岩土工程学报2025，Vol.47Issue(8)：1653-1661,9.DOI:10.11779/CJGE20240361
循环荷载下粗糙节理剪切力学特性与剪切行程的关系研究
Relationship between shear mechanical characteristics of rough joints and shear displacement under cyclic loading
摘要
Abstract
To investigate the mechanical behavior of rough joint surfaces under cyclic the shear,shear tests are conducted using the rock joint bi-directional dynamic cycling shear test system to study the evolution of shear stress,normal displacement and dilation angle of rough joint surfaces under different shear displacements.The results show that:(1)The peak negative shear stress after positive shear gradually decreases with an increase in the shear displacement,and the negative peak strength decreases from 4.13 MPa to 2.94 MPa.(2)The shear stiffness continuously decreases and tends to stabilize with an increase in the tangential displacement.The average shear stiffness of positive shear decreases from 473.69 MPa/m to 21.37 MPa/m,and that of negative shear decreases from 413.82 MPa/m to 8.95 MPa/m.(3)When the shear displacement is small,the normal displacement tends to reach a stable value with an increasing number of cycles.When the shear displacement is large,the normal displacement decreases continuously with an increasing number of cycles,but the changes in the shear stress,shear dilation angle and other parameters have already stabilized.It indicates that the influences of wear within a certain range on the mechanical properties of the joint surface are limited.(4)The change in the shear dilation angle is related to the morphology of joint surfaces.It decreases continuously with an increase in the cyclic times and finally tends to stabilize.关键词
岩石力学/剪切试验/节理面/循环剪切/剪胀角Key words
rock mechanics/shear test/joint surface/cyclic shear/shear dilation angle分类
建筑与水利引用本文复制引用
叶思哲,张强,李涛,代万里,时林坡,王红英..循环荷载下粗糙节理剪切力学特性与剪切行程的关系研究[J].岩土工程学报,2025,47(8):1653-1661,9.基金项目
国家自然科学基金项目(52074269)This work was supported by the National Natural Science Foundation of China(Grant No.52074269). （52074269）
