围压影响堆石料剪切带的颗粒流模拟

为分析围压对堆石料剪切带的影响,基于颗粒流理论,构造三种不同形态的颗粒簇,建立了堆石料颗粒流模型。通过颗粒流数值模型双轴试验,研究了围压对堆石料剪切带结构的影响。结果表明,试样剪切带呈非对称X形分布,剪切带内颗粒旋转幅度随着围压的增加而增大,剪切带X形轮廓更加清晰。围压对试样颗粒位移影响较大,随着围压增大,颗粒位移不断增大,颗粒位移呈现出的X形剪切带逐渐消退。试样颗粒簇破碎过程与其宏观应力发展同步,剪切带内的颗粒比剪切带外的颗粒更易发生破碎。随着围压的增大,对试样内部颗粒的约束越强,发生局部破坏范围越小,导致试样内部X形剪切带的宽度逐渐变小。研究成果可为工程实践提供指导。

Particle Flow Simulation of Confining Pressure Affecting Shear Zone of Rockfill Materials

To analyze the influence of confining pressure on the shear zone of rockfill materials,based on the particle flow theory,three types of particle clusters with different shapes were constructed,and a rockfill particle flow model was established.The effects of confining pressure on the structure of the shear zone of rockfill materials were studied through a biaxial test of numerical model of particle flow.The results show that the shear band of the sample is asymmetrical Xshaped distribution,the particle rotation amplitude in the shear band increases with the increase of confining pressure,and the X-shaped contour of the shear band is clearer.The confining pressure has a greater impact on the particle displacement of the sample.As the confining pressure increases,the particle displacement continues to increase,and the Xshaped shear band shown by the particle displacement gradually subsides.The crushing process of sample clusters is synchronized with the development of macroscopic stress.Particles in the shear band are more likely to break than particles outside the shear band.With the increase of confining pressure,the stronger the restraint on the particles inside the sample,the smaller the range of local damage,and the width of the X-shaped shear band inside the sample gradually decreases.Research results can provide guidance for engineering practice.