道进行风险评估;(4)现场监测结果表明,小导管超前注浆、优化锚杆长度和角度、打设锁脚锚杆、多层支护的控制技术措施对于变形控制起到良好的效果;(5)本研究成果可为相关深埋隧道工程的设计与施工提供参考和借鉴。Research purposes: Various geological disasters will be encountered in the construction of deep buried tunnel, among which the large extrusion deformation and failure under the condition of high ground stress and weak surrounding rock has become one of the problems to be solved urgently. In order to explore the classification standard of large deformation of deep buried tunnel and put forward corresponding control measures, taking Jianshan tunnel of Zhongwei-Lanzhou passenger dedicated line as the background, the stress and deformation law of deep buried extrusion large deformation tunnel are analyzed through numerical simulation, and the evaluation system of large deformation classification standard is proposed. The classification standard is established by analytic hierarchy process and fuzzy comprehensive evaluation method, to provide scientific guidance for the safe construction of deep tunnel engineering.Research conclusions:(1) The stress of the initial support structure is mainly compressive stress, the compressive stress at the left arch waist is large, and the tensile stress is distributed at the arch bottom and arch foot.(2) The maximum settlement and uplift around the tunnel are at the arch crown and arch bottom, the part with large horizontal convergence is at the upper step, and the deformation speed of the tunnel face in the initial stage is relatively large.(3)The grade of large deformation is divided into severe large deformation, medium large deformation, slight large deformation and no large deformation. The risk assessment of Jianshan tunnel is carried out according to the classification standard evaluation system of large deformation of deep buried tunnel.(4)The field monitoring results show that the control technical measures of small conduit advance grouting, optimization of bolt length and angle, setting foot locking bolt and multi-layer support have a good effect on deformation control.(5)The research results can provide reference for the design and construction of related deep tunnel proj

关 键 词：深埋隧道 挤压性大变形 影响因素 分级标准 

分 类 号：U455[建筑科学—桥梁与隧道工程]