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 Jinjin Tian;Dongjing Xu;Tianhao Liu

作者机构：College of Earth Sciences&EngineeringShandong University of Science and TechnologyQingdao 266590China 

出 版 物：《International Journal of Mining Science and Technology》 (矿业科学技术学报（英文版）)

年 卷 期：2020年第30卷第6期

页      面：777-783页

核心收录：

学科分类：081901[工学-采矿工程] 0819[工学-矿业工程] 08[工学] 

基　　金：supported by the financial support of the National Natural Science Foundation 山东省自然科学基金 the Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents Open Fund of State Key Laboratory of Coal Resources and Safe Mining Science and Technology Research Directive Plans of China National Coal Association 

主　　题：V-shaped fissure Fracturing process Overburden strata Coal mining 

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 *** 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 *** 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 ***,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 *** 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 *** crack failure modes can be summarized into two distinct *** study reported herein can provide a better understanding of the evolution of double V-shaped prefabricated fissures induced by coal mining.