【作者】 王乐华； 柏俊磊； 李建林； 汤开宇； 孙旭曙；

【Author】 WANG Le-hua;BAI Jun-lei;LI Jian-lin;TANG Kai-yu;SUN Xu-shu;China Three Gorges Univ.Key Lab.of Geological Hazards on Three Gorges Reservoir Area,Ministry of Education;

【机构】 三峡大学三峡库区地质灾害教育部重点实验室；

【摘要】 对不同节理倾角、不同节理连通率的预制节理圆柱形岩体试样进行单轴压缩试验。结果表明:试样的强度、变形特性及破坏模式与节理构造形态密切相关;在不同节理连通率下,不同角度的非贯通节理试样的力学特性均表现出各向异性特征,随着节理连通率的增大,各向异性特征越来越明显,岩体峰值强度逐渐下降,岩体在弹性阶段的最大弹性模量也逐渐降低;相应地试件的破坏模式也变得更加复杂,随着节理连通率的增大,应力—应变曲线的斜率逐渐减小,曲线出现多个峰值,且有较明显的屈服平台;非贯通节理岩体峰值强度随节理连通率的非线性变化规律和弹性模量随节理连通率的非线性变化规律可分别采用二次和三次多项式函数表示,其系数与节理倾角有关;非贯通节理试样的裂纹变化特征与节理连通率、节理倾角有着密切的联系.更多还原

【Abstract】 Prefabricated joints cylindrical to different joint angle,joint connectivity specimens were studied under uniaxial compression.The results show that:the strength of the specimen,the deformation characteristics and failure modes and the joint structure is closely related to the forms.In different joint connectivity rate,non interpenetrated jointed mechanical properties showed anisotropic characteristics,with the increase of jointed connectivity rate,peak strength gradually decreased,the maximum elastic modulus of rock mass in the elastic stage,corresponding to the failure modes of specimens becoming more complex,with the increase of jointed connectivity rate,the slope of stress strain curves decreases,multiple peak,and obvious yield platform appears;law and non—linear elastic modulus change non through peak strength of jointed rock mass with joint connectivity with the law of the nonlinear change of joint connectivity rate can be used for representation and three polynomial function two times,the coefficient associated with the joint inclination;non interpenetrated jointed test crack change characteristics and joint parts jointed connectivity rate,are closely linked.更多还原