常法向刚度下岩石节理剪切力学特性试验研究
首发时间:2020-12-03
摘要:常法向刚度下岩石节理剪切力学特性对于深部岩体稳定性具有重要意义。本文采用直剪试验系统RDS-200对不同恒定法向刚度下岩石剪切力学特性进行了试验研究。结果表明:整体上,当初始法向应力一定时,峰值剪切应力和峰前剪切刚度随法向刚度增大而增大,与法向刚度呈线性关系;除法向刚度较小且初始法向应力较大的情况外,峰值剪切位移随法向刚度增大而增大;除法向刚度较大而初始法向应力较小的情况外,整体上峰后剪切刚度随法向刚度增大而增大。在法向刚度较大时,整体上,岩石节理法向位移在剪切过程中呈现先剪缩再剪胀后剪缩的三阶段变形趋势,岩石节理法向应力在剪切过程中呈现先增加后减小的趋势;在法向刚度较小时,剪接过程中岩石节理仅存在剪胀现象,岩石节理法向应力仅存在随剪切位移增加阶段。
For information in English, please click here
Experimental study on shear mechanical properties of rock joints with constant normal stiffness
Abstract:The shear mechanical properties of rock joints with constant normal stiffness are of great significance to the stability of deep rock mass. In this paper, the direct shear test system RDS-200 is used to study the shear mechanical properties of rock under different constant normal stiffness. The results show that: on the whole, when the initial normal stress is constant, the peak shear stress and pre-peak shear stiffness increase with increasing normal stiffness, and have a linear relationship with the normal stiffness; the peak shear displacement increases with increasing normal stiffness except that the normal stiffness is small and the initial normal stress is large; except that the normal stiffness is large anExperimental study on shear mechanical properties of rock joints with constant normal stiffnessd the initial normal stress is small, the post-peak shear stiffness increases with increasing normal stiffness. When the normal stiffness is large, the normal displacement of rock joints presents a three-stage deformation trend of first shear shrinkage, then dilatation and then shear shrinkage, and the normal stress of rock joints increases first and then decreases during the shearing process; when the normal stiffness is small, there is only shear dilatation phenomenon in the shear process of rock joints, and the normal stress of rock joints only increases with increasing shear displacement.
Keywords: Rock mechanics joint shear mechnical properties test
基金:
引用
No.****
动态公开评议
共计0人参与
勘误表
常法向刚度下岩石节理剪切力学特性试验研究
评论
全部评论0/1000