路基工程Issue(3)：46-50,5.DOI:10.13379/j.issn.1003-8825.2018.03.10
基于尺寸效应的节理岩体隧道开挖稳定性分析
Analysis on Tunnel Excavation Stability in Jointed Rock Mass Based on the Size Effect
摘要
Abstract
The mechanical response of jointed rock mass excavation is of significant size effect, which is very important for studying the stability of tunnel. There are four cases with different joint spaces and same tunnel size studied by the discrete element method(DEM). The study shows that: ①the structure type of surrounding rock mass transfers from blocked state to fractured one with the decrease of joint space, while the loosing and falling of rock take place. ② The plastic zone, stress loosen zone of surrounding rock mass and the open zone of joint have similar distribution rules of each other, which will increase with the decrease of joint space and appear little evident size effect before the loosing and falling of rock. ③ The shear slip failure zone of joint is bigger and has more evident size effect than the open zone of joint and plastic zone of surrounding rock mass, thereby it is suitable for the stability criterion of jointed rock mass tunnel.关键词
节理岩体/尺寸效应/稳定性分析/变形破坏/离散元数值模拟Key words
jointed rock mass/size effect/stability analysis/deformation and failure/DEM numerical simulation分类
交通工程引用本文复制引用
郑艾辰,黄锋,吴创周..基于尺寸效应的节理岩体隧道开挖稳定性分析[J].路基工程,2018,(3):46-50,5.基金项目
国家自然科学基金项目(51308574) （51308574）
中国博士后科学基金项目(2014M562286) （2014M562286）
重庆市社会民生科技创新专项(cstc2016shmszx30009) （cstc2016shmszx30009）
