Application and Analysis of Measurement Model for Calibrating Spatial Shear Surface in Triaxial Test

1st International Conference on Frontiers of Materials Synthesis and Processing

材料科学;化学

Zhang, Zhihua^1 ; Qiu, Hongsheng^1 ; Zhang, Xiedong^1 ; Zhang, Hang^1

School of Transportation, Wuhan University of Technology, Wuhan

430063, China^1

关键词: Analysis of measurements;    Assembling method;    Coordination number;    Large displacements;    Measurement model;    Particle distributions;    Theoretical values;    Three-dimensional model;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/274/1/012062/pdf
DOI  :  10.1088/1757-899X/274/1/012062

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Discrete element method has great advantages in simulating the contacts, fractures, large displacement and deformation between particles. In order to analyze the spatial distribution of the shear surface in the three-dimensional triaxial test, a measurement model is inserted in the numerical triaxial model which is generated by weighted average assembling method. Due to the non-visibility of internal shear surface in laboratory, it is largely insufficient to judge the trend of internal shear surface only based on the superficial cracks of sheared sample, therefore, the measurement model is introduced. The trend of the internal shear zone is analyzed according to the variations of porosity, coordination number and volumetric strain in each layer. It shows that as a case study on confining stress of 0.8 MPa, the spatial shear surface is calibrated with the results of the rotated particle distribution and the theoretical value with the specific characteristics of the increase of porosity, the decrease of coordination number, and the increase of volumetric strain, which represents the measurement model used in three-dimensional model is applicable.