文献类型：期刊文献

英文题名：Experimental Study on Crack Propagation Law and Mechanism of the Pre-cracked Rock

作者：Guo, Pengfei[1];Sun, Dingjie[2];Xu, Feilong[1];Hu, Jinzhu[1];Zhao, Yongxu[1];Li, Zhikang[1]

机构：[1]Shaoxing Univ, Civil Engn Coll, Shaoxing 312000, Peoples R China;[2]Installat Engn Co LTD, CSCEC TH Div 7, Zhengzhou 450000, Peoples R China

年份：2023

外文期刊名：GEOTECHNICAL AND GEOLOGICAL ENGINEERING

收录：ESCI(收录号：WOS:001042478100002)、EI(收录号：20233214507989)、Scopus(收录号：2-s2.0-85166924012)、WOS

基金：AcknowledgementsThis study is supported by the National Natural Science Foundation of China (Grant No. 51904188).

语种：英文

外文关键词：Geotechnical engineering; Fracture mechanics; Direct shear test; Directional pre-cracked rock; Numerical simulation

外文摘要：The crack propagation law of pre-cracked rock has an essential influence on the overlying rock movement and the stability of roadway surrounding rock during mining. The surrounding rock stability of the mining field is severely affected by the mining pressure. However, the growth of pre-cracked rock cracks has a great influence on the mining pressure. So laboratory experiments and numerical simulations are used to study the crack propagation law and mechanism of pre-cracked rock with different pre-cracked rates. The results indicate that as the cutting rate gradually increases, the peak shear stress strength of the specimen decreases, and the time required for crack propagation from the beginning of loading decreases. Moreover, when the specimen contains a single-sided pre-crack, cracks initiate and propagate in both directions under shear stress, eventually forming a circular crack region. The size of the circular crack region gradually decreases with the increase of the cutting rate. This suggests that as the cutting rate increases, the influence of the fracture process on the integrity of the roadway roof gradually weakens. In the numerical simulation, microcracks develop in the specimen under the action of the shear stress, and the microcracks number decreases with the increase of the cutting rate. The numerical simulation results show good consistency with laboratory experimental results. The research results have important reference value for the stability control of gob-side entry and the popularization and application of non-pillar mining technology.