层状软岩隧道岩体开挖稳定性研究  

Research on Rock Mass Excavation Stability of Layered Soft Rock Tunnel

作　　者：吴明先[1] 李博融[1] 刘智[1] WU Ming-xian;LI Bo-rong;LIU Zhi(CCCC First Highway Consultants Co.Ltd.,Xi'an 710075,China)

机构地区：[1]中交第一公路勘察设计研究院有限公司,西安市710075

出　　处：《公路》2023年第7期1-9,共9页Highway

基　　金：陕西交通科技项目,项目编号2015-11K。

摘　　要：层状岩体作为一种典型的复杂岩体,通常具有显著的横观各向同性或正交各向异性特征,层状岩体由于具有层状结构,不仅变形和强度性质具有明显的各向异性,岩体的破坏机理及方式也不同于其他岩体。依托陕西秦岭某在建公路隧道工程,结合超大跨度公路隧道的建设经验和安全控制措施,建立层状软岩中开挖大跨度隧道的稳定性分析方法和稳定性控制标准,在总结分析层状软岩工程特性的基础上,通过收集项目依托工程的地质资料及设计资料,建立了层状岩体隧道开挖及支护的数值计算模型,研究层理面作用下的隧道开挖力学响应特征,分析层理面倾角和间距对隧道开挖稳定性的影响,进一步揭示超大跨度层状软岩公路隧道偏压形成机制。As a typical complex rock mass,layered rock mass usually has significant transverse isotropy or orthotropic characteristics.Due to its layered structure,layered rock mass not only has obvious anisotropy in deformation and strength properties,but also its failure mechanism and mode are different from other rock masses.Based on a highway tunnel that under construction in Shaanxi Province,combined with the construction experience and safety control measures of super long-span highway tunnel at home and abroad,the stability analysis method and stability control standard of excavating long-span tunnel in layered soft rock are established.On the basis of summarizing and analyzing the engineering characteristics of layered soft rock,by collecting the geological data and design data of the project,the numerical calculation model of layered rock tunnel excavation and support is established,the mechanical response characteristics of tunnel excavation under the action of bedding plane are studied,the influence of bedding plane inclination and spacing on tunnel excavation stability is analyzed,and the formation mechanism of bias pressure of super long-span layered soft rock highway tunnel is further revealed.

关 键 词：公路隧道 层状岩体 开挖稳定性 塑性区 破坏模式 

分 类 号：U455.7[建筑科学—桥梁与隧道工程]