摘要
摆型波是块系岩体中的一种非线性动力传播现象,为研究块系岩体中局部岩块断裂时的摆型波传播规律,采用试验方法研究了岩块的断裂方向和断裂位置对摆型波传播的影响,分别从摆型波的传播速度、岩块加速度、动能、位移响应及加速度频域响应特性等方面进行分析.结果表明:当岩块发生断裂时摆型波在块系岩体中的传播速度下降,岩块振动持续时间延长,岩块加速度和动能最值均出现下降,加速度信号中心频率下降,岩块位移的最大值出现增大;同时得出,岩块纵向断裂和在近冲击源位置断裂这2个因素对摆型波传播过程岩体动力响应特征的影响更大.该研究将为块系岩体存在局部岩块断裂时摆型波传播特征识别及岩体的断裂预警提供参考.
The phenomenon of pendulum-type wave is a nonlinear dynamic propagation in block rock mass. The influence of local block fracture direction and fracture position to pendulum-type wave propagation is studied by experiments. In this paper,the propagation velocity of pendulum-type wave,block rock acceleration,kinetic energy,displacement response and acceleration frequency domain response characteristics of rock blocks are analyzed respectively. The results show that when the rock block fractured,the propagation velocity of pendulum-type wave in block rock mass decreased,the vibration duration of rock block prolonged,the maximum acceleration and kinetic energy of rock block decreased,the frequency domain center of the acceleration signal decreased,and the maximum displacement of rock block increased. At the same time,the longitudinal direction fracture of rock block and the fracture position near the impact source have greater influence on the dynamic response of rock mass during the propagation of pendulum-type wave. This study provides a reference for identifying the propagation characteristics of pendulum-type wave when block fractured and warning rock fracture.
作者
王凯兴
吴少弘
潘一山
窦林名
王学滨
WANG Kaixing;WU Shaohong;PAN Yishan;DOU Linming;WANG Xuebin(School of Mechanics and Engineering,Liaoning Technical University,Fuxin,Liaoning 123000,China;Key Laboratory of Deep Coal Resource Mining Ministry of Education,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2023年第2期267-275,共9页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(51874163)
中国博士后科学基金项目(2017M611951)
辽宁省“兴辽英才计划”项目(XLYC2007021)
辽宁工程技术大学学科创新团队资助项目(LNTU20TD-08,LNTU20TD-19)。
关键词
块系岩体
摆型波
岩块断裂
岩石动力学
block rock mass
pendulum-type wave
rock block fracture
rock dynamic
