An experimental investigation of the fracturing behaviour of rock-like materials containing two V-shaped parallelogram flaws  

作　　者：Jinjin Tian Dongjing Xu Tianhao Liu 

机构地区：[1]College of Earth Sciences&Engineering,Shandong University of Science and Technology,Qingdao 266590,China

出　　处：《International Journal of Mining Science and Technology》2020年第6期777-783,共7页矿业科学技术学报（英文版）

摘　　要：The distribution characteristics and evolution law of rock mass fissures induced by mining are a key scientific issue in the study of deep rock mechanics.In this study,a series of uniaxial compression experiments was conducted on rock-like specimens containing double V-shaped prefabricated fissures at dip angles ofα=β=45°,α=45°<b=60°,α=β=60°,andα=60°<β=75°with a rock mechanics servocontrolled testing system.According to the experimental results,the effects of the dip angles of the double V-shaped prefabricated flaws with the same area on the mechanical parameters and fracturing process of the specimens were analysed in detail.Additionally,the crack initiation stress presented a nearly linear growth trend,which is generally similar to that of the crack peak stress with increasing flaw dip angle.By applying photographic monitoring to the crack initiation,propagation,coalescence,and failure modes in rock-like specimens,it was easily seen that the V-shaped flaw properties slightly influence the crack initiation positions but significantly influence the crack trajectories.The crack failure modes can be summarized into two distinct types.The study reported herein can provide a better understanding of the evolution of double V-shaped prefabricated fissures induced by coal mining.

关 键 词：V-shaped fissure Fracturing process Overburden strata Coal mining 

分 类 号：TD313[矿业工程—矿井建设]