Particle flow code simulation of intact and fissured granitic rock samples  

作　　者：Uxía Castro-Filgueira Leandro R.Alejano Diego Mas Ivars 

机构地区：[1]Department of Natural Resources and Environmental Engineering,University of Vigo,Vigo,Spain [2]Department of Geology and Geological Engineering,Colorado School of Mines,Golden,CO,USA [3]Swedish Nuclear Fuel and Waste Management Company(SKB),Stockholm,Sweden [4]Division of Soil and Rock Mechanics,Royal Institute of Technology(KTH),Stockholm,Sweden

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2020年第5期960-974,共15页岩石力学与岩土工程学报（英文版）

基　　金：The University of Vigo is acknowledged for financing part of the first author’s PhD studies;the Spanish Ministry of Economy and Competitiveness for funding of the project‘Deepening on the behaviour of rock masses:Scale effects on the stressestrain response of fissured rock samples with particular emphasis on post-failure’,awarded under Contract Reference No.RTI2018-093563-B-I00;partially financed by means of European Regional Development Funds from the European Union(EU)。

摘　　要：This study presents a calibration process of three-dimensional particle flow code(PFC3D)simulation of intact and fissured granite samples.First,laboratory stressestrain response from triaxial testing of intact and fissured granite samples is recalled.Then,PFC3D is introduced,with focus on the bonded particle models(BPM).After that,we present previous studies where intact rock is simulated by means of flatjoint approaches,and how improved accuracy was gained with the help of parametric studies.Then,models of the pre-fissured rock specimens were generated,including modeled fissures in the form of“smooth joint”type contacts.Finally,triaxial testing simulations of 1 t 2 and 2 t 3 jointed rock specimens were performed.Results show that both elastic behavior and the peak strength levels are closely matched,without any additional fine tuning of micro-mechanical parameters.Concerning the postfailure behavior,models reproduce the trends of decreasing dilation with increasing confinement and plasticity.However,the dilation values simulated are larger than those observed in practice.This is attributed to the difficulty in modeling some phenomena of fissured rock behaviors,such as rock piece corner crushing with dust production and interactions between newly formed shear bands or axial splitting cracks with pre-existing joints.

关 键 词：Numerical methods Artificially fissured samples Rock mass behavior Particle flow code Parallel bond Flat-joint Smooth-joint 

分 类 号：TU45[建筑科学—岩土工程]