Shear behaviours and roughness degeneration based on a quantified rock joint surface description  

作　　者：Shubo Zhang Gang Wang Yujing Jiang Changsheng Wang Feng Xu 

机构地区：[1]Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao 266590,China [2]College of Civil Engineering,Fujian University of Technology,Fuzhou 350118,China [3]Graduate School of Engineering,Nagasaki University,Nagasaki 852-8521,Japan

出　　处：《International Journal of Mining Science and Technology》2023年第10期1301-1316,共16页矿业科学技术学报（英文版）

基　　金：the financial support from the National Natural Science Foundation of China(Nos.52079077 and 52209141);the Natural Science Foundation of Shandong Province,China(No.ZR2021QE069).

摘　　要：The asperity wear of rock joints significantly affects their shear behaviour.This study discusses the wear damage of the asperities on the joint surface,highlighting the roughness degradation characteristics during the shear process.The direct shear experiment of artificial specimens containing rock joints was conducted under different normal stresses based on three-dimensional scanning technology.These experimental results showed the contribution of joint wear to roughness degeneration,such as the height,zone,and volume of asperity degeneration.The wear coefficient of the rock joint was obtained based on the volume wear of asperities in the laboratory experiment.The functional relationship between the friction coefficient and wear coefficient is subsequently determined.To quantitatively analyse the wear damage of a joint surface,a calculation method for determining the wear depth of the rock joint after shearing was proposed based on wear theory.The relationship between the ultimate dilation and wear depth was analysed.A coefficient m,which can describe the damage degree of the joint surface,and a prediction method of joint surface roughness after shearing are established.Good agreement between analytical predictions and measured values demonstrates the capability of the developed model.Lastly,the sensitivity factors on the wear depth are explored.

关 键 词：Rock joint ROUGHNESS Shear behaviour WEAR ASPERITY 

分 类 号：TD313[矿业工程—矿井建设]