Numerical investigation on the tensile fracturing behavior of rock-shotcrete interface based on discrete element method

作     者：Jiadong Qiu Lin Luo Xibing Li Diyuan Li Ying Chen Yong Luo Jiadong Qiu;Lin Luo;Xibing Li;Diyuan Li;Ying Chen;Yong Luo

作者机构：Shenzhen Key Laboratory of Deep Underground Engineering Sciences and Green EnergyShenzhen UniversityShenzhen 518060China Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment MonitoringMinistry of EducationCentral South UniversityChangsha 410083China School of Resources and Safety EngineeringCentral South UniversityChangsha 410083China Center of Rock Mechanics and GeohazardsShaoxing UniversityShaoxing 312000China 

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3期

页      面：293-301页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 0808[工学-电气工程] 08[工学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0807[工学-动力工程及工程热物理] 0815[工学-水利工程] 081304[工学-建筑技术科学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0813[工学-建筑学] 0814[工学-土木工程] 

基　　金：We acknowledge the financial supports of the National Natural Science Foundation of China(No.41630642) Project of Innovationdriven Plan in Central South University(No.2018CX020) the Funded by Open Research Fund Program of Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University),Ministry of Education(No.2017YSJS14) 

主　　题：Tensile strength PFC Shotcrete Fracturing behavior Rock interface 

摘      要：Four groups of numerical models of Brazilian tests on rock-shotcrete interfaces were successfully conducted by PFC2D. The tensile strength and Young’s modulus of shotcrete were considered. Six different undulations of rock-shotcrete interface were set up. The influences of multiple parameters on the bearing characteristics of the rock-shotcrete interface were studied. The results showed that a better support performance can be obtained by increasing the Young’s modulus of shotcrete rather than the tensile strength of shotcrete. For different tensile strength and Young’s modulus, the increase of sawtooth height has different effects on the support performance. The failure mechanism of the rock-shotcrete interfaces was analysed in detail. The stress shielding effect and stress concentration effect caused by the shape characteristics of rock-shotcrete interface were observed. The influence of these parameters on the overall support performance should be fully considered in a reasonable support design.