A coarse-grained bonded particle model for large-scale rock simulation  

作　　者：Chengshun Shang Liping Li Kaiwei Chu Zongqing Zhou Guillermo Casas Wenfeng Tu Yuxue Chen Shangqu Sun 

机构地区：[1]School of Qilu Transportation,Shandong University,250061,Jinan,China [2]International Center for Numerical Methods in Engineering(CIMNE),08034,Barcelona,Spain [3]Universitat Politecnica de Catalunya(UPC),08034,Barcelona,Spain [4]Geotechnical and Structural Engineering Research Center,Shandong University,250061,Jinan,China [5]College of Civil Engineering and Architecture,Shandong University of Science And Technology,266590,Qingdao,China

出　　处：《Rock Mechanics Bulletin》2024年第4期58-69,共12页岩石力学通报（英文）

基　　金：supported by the National Science Foundation for Distinguished Young Scholars of China(Grant No.52025091);the Taishan Scholars Program(NO.tsqn202312192);the Youth Innovation Team of Shandong Higher Education Institutions(2022KJ214)。

摘　　要：For solving the computationally intensive problem encountered by the discrete element method(DEM)in simulating large-scale engineering problems,it is essential to establish a numerical model that can effectively simulate large-scale rocks.In this study,the coarse-graining effect of a linear-Mindlin with bonding model was studied in the unconfined compression strength(UCS)and Brazilian tensile strength(BTS)tests.We found that the main reason for the coarse-graining effect of the BTS tests is that the type I fracture toughness is positively correlated with the size of the particles.Based on the results analysis and fracture mechanics,the coarse-grained(CG)modeling theory was combined with a bonded particle model(BPM)for the first time and a coarse-grained bonded particle model(CG-BPM)was developed,which can be effectively used to model the tensile strength of large-scale rocks with different particle sizes.The excavation damage zone(EDZ)in an underground research laboratory(URL)was selected as an application case,which shows that the coarse-grained bonding model presented in this paper is more accurate and reliable than the traditional one in large-scale rock simulation,at least in the scenario where tensile failure is dominant.

关 键 词：Numerical simulation Discrete element method(DEM) Coarse-grained bonded particle model(CGBPM) Large-scale rock 

分 类 号：TU45[建筑科学—岩土工程]