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恒法向刚度岩石节理剪切力学试验研究

发表时间:2021-03-31  浏览量:359  下载量:62
全部作者: 孙崇轩,郭保华,程坦,田世轩,孙杰豪
作者单位: 河南理工大学能源科学与工程学院
摘 要: 恒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。本文采用直剪测试系统RDS-200对不同恒法向刚度下岩石节理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。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;在法向刚度较小时,剪切过程中岩石节理仅存在剪胀现象。
关 键 词: 矿山安全;岩石力学;节理;剪切;力学特性;试验
Title: Experimental study on shear mechanics of rock joints with constant normal stiffness
Author: SUN Chongxuan, GUO Baohua, CHENG Tan, TIAN Shixuan, SUN Jiehao
Organization: School of Energy Science and Engineering, Henan Polytechnic University
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 testing system RDS-200 is used to study the shear mechanical properties of rock joints under different constant normal stiffness. The results show that 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 the increase of normal stiffness except for the case of small normal stiffness and large initial normal stress. The post-peak shear stiffness increases with the increase of normal stiffness except for the case of large normal stiffness and small initial normal stress. The normal stress of rock joints increases first and then decreases in the shear process. When the normal stiffness is large, the normal displacement of rock joints presents a three-stage deformation trend of first shear contraction, then shear dilation and then shear contraction. When the normal stiffness is small, there is only shear dilation in the shear process.
Key words: mining safety; rock mechanics; joint; shear; mechnical properties; test
发表期数: 2021年3月第1期
引用格式: 孙崇轩,郭保华,程坦,等. 恒法向刚度岩石节理剪切力学试验研究[J]. 中国科技论文在线精品论文,2021,14(1):114-123.
 
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