浅埋倾斜层状围岩隧道变形破坏机制及地质偏压荷载计算方法研究  

Deformation and Failure Mechanism of Shallow Inclined-Layered Surrounding Rock Tunnel and Calculation Method of Geological Asymmetrically-Pressurized Load

作　　者：刘建友 房旭 房倩[2] 王军[2] LIU Jianyou;FANG Xu;FANG Qian;WANG Jun(China Railway Engineering Consulting Group Co.,Ltd.,Beijing 100055,China;Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]中铁工程设计咨询集团有限公司,北京100055 [2]北京交通大学,北京100044

出　　处：《隧道建设(中英文)》2024年第S2期101-107,共7页Tunnel Construction

基　　金：中国国家铁路集团有限公司科技研究开发计划(N2023G045)。

摘　　要：为判别倾斜层状围岩地质偏压和计算偏压荷载,建立考虑倾斜层状围岩结构特征的抽屉模型,提出考虑倾斜层状围岩参数的地质偏压荷载系数计算方法与地质偏压判别标准,分析层状围岩产生地质偏压的影响因素和影响规律,明确倾斜层状围岩变形破坏机制。研究结果表明:1)岩层面内摩擦角、隧道埋深、岩层倾角对隧道衬砌地质偏压影响较大,隧道埋深与岩层面内摩擦角越大,隧道衬砌地质偏压越小;2)岩层倾角越大,隧道衬砌地质偏压越大。依托沐川县某隧道支护破损整治工程,通过地质偏压计算与病害机制的对比分析,验证了抽屉模型在描述层状围岩地质偏压方面的有效性。To determine and calculate the geological asymmetrically-pressurized load of inclined-layered surrounding rocks,a drawer model considering the structural characteristics of inclined-layered surrounding rocks is established,and the calculation method for geological asymmetrically-pressurized load coefficient and the criterion of recognizing geological asymmetrically-pressurized load are proposed.Additionally,the influencing factors and laws of geological asymmetrically-pressurized load are analyzed,and the deformation and failure mechanism of the inclined-layered surrounding rocks is examined.The results reveal the following:(1)The internal friction angle of the rock face,tunnel buried depth,and rock layer inclination have a greater influence on the geological asymmetrically-pressurized load of the tunnel lining.The larger the tunnel buried depth and the internal friction angle of the rock face,the smaller the geological asymmetrically-pressurized load of the tunnel lining.(2)The larger the inclination angle of the rock layer,the greater the geological asymmetrically-pressurized load of the tunnel lining.A case study is conducted on a remediation project of tunnel support failure in Muchuan County,validating the effectiveness of the drawer model in describing the geological asymmetrically-pressurized load of inclined-layered surrounding rocks.

关 键 词：浅埋隧道 层状围岩 抽屉模型 地质偏压 荷载计算方法 

分 类 号：U45[建筑科学—桥梁与隧道工程]