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Coupled Eulerian-Lagrangian simulation of a modified direct shearapparatus for the measurement of residual shear strengths

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第5期13卷 1113-1123页

作者： Luke Tatnell Ashley P.Dyson Ali Tolooiyan GHD Group Pty.Ltd. TraralgonVIC3844Australia School of Engineering University of TasmaniaHobartTAS7001Australia

The simulation of large-strain geotechnical laboratory tests with conventional Lagrangian finite element method(FEM)techniques is often problematic due to excessive mesh *** multiple reversal direct shear(MRDS)test can be used to measure the residual shear strength of soils in a laboratory ***,modelling and simulation generally require advanced numerical methods to accommodate the large shear strains concentrated in the shear *** reality,when the standard direct shear(DS)apparatus is used,the MRDS method is prone to two major sources of measurement error:load cap tilting and specimen *** sources of error make it difficult or even impossible to correctly determine the residual shear *** paper presents a modified DS apparatus and multi-reversal multi-stage test method,simulated using the coupled Eulerian-Lagrangian(CEL)method in a finite element *** method was successful in evaluating equipment and preventing both load cap tilting and specimen loss,while modelling large-deformation behaviour that is not readily simulated with the conventional FEM or arbitrary Lagrangian-Eulerian(ALE)***,a modified DS apparatus was created for the purpose of analysing mixtures of organic materials found in an Australian *** results obtained from the modified DS CEL model in combination with laboratory tests show a great improvement in the measured residual shear strength profiles compared to those from the standard *** modified DS setup ensures that accurate material residual shear strengths are calculated,a factor that is vital to ensure appropriate soil behaviour is simulated for numerical analyses of large-scale geotechnical projects.

关键词： Coupled Eulerian-Lagrangian(CEL)simulation residual shear strength Multi-stage Direct shear(DS) Organic content Cohesive soil

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