Analysis of influence of stress wave disturbance on anomalously low friction effect in sandstone block
LI Liping1，TANG Lei1，PAN Yishan2，JU Xiangyu1，ZHANG Haitao1，LI Minghui1
(1. School of Mechanics and Engineering，Liaoning Technical University，Fuxin，Liaoning 123000，China；2. School of Physics，Liaoning University，Shenyang，Liaoning 110036，China)
Abstract：Taking the sandstone block as the research object，the anomalously low friction effect of sandstone block under the condition of stress wave disturbance in vertical direction was studied by using the self-developed anomalously low friction test device. The stress environment of the deep block was simulated by using the coaction of vertical stress wave disturbance，vertical axial pressure and horizontal impact. The influence law of stress wave disturbance frequency and amplitude on anomalously low friction effect of sandstone block was analyzed. The results show that under the coaction of vertical stress wave disturbance，vertical axial pressure and horizontal impact the sandstone block?s instability process of anomalously low friction sliding can be divided into four stages: stress wave disturbance stage，anomalously low friction accelerated sliding stage，unsteady sliding stage and stable sliding stage. Vertical direction stress wave disturbance is not only the key factor to bring out the anomalously low friction effect，but also the catalyst to induce the anomalously low friction effect. The low-frequency significant influence zone was found that is，when the stress wave disturbance frequency is in 1 ‐3 Hz scope，the anomalously low friction effect in sandstone block occurred most obviously. Under the same horizontal impact，the relationship between the horizontal displacement，the peak value of the horizontal acceleration of the sandstone working block and the intensity of vertical stress wave disturbance is linear.
2021, Vol. 40 
