文献类型：期刊文献

中文题名：预裂裂纹对岩石试件应力分布及变形规律的影响

英文题名：On Influence of Pre-crack on Stress Distribution and Deformation of Rock Specimens

作者：孙鼎杰[1];郭鹏飞[2]

机构：[1]绍兴文理学院土木工程学院;[2]绍兴文理学院岩石力学与地质灾害实验中心

年份：2019

卷号：39

期号：7

起止页码：25

中文期刊名：绍兴文理学院学报

收录：国家哲学社会科学学术期刊数据库

语种：中文

中文关键词：预裂裂纹;应力分布;变形规律;岩石强度;数值模拟

外文关键词：pre-splitting crack;stress distribution;deformation rule;rock strength;numerical simulation

中文摘要：为了得到岩石预裂裂纹的最佳长度,基于Griffith强度理论,通过FLAC3D数值仿真软件进行模拟实验,研究预裂裂纹长度分别为0 mm、20 mm、50 mm、80 mm、110 mm和140 mm 6组岩石在剪切实验中的变形及其应力分布规律.实验结果表明:当预裂裂纹长度小于80 mm时,岩石在X方向上的位移分布不均匀,应力在裂纹周围影响范围较大;当预裂裂纹长度大于等于80 mm时,岩石在X方向上的位移分布逐渐均匀,裂纹尖端应力集中逐渐增大,但应力集中影响范围大幅度减小,说明随着预裂裂纹长度不断增大,岩石强度显著降低.最终得到岩石预裂裂纹的最佳长度为岩石长度的53%～73%.

外文摘要：In order to get the best rock pre-splitting crack length, based on the theory of strength of Griffith, through the prefabricated crack sample shear experiments in the process of deformation and stress distribution, the different vertical presplit law of rock deformation and stress distribution of height were revealed. Through FLAC3D numerical simulation software, the deformation and stress distribution of six groups of rocks with pre-crack length of 0 mm, 20 mm, 50 mm, 80 mm, 110 mm and 140 mm were simulated. The experimental results show that when the crack length is less than 80mm, in the X direction, there is no uniform distribution in the rock's displacement, and the stress has a large influence on the crack area;when the crack length is greater than or equal to 80mm, in the X direction, rock displacement distribution is gradually uniform, with a gradual increase in the crack tip stress concentration and a great decrease in the influence of stress concentration range, indicating that the rock strength is significantly reduced as the length of the pre-cracking crack increases. Finally, the paper points out that the optimal length of the rock crack is 53% to 73% of the rock length.