摘要
层状岩体在地下工程中经常遇到的,它具有明显的各向异性力学性质。结合共和隧道现场监测和数值模拟相结合的方法对层状岩体的破坏特征进行了分析,研究结果表明:围岩的变形位移、破坏区都主要集中隧道拱顶右侧,即靠河侧大于靠山侧。隧道围岩变形破坏区不在最大主应力方向上,而是在岩体层理垂直方向。层状岩体中洞室变形破坏特征除了因地形产生的偏压影响外,更重要的是受地层结构特征的影响,即与层状岩体的力学性质极大相关,其结果可为指导隧道的施工和设计提供有效依据。
Layered rockmass which is always met in underground engineering has obvious anisotropic mechanical properties. Based on the in-situ monitoring of Gonghe Tunnel and numerical simulation, the failure feature of layered rockmass was analyzed; and the results show that the surrounding rock deformation and displacement, contact pressure and fracture zone mainly exist on the right side of the tunnel vault, that is, the side near the river is larger than that near the mountain. The fracture zone of surrounding rock deformation exists in the perpendicular direction of stratification bedding of rockmass rather than in the direction of maximum principal stress. Besides the influence of unsymmetrical pressure of topography, the strata configuration characteristics put more influence on the failure feature of deformation of layered rockmass, that is, it has close relationship with the mechanical properties of layered rockmass. This research can provide some effective evidence for tunnel construction and design.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2010年第4期1163-1167,共5页
Rock and Soil Mechanics
基金
国家创新研究群体基金(50621403)
国家自然科基金(50704039)
重庆大学研究生科技创新基金(200805B1B0010289)
关键词
深埋隧道
层状岩体
围岩变形特征
deep buried tunnel
layered rockmass
deformation characteristics of surrounding rockmass
