Time effect and prediction of broken rock bulking coefficient on the base of particle discrete element method  

作　　者：Fanfei Meng Hai Pu Takashi Sasaoka Hideki Shimada Sifei Liu Tumelo KM Dintwe Ziheng Sha 

机构地区：[1]Department of Earth Resources Engineering,Faculty of Engineering,Kyushu University,Fukuoka 819-0395,Japan [2]State Key Laboratory for Geomechanics&Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116,China [3]College of Mining Engineering and Geology,Xinjiang Institute of Engineering,Urumqi 830023,China

出　　处：《International Journal of Mining Science and Technology》2021年第4期643-651,共9页矿业科学技术学报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China,NSFC(Nos.U1803118 and 51974296)and the China Scholarship Council(CSC)(award to Fanfei Meng for PhD period at Kyushu University).

摘　　要：Bulking characteristics of gangue are of great significance for the stability of goafs in mining overburden in the caving zones.In this paper,a particle discrete element method with clusters to represent gangue was adopted to explore the bulking coefficient time effect of the broken rock in the caving zone under three-dimensional triaxial compression condition.The phenomena of stress corrosion,deformation,and failure of rock blocks were simulated in the numerical model.Meanwhile,a new criterion of rock fragments damage was put forward.It was found that the broken rock has obvious viscoelastic properties.A new equation based on the Burgers creep model was proposed to predict the bulking coefficient of broken rock.A deformation characteristic parameter of the prediction equation was analyzed,which can be set as a fixed value in the mid-and long-term prediction of the bulking coefficient.There are quadratic function relationships between the deformation characteristic parameter value and Talbot gradation index,axial pressure and confining pressure.

关 键 词：Bulking coefficient Time effect Deformation prediction Broken rock Particle discrete element model 

分 类 号：TD31[矿业工程—矿井建设]