收敛约束法在挤压性围岩隧道中的应用  

Application of Convergence-confinement Method in Squeezing Surrounding Rock Tunnel

作　　者：刘志春[1,2,3] 柳平洋 陶正委 孙明磊 郭小龙[1,2,3] LIU Zhichun;LIU Pingyang;TAO Zhengwei;SUN Minglei;GUO Xiaolong(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Key Laboratory of the Ministry of Education for Road and Railway Engineering Safety Assurance,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,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,河北石家庄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,河北石家庄050043 [3]石家庄铁道大学土木工程学院,河北石家庄050043

出　　处：《石家庄铁道大学学报（自然科学版）》2024年第2期48-55,126,共9页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：中国国家铁路集团有限公司科技研究开发计划项目(N2020G040);中国铁建股份有限公司科技重大专项(2019-A04);河北省自然科学基金(E2021210091)。

摘　　要：由于挤压性围岩隧道围岩性质与应力环境的特殊性,其围岩特征曲线与常规隧道有明显差异。为研究挤压性围岩隧道围岩-支护相互作用关系,考虑支护效应修正围岩特征曲线,研究不同变形等级对修正围岩特征曲线的影响规律,优化挤压性围岩双线铁路隧道初期支护。研究结果表明,毛洞状态下,受双线隧道断面应力集中影响,拱脚和墙脚为安全控制位置;随着变形等级和侧压力系数增加,支护特征曲线与修正围岩特征曲线不再相交;Ⅰ、Ⅱ级变形采用单层支护可满足安全要求,锚杆只需布置在拱部和边墙位置,Ⅱ级及以上变形锚杆需要全环布置;Ⅳ级变形在采用双层支护的同时,需考虑改善洞室形状、超前加固等措施。Due to the particularity of surrounding rock properties and stress environment of squeezing surrounding rock tunnel,the characteristic curve of surrounding rock is obviously different from that of conventional tunnel.In order to study the interaction relationship between surrounding rock and support in squeezing surrounding rock tunnel,the characteristic curve of surrounding rock was modified by considering the support effect.The influence of different deformation grades on the modified characteristic curve of surrounding rock was studied,and the primary support of double-track railway tunnel with squeezing surrounding rock was optimized.The results show that the arch foot and the wall foot are safe control positions due to the influence of stress concentration under the condition of a rough tunnel.With the increase of deformation grade and lateral pressure coefficient,the support characteristic curve and the modified surrounding rock characteristic curve no longer intersect.The deformation of gradeⅠand gradeⅡcan meet the safety requirements by using single-layer support.The anchors only need to be arranged in the arch and side wall positions,and the deformation anchors of gradeⅡand above need to be arranged in the whole ring.GradeⅣdeformation needs to consider measures such as improving the shape of the tunnel and advanced reinforcement while adopting double-layer support.

关 键 词：挤压性围岩隧道 变形等级 应力释放法 修正围岩特征曲线 支护特征曲线 

分 类 号：U451[建筑科学—桥梁与隧道工程]