【摘要】 采用自制试验装置,进行边坡岩体中的软弱夹层的力学特性试验。分析实测的剪应力-变形曲线发现,该曲线有明显的比例极限、屈服点和峰值点,表明在试件受力变形初期,剪切力-变形近似呈线性关系,剪切刚度为常量;随法向应力的增大,峰值剪应力呈线性增长,达到峰值强度之后,随剪切变形增大,抗剪强度变化不大,残余强度近似等于峰值强度,表明试样发生剪切破坏,其破坏类型呈"塑性"破坏型。软弱夹层的剪切变形可分为3个阶段,各个阶段的强度参数不同,对边坡工程来说,为保证其有足够的安全系数,建议软弱夹层强度参数取低值。根据试验结果得到的法向应力-压缩位移关系曲线近似呈双曲线型,当法向相对位移小于3.4mm时与理论结果更为接近。更多还原

【Abstract】 By using homemade shear equipment, the mechanics characteristic of the weak intercalated layers in the slope rock mass are carried out. The shear stress-deformation curves have the obvious proportion limit, submission and peak stress, which indicate that, at the initial stages of the shear deformation, the shear stress-deformation is linear and the shear stiffness don’t change. With the increase of the vertical stress, the peak shear stress increases linearly. After the peak strength, the shear strength changes little with the increase of the shear deformation, and the remnant strength is approximately equal to the peak, the experiment sample subvert, which is the ‘plastic’ subversion type. The shear deformation can be divided into 3 stages, the strength parameters in every stage vary, for the slope engineering, which must have enough safety coefficient, the low strength parameters are recommended. Basing on the experiment results, it is found that the vertical stress-compression displacement curve is the hyperbola, when the vertical displacement is less than 3.4 mm, the experiment result be more close to the theoretical value. The results will guide the stability analysis and the reinforcement programme design of the high slope.更多还原