接触行为对颗粒材料中应力波波速与能量的影响

采用离散单元法，研究线弹性接触模型、Hertz接触模型、线性平行粘结模型对不同排列颗粒材料中波传播的影响，分析了三种接触模型下波的波速变化和能量变化，同时也研究了弹性模量对颗粒材料中波传播的影响.最后对颗粒材料样本采用Hertz接触模型，探究了不同围压条件下颗粒材料中波的波速变化和能量衰减.研究结果表明:不同接触模型下波传播的波速和能量衰减率不同;当颗粒样本从规则排列到随机排列，波传播的波速变小，能量衰减率变大;随着颗粒弹性模量的增大，波速呈对数增大;在波传播过程中能量快速耗散，随着围压的增大，波速和能量衰减率都增大.

Influence of Contact Behavior on Stress Wave Velocity and Energy in Granular Materials

The discrete element method is used to study the energy attenuation and wave velocity change of granular system in the process of wave propagation with linear-elastic contact model， Hertz contact model and linear parallel bond contact model. Meanwhile， the influences of elastic modulus on wave propagation in granular materials are also studied. Finally， the Hertz contact model is used to study the wave velocity and the energy attenuation of granular materials under different confining pressures. The results show that the wave velocity and energy attenuation rate of wave propagation are different with different contact models; when the sample is arranged from regular to random， the wave velocity is smaller and the energy attenuation rate is larger; with the increase of elastic modulus of particles， the wave velocity increases logarithmically; in the process of wave propagation， the energy dissipates rapidly， and with the increase of confining pressure， the wave velocity and energy attenuation rate both increase.