Roughness characterization and shearing dislocation failure for rock-backfill interface  

作　　者：Meifeng Cai Zhilou Feng Qifeng Guo Xiong Yin Minghui Ma Xun Xi 

机构地区：[1]Key Laboratory of High-Efficient Mine and Safety of Metal Mines of Ministry of Education,Beijing 100083,China [2]Key Laboratory of Urban and Underground Space Engineering,University of Science and Technology Beijing,Beijing 100083,China [3]Shandong Gold Group Co,Ltd,Jinan 250102,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2024年第6期1167-1176,共10页矿物冶金与材料学报（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2021YFC3001302);the National Natural Science Foundation of China(No.52274072).

摘　　要：Shearing dislocation is a common failure type for rock–backfill interfaces because of backfill sedimentation and rock strata movement in backfill mining goaf.This paper designed a test method for rock–backfill shearing dislocation.Using digital image techno-logy and three-dimensional(3D)laser morphology scanning techniques,a set of 3D models with rough joint surfaces was established.Further,the mechanical behavior of rock–backfill shearing dislocation was investigated using a direct shear test.The effects of interface roughness on the shear–displacement curve and failure characteristics of rock–backfill specimens were considered.The 3D fractal dimen-sion,profile line joint roughness coefficient(JRC),profile line two-dimensional fractal dimension,and the surface curvature of the frac-tures were obtained.The correlation characterization of surface roughness was then analyzed,and the shear strength could be measured and calculated using JRC.The results showed the following:there were three failure threshold value points in rock–backfill shearing dis-location:30%–50%displacement before the peak,70%–90%displacement before the peak,and 100%displacement before the peak to post-peak,which could be a sign for rock–backfill shearing dislocation failure.The surface JRC could be used to judge the rock–backfill shearing dislocation failure,including post-peak sliding,uniform variations,and gradient change,corresponding to rock–backfill disloca-tion failure on the field site.The research reveals the damage mechanism for rock–backfill complexes based on the free joint surface,fills the gap of existing shearing theoretical systems for isomerism complexes,and provides a theoretical basis for the prevention and control of possible disasters in backfill mining.

关 键 词：rock–backfill ROUGHNESS correlation characterization shearing dislocation interface failure 

分 类 号：TD803[矿业工程—矿山开采]