摘要
为了掌握坝基层理面发育变质凝灰岩的力学特性,对垂直和平行于层理面方向的变质凝灰岩试样进行了三轴压缩试验.基于试验结果,得到了不同围压下垂直和平行于层理面的变质凝灰岩强度和变形参数,研究了其强度和变形特性的各向异性特征,最后分析了三轴压缩状态下试样的破坏形式及机制.研究结果表明,变质凝灰岩强度和变形特性与层理面方位角关系密切,垂直和平行于层理面方向的强度和变形参数表现出显著的各向异性特征,并随围压呈一定规律的变化.
In order to grasp the mechanical properties of metamorphic tuff with developed horizontal bedding planes in dam foundation,experiments were carried out to investigate the metamorphic tuff specimens perpendicular to and parallel with bedding planes under conventional triaxial compression.Based on the experimental results,the strength and deformation parameters of metamorphic tuff specimens were obtained;and the anisotropic characteristics of strength and deformation properties of metamorphic tuff specimens perpendicular to and parallel with bedding planes under different confining pressures were studied.Finally,the failure forms and mechanism of metamorphic tuff specimens under conventional triaxial compression were analyzed.The results show that the strength and deformation properties of metamorphic tuff have close relationship with the azimuth of horizontal bedding planes;and the anisotropic characteristics of strength and deformation properties of metamorphic tuff perpendicular to and parallel with bedding planes are obvious and vary with confining pressures according to fixed law.
出处
《三峡大学学报（自然科学版）》
CAS
2010年第2期5-10,共6页
Journal of China Three Gorges University：Natural Sciences
基金
国家自然科学基金项目(50979030和50911130366)
国家科技支撑计划项目(2008BAB29B01)
关键词
岩石力学
各向异性
变质凝灰岩
三轴试验
力学性质
rock mechanics
anisotropy
metamorphic tuff
triaxial compression test
mechanical properties
