应力波扰动对砂岩块体超低摩擦效应影响分析  

Analysis of influence of stress wave disturbance on anomalously low friction effect in sandstone block

作　　者：李利萍[1] 唐垒 潘一山[2] 鞠翔宇 张海涛 李明会 LI Liping;TANG Lei;PAN Yishan;JU Xiangyu;ZHANG Haitao;LI Minghui(School of Mechanics and Engineering,Liaoning Technical University,Fuxin,Liaoning 123000,China;School of Physics,Liaoning University,Shenyang,Liaoning 110036,China)

机构地区：[1]辽宁工程技术大学力学与工程学院,辽宁阜新123000 [2]辽宁大学物理学院,辽宁沈阳110036

出　　处：《岩石力学与工程学报》2021年第S01期2773-2780,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51974148);辽宁省“兴辽英才计划”项目(XLYC1807130)。

摘　　要：以砂岩块体为研究对象,利用自主研制的超低摩擦试验装置,进行垂向应力波扰动条件下砂岩块体超低摩擦效应试验研究。通过对砂岩块体施加垂向应力波扰动、垂向轴压和水平冲击共同作用,模拟深部岩体所处应力环境。分析垂向应力波扰动频率、应力波扰动振幅对砂岩工作块体超低摩擦效应影响规律。研究结果表明:垂向应力波扰动、垂向轴压和水平冲击共同作用下砂岩块体超低摩擦滑动失稳过程分为应力波扰动、超低摩擦加速滑动、非稳定滑动、稳定滑动4个阶段。垂向应力波扰动作用既是块体发生超低摩擦效应的关键因素,又是诱发块体发生超低摩擦效应的催化剂。应力波扰动频率对砂岩工作块体超低摩擦效应存在低频显著影响区,应力波扰动频率在1~3 Hz低频时,砂岩工作块体超低摩擦效应最为明显。相同水平冲击作用下,砂岩工作块体水平位移、水平加速度峰值与应力波扰动强度间均呈线性关系。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.

关 键 词：岩石力学 应力波扰动 砂岩块体 冲击地压 超低摩擦效应 扰动频率 扰动强度 

分 类 号：TU45[建筑科学—岩土工程]