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

International Journal of Mining Science and Technology

Ying Chen¹  Lin Luo²  Xibing Li³  Diyuan Li⁴  Yong Luo⁴  Jiadong Qiu⁵ 

[1] Center of Rock Mechanics and Geohazards, Shaoxing University, Shaoxing 312000, China;Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, China;School of Resources and Safety Engineering, Central South University, Changsha 410083, China;School of Resources and Safety Engineering, Central South University, Changsha 410083, China;Shenzhen Key Laboratory of Deep Underground Engineering Sciences and Green Energy, Shenzhen University, Shenzhen 518060, China;

关键词: Tensile strength;    PFC;    Shotcrete;    Fracturing behavior;    Rock interface;   

DOI  :  

来源: DOAJ

【 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.

【 授权许可】

Unknown