文献类型：期刊文献

中文题名：单轴压缩试验端面摩擦效应及损伤演化规律研究

英文题名：Study on friction effect and damage evolution of end face in uniaxial compression test

作者：Li, Shanlin[1]; Liu, Guangjian[1]; Jia, Ruifeng[1]; Xue, Fei[1]; Wang, Kangyu[1]

机构：[1] Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province, School of Civil Engineering, Shaoxing University, Shaoxing, 312000, China

年份：2021

卷号：3

期号：3

外文期刊名：Journal of Mining and Strata Control Engineering

收录：EI(收录号：20241015701049)

语种：中文

外文关键词：Brittle fracture - Compression testing - Compressive strength - Crack propagation - Friction - Lithology - Mining - Sandstone - Shear flow - Software testing - Stress concentration - Stress-strain curves

外文摘要：The end friction effect in uniaxial compression test has a great influence on the deformation and failure characteristics of the specimen. Based on the Coulomb slip criterion, numerical tests of uniaxial compression under different end friction coefficients are carried out by using UDEC software. The deformation and failure of the specimens with different lithology and different aspect ratios are studied. The mechanism of the end friction effect is explored from the angle of the stress-strain relationship, crack propagation and stress distribution. The results show that:① The end friction effect can inhibit the initiation and propagation of micro cracks, and change the failure mode of brittle samples from splitting to shear or tension shear joint failure, which makes the strength of sandstone increase significantly, and has little effect on the strength of coal and mudstone;② There is a threshold value for the effect of end friction on the strength and failure characteristics of the samples. The threshold values of the end friction coefficient of the 50 mm×100 mm standard coal, mudstone and sandstone samples are 0.2, 0.2 and 0.5, respectively;③ The results show that the size effect of specimen strength at different heights is mainly caused by "crack triangle inhibition zone" and local stress concentration zone caused by end friction. It is suggested that the friction reduction measures should be taken to avoid the end friction effect in the indoor uniaxial compression test. ? 2021, Editorial Office of Journal of Mining and Strata Control Engineering. All right reserved.