加锚云母片岩隧道围岩失效特征及力学效应  

Failure Characteristics and the Mechanical Effect of Mica Schist in an Anchored Tunnel

作　　者：左昌群[1,2] 丁少林[1] 刘代国 孙金山[1] 徐颖[1] 

机构地区：[1]中国地质大学(武汉)工程学院,武汉430074 [2]岩土钻掘与防护教育部工程研究中心,武汉430074

出　　处：《现代隧道技术》2014年第4期39-45,共7页Modern Tunnelling Technology

基　　金：国家自然科学基金项目(No.41202201);中央高校基本科研业务费专项资金项目(CUGL110215)

摘　　要：在深埋云母片岩地层中,隧道的锚杆支护结构常发生失效,进而引发围岩大变形问题,威胁隧道施工安全和结构的可靠度。文章采用现场试验及数值计算相结合的手段,分析了云母片岩地层隧道围岩的应力应变特征和松动圈形态,研究了片岩地层中锚-岩复合体的应力关系和失效特征,可为云母片岩及层状各向异性岩体地层隧道支护方案设计、围岩变形控制及减灾避灾提供参考。In a deep mica schist stratum, the anchor bolt support structure of a tunnel will frequently fail, resulting in large surrounding-rock deformation and endangering the safety of tunnel construction and reliability of the structure. Combining field experiments and numerical calculations, the characteristics of stress-strain and forms of loosening circles around a tunnel in a mica schist stratum are analyzed and the stress relationship and failure characteristics of the anchor-rock complex in a mica schist stratum are studied, providing a reference for support design, rock deformation control, and disaster prevention in mica schist and stratified anisotropic rock masses.

关 键 词：公路隧道 云母片岩 砂浆锚杆 大变形 失效机制 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]