Particle Flow Simulation on Influence of Joint Roughness Coefficient on Stress Wave Propagation and Specimens Failure
Received date: 2020-08-03
Revised date: 2020-10-15
Online published: 2021-05-28
In order to study the effect of joint roughness coefficient（JRC） on stress wave propagation and the mechanism of failure of rough joint rock specimens under stress wave action，a numerical model of particle flow code in a split Hopkinson pressure bar（SHPB） system was established by using PFC2D，a numerical analysis software based on discrete element method. Based on the existing SHPB physical test，the microcosmic parameters of joint rock specimens were demarcated. By comparing the waveforms of incidence，transmission and reflection generated by physical test and numerical simulation，the microscopic parameters were adjusted until the waveforms were basically the same，so that the correctness of the numerical model was verified. The numerical model was used to study the influence of JRC on stress wave propagation under low impact load and the microcosmic crack propagation and failure mechanism of joint rock specimens with different morphology under high impact load. In addition，the stress balance at both ends of the specimen under low impact load was analyzed by using the stress balance factor and the stress variation with time at the incident end and transmission end of the specimen. The typical stages of stress change at both ends of joint rock specimen and complete specimen in numerical impact test were compared and analyzed to explain the delayed effect of stress wave on joint surface and the effect of joint roughness on the increase of stress at the incident end. The results show that the presence of joint surface can reduce the transmission coefficient of stress wave，and the larger the JRC value of joint rock specimen is，the smaller the transmission coefficient is，and the stronger the reflected wave of the joint surface is，the more obvious the effect of stress growth slowing down at the incident end of the specimen is. Under impact load，the crack initiation occurs at the joint surface and spread rapidly to the whole part of the specimen，especially the end surface of the specimen，most of the cracks are formed in the post-peak stage，and tensile cracks are dominant. The rougher the joint surface is，the lower the dynamic strength is，the more easily the specimen is destroyed and the more cracks are produced.
Key words： SHPB; PFC; numerical simulation; JRC; stress wave propagation; transmission coefficient
Weihua WANG , Jie LUO , Tian LIU , Zhenyu HAN . Particle Flow Simulation on Influence of Joint Roughness Coefficient on Stress Wave Propagation and Specimens Failure[J]. Gold Science and Technology, 2021 , 29(2) : 208 -217 . DOI: 10.11872/j.issn.1005-2518.2021.02.143
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