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Particle flow code simulation of intact and fissured granitic rock samples

Journal of Rock Mechanics and Geotechnical Engineering 2020年第5期12卷 960-974页

作者： Uxía Castro-Filgueira Leandro R.Alejano Diego Mas Ivars Department of Natural Resources and Environmental Engineering University of VigoVigoSpain Department of Geology and Geological Engineering Colorado School of MinesGoldenCOUSA Swedish Nuclear Fuel and Waste Management Company(SKB) StockholmSweden Division of Soil and Rock Mechanics Royal Institute of Technology(KTH)StockholmSweden

This study presents a calibration process of three-dimensional particle flow code(PFC3D)simulation of intact and fissured granite ***,laboratory stressestrain response from triaxial testing of intact and fissured granite samples is ***,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 ***,models of the pre-fissured rock specimens were generated,including modeled fissures in the form of“smooth joint”type ***,triaxial testing simulations of 1 t 2 and 2 t 3 jointed rock specimens were *** show that both elastic behavior and the peak strength levels are closely matched,without any additional fine tuning of micro-mechanical *** the postfailure behavior,models reproduce the trends of decreasing dilation with increasing confinement and ***,the dilation values simulated are larger than those observed in *** 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

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Distinct element method analysis and field experiment of soil resistance applied on the subsoiler

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International Journal of Agricultural and Biological Engineering 2014年第1期7卷 54-59页

作者： Li Bo Liu Fanyi Mu Junying Chen Jun Han Wenting College of Mechanical and Electronic Engineering Northwest A&F UniversityYanglingShaanxi 712100China

Since the design of the subsoiler is a complex work,the interaction between the subsoiler and soil was investigated by using Distinct Element Method(DEM)in this *** on the traditional discrete element theory,the 3D model of soil particles and the subsoiler were established after considering the liquid bridge force between soil *** operating resistance curves of the subsoiler were achieved after the DEM simulation at a speed of 1 m/s,and three depths of 180 mm,220 mm and 260 mm,*** simulation curves agreed well with the field experimental results based on relative errors of 2.96%,14.95%and 7.15%,respectively,at three *** these data proved that it was feasible and favorable to analyze the performance of the subsoiler by using the DEM and it is of important significance for studying and further optimizing the structure of the subsoiler.

关键词： distinct element method(DEM) parallel bond subsoiler modeling simulation

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