【摘要】 用微机控制高刚度伺服试验机,开展预制贯穿节理类岩石试件的单轴压缩试验,系统研究贯穿节理类岩石试件峰后应力–应变曲线、破坏形式、峰后残余强度、峰后视泊松比等与裂隙倾角之间的关系。试验发现:(1)节理倾角为15°时,峰后的应力–应变曲线和完整试件的基本相同,当节理倾角为30°,40°,50°,60°时,峰后应力–应变曲线与完整试件的差别很大;(2)峰值强度随着节理倾角的增大而减小,峰后的残余强度也大致上随节理倾角增大而减小;(3)随着节理倾角的增大,含节理试件的泊松比也随之增大,而峰值强度后破坏阶段的视泊松比则随之变小;(4)试件峰后破坏模式随节理倾角的变化而不同,在倾角为15°时为劈裂破坏,倾角为50°,60°时为剪切破坏,倾角为30°,40°时为劈裂和剪切破坏的混合模式。研究成果可以反映含单组全贯穿节理类岩石材料的加载破坏峰后力学和变形破坏特性。更多还原

【Abstract】 The uniaxial compression test of pre-existing persistent jointed rock-like specimens is carried out by high stiffness servo control testing machine. Systematic researches on the relationship of post-peak stress-strain curve,failure form,strength after peak,the Poisson’s ratio after peak of rock masses with dip angles of persistent joints are performed. The results indicate that:(1) The post-peak stress-strain curves of specimens with joint inclination angle of 15°and complete specimens are basically the same,but the post-peak stress-strain curves of specimens with the joint inclination angle of 30°,40°,50° to 60° and complete specimens vary greatly.(2) Peak strength decreases with the increase of joint inclination angle,residual post-peak strength also generally increases as the joint angle increases.(3) Poisson’s ratio of jointed specimen increases with joint inclination angle increases,but the post-peak visual Poisson’s ratio becomes smaller in the phase of destruction with joint inclination angle increases.(4) The post-peak failure modes of specimen change with joint inclination angle. Specimens damage is splitting failure at the joint inclination angle of 15°,shear failure at the joint inclination angle of 50° and 60°, splitting and shear mixing model at the joint inclination angle of 30° and 40°. The research result can reflect mechanics,deformation and damage characteristics under uniaxial compressive loading in the phase of post-peak of rock masses with different dip angles pre-existing persistent joints.更多还原