基于颗粒流的双齿型结构面剪切特性影响因素分析

Analysis for Influence Factor of Shear Characteristics of Double Saw-tooth Structure Plane Based on Particle Flow Code

国内外学者主要研究了多齿型结构面,但对于双齿型结构面的研究不够深入。为了探究双齿型结构面剪切特性的影响因素和规律,首先对比了单轴压缩试验结果与颗粒流计算结果,得到了较准确的细观参数,然后基于该细观参数和颗粒流程序建立了不同法向应力、齿高和齿距的颗粒流直剪试验数值模型,并从峰值抗剪强度和峰值摩擦角的角度对结果进行了分析。试验结果表明:峰值抗剪强度与法向应力、齿高皆呈现出正相关;峰值抗剪强度随齿距的增大而减小;峰值摩擦角随着法向应力和齿距的增大而减小;峰值摩擦角随齿高的增大而增大。

Many scholars at home and abroad had studied the multi-tooth structure plane,but the research on the double-tooth structure plane is not enough.In order to study the influence rule and factor for shear characteristics of through-going double tooth structure plane,the experiment data of uniaxial compression test and particle flow code simulation were compared,the micromechanical parameters of numerical model were obtained.Based on the microscopic parameters and the program,the numerical simulation models under different normal stress,different height and different spacing of direct shear test were established,the date was analysed from the point of view of peak shear strength and peak friction angle.The results show that the peak shear strength increases with the increase of normal stress and tooth height,the peak shear strength increases with the increase of tooth spacing.The peak friction angle decrease with the increase of normal stress and tooth spacing,increasing with the increase of tooth height.