摘要
预制了含中心圆孔的不同倾角花岗岩裂隙试件,并开展了单轴压缩实验.以典型实验结果为基础,根据细胞自动机分析原理,构建了对应的应变软化模型,采用CASrock软件开展单轴压缩断裂力学特性研究.实验结果表明:数值模拟与实验结果吻合较好,裂隙倾斜方向与轴向应力夹角越小,则试件强度越大;预制裂隙倾角为0°时强度最小,90°时强度最大;在不同裂隙倾角下试件破坏模式有差异,倾角越小,张拉破坏特征越显著;倾角为0°时,圆孔顶端首先张拉起裂,而端部翼裂纹扩展滞后于张拉裂纹;倾角为45°时,张拉裂纹的扩展明显弱于翼裂纹;倾角为90°时,张拉破坏特征可以忽略,试件表现出沿裂纹端部的剪切破坏特征.实验结果验证了岩石抗拉能力弱于抗剪能力的事实,以及细胞自动机分析方法的可靠性,可为裂隙岩体力学性能研究及相关工程应用提供理论支撑.
Pre-crack samples of granite with different dip angles and a central circular hole were processed,and then uniaxial compression experiments were carried out in this paper.Based on the typical experimental results and the principle of cellular automata analysis,the corresponding strain softening models were established,and the fracture mechanical properties of samples under uniaxial compression were studied using CASrock software.Results show that the achievement obtained by numerical simulation and experiment are in good agreement with each other.The smaller the angle between the inclined direction of the crack and the axial stress,the greater the strength of the sample.The strength is minimum when the dip angle of the pre-crack is 0°,and maximum when the dip angle is 90°.The failure modes of samples are different under different fracture dip angles,the smaller the dip angle is,the more obvious the tensile failure characteristics are.When the dip angle is 0°,the tip of the hole is first tensioned and cracked,while the wing crack at the end of pre-crack lags behind the tension crack.When the dip angle of pre-crack is 45°,the growth of tension cracks is obviously weaker than that of wing cracks.When the dip angle is 90°,the tensile failure characteristics can be almost ignored,and the sample shows the shear failure characteristics along the crack tip.The results verify the fact that the tensile resistance of rocks is weaker than the shear resistance,and the reliability of cellular automata method,which can provide theoretical support for the research of mechanical properties of fractured rock masses and related engineering applications.
作者
田成
王其然
房智恒
胡方强
赵尔丞
张春阳
张雄天
邹平
TIAN Cheng;WANG Qiran;FANG Zhiheng;HU Fangqiang;ZHAO Ercheng;ZHANG Chunyang;ZHANG Xiongtian;Zou Ping(School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China;Zhongye Changtian International Engineering Co.,Ltd.,Changsha 410205,China;Pangang Group Mining Co.,Ltd.,Panzhihua 617000,China;Lanzhou Engineering&Research Institute of Nonferrous Metallurgy Co.,Ltd.,Lanzhou 730000,China;State Key Laboratory of Safety and Health in Metal Mines,Maanshan 243000,China;Sinosteel Maanshan General Institute of Mining Research Co.,Ltd.,Maanshan 243000,China;School of Resources and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;Zijin(Changsha)Engineering Technology Co.,Ltd.,Changsha 410036,China)
出处
《湘潭大学学报（自然科学版）》
CAS
2023年第5期37-44,共8页
Journal of Xiangtan University(Natural Science Edition)
基金
国家自然科学基金面上项目(52174088)。
关键词
花岗岩预制裂隙试件
细胞自动机原理
单轴压缩
数值模拟
破坏模式
pre-crack samples of granite
principle of cellular automata
uniaxial compression
numerical simulation
failure mode
