岩块间软弱介质对块系岩体摆型波传播影响试验研究  

Experimental study on the influence of weak medium in block rock mass partings on the pendulum wave propagation

作　　者：王凯兴[1,2] 薛佳琪 潘一山 窦林名[2] 贾宝新[1] WANG Kaixing;XUE Jiaqi;PAN Yishan;DOU Linming;JIA Baoxin(School of Mechanics and Engineering,Liaoning Technical University,Fuxin 123000,China;Key Laboratory of Deep Coal Resource Mining(CUMT)Ministry of Education,China University of Mining Technology,Xuzhou 221116,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]中国矿业大学深部煤炭资源开采教育部重点实验室,江苏徐州221116

出　　处：《振动与冲击》2022年第24期298-304,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(51874163);中国博士后科学基金(2017M611951);辽宁省“兴辽英才计划”项目资助(XLYC2007021);辽宁工程技术大学学科创新团队资助项目(LNTU20TD-08;LNTU20TD-19)。

摘　　要：块系岩体由岩块及岩块间软弱介质组成,块系岩体中存在一种非线性摆型波动力传播现象。摆型波在块系岩体中低频低速大摆幅传播,其中岩块间软弱介质是影响摆型波动力传播特性的重要因素。基于块系岩体摆型波动力传播试验模型,分析在一定冲击能量作用下岩块间软弱介质弹模及厚度对块系岩体摆型波动力传播的影响。从波动传播速度、块体加速度、动能、位移的时域和频域响应等方面进行分析。结果表明:当岩块间软弱介质弹模较大时摆型波传播速度较快,块体加速度及动能幅值较大,但位移幅值有所降低,加速度信号响应时宽明显变小,同时在摆型波传播过程中块体加速度、动能和位移的最大值衰减率均明显提高,而随着夹层弹模的增大两测点加速度频域响应带宽、中心频率及最值频率都随之增大,块体振动频率升高;岩块间软弱介质越厚摆型波传播速度越慢,同时块体动能及位移幅值增大,加速度信号时宽呈增大趋势,动能及位移的衰减更明显,加速度衰减率有小幅增加,加速度频域响应带宽及中心频率均随之减小,块体振动频率有所下降。综合软弱介质弹模和厚度两个因素当岩块间弱介质弹模下降或厚度增大时摆型波低频低速传播特性将表现得更为突出,该文章的研究将对块系岩体动力响应特征分析及岩体工程波动监测提供参考。Block rock mass is composed of rock and weak medium between them,so there is a nonlinear dynamic propagation of pendulum wave in block rock mass.The propagation of pendulum wave is low frequency,low speed and large amplitude.Among them,weak medium between rock blocks is an important factor that affects the dynamic propagation characteristics of pendulum wave.This paper is based on the experiment of dynamic propagation of pendulum wave in block rock mass.The influence of elastic modulus and thickness of weak medium between rock blocks on the dynamic propagation of pendulum wave in block rock mass under a certain impact energy was analyzed.The time and frequency domain responses of wave propagation velocity,block acceleration,kinetic energy,and displacement were obtained.Results show that:when the elastic modulus of the weak medium between rock blocks is larger,the speed of pendulum wave is faster,the amplitude of acceleration and kinetic energy of the block is large,and the displacement amplitude decreases,and the response time width of acceleration signal decreases obviously.At the same time,the maximum attenuation rates of acceleration,kinetic energy,and displacement of the block increase significantly during the propagation of pendulum wave.With the increase of elastic modulus of the soft medium,the acceleration frequency domain response bandwidth,center frequency and maximum frequency of two measuring points increase,and the vibration frequency of the block increases.When the weak medium between blocks becomes thicker,the pendulum wave propagation speed becomes slower.The block kinetic energy and displacement amplitude increase,the time width of acceleration signal increases,the attenuation of kinetic energy and displacement is more obvious,the acceleration attenuation rate increases slightly,the acceleration frequency domain response bandwidth and center frequency decrease,and the block vibration frequency decreases.Considering the elastic modulus and thickness of weak medium,the low-frequency and low-speed p

关 键 词：块系岩体 摆型波 动力响应 岩石力学 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3