摘要
基于超声波在Kelvin-Vigot黏弹体传播过程中的幅值衰减规律,推导了岩石黏性系数的理论计算公式。通过室内岩样的超声波试验,获取不同发射波频率下的黏性系数。引入相关系数,进行岩石黏性系数与密度、波速、弹性模量的相关性分析。结果表明:岩石的黏性系数随超声波发射波的频率呈负指数函数关系;岩石的黏性系数对弹性模量的变化最为敏感,而对纵波波速的变化最不敏感,可用岩石的弹性模量来表征黏性系数;建立岩石黏性系数随发射波频率变化的统一拟合公式,拟合参数C1对弹性模量的变化最为敏感,拟合参数C2对纵横波波速比的变化最为敏感。研究成果可以为岩石力学参数测试和岩石动力学特性研究提供参考。
Based on the amplitude attenuation law of ultrasonic waves in the propagation process of KelvinVigot viscoelastic body,the theoretical calculation formula of viscosity coefficient for rock is derived.Through the ultrasonic test of indoor rock samples,the viscosity coefficient at different transmitted wave frequency is obtained.Correlation analysis is carried out to analyze the correlation between rock viscosity coefficient and density,wave velocity and elastic modulus.The results show that the viscous coefficient of rock is negatively exponential to the frequency of the incident wave.The viscosity coefficient of rock is most sensitive to the change of elastic modulus and least sensitive to the change of longitudinal wave velocity.The modulus of elasticity of the rock can be used to characterize the viscosity coefficient.A unified fitting formula for the viscosity coefficient of rock with the frequency of the incident wave is established.The fitting parameter C1 is most sensitive to the changes in elastic modulus and the fitting parameter C2 is most sensitive to the changes in the ratio of P-wave to S-wave.The research results can provide reference for rock mechanics parameter testing and rock dynamics research.
作者
孟世明
管华栋
王观石
MENG Shiming;GUAN Huadong;WANG Guanshi(School of Architectural and Surveying&Mapping Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)
出处
《中国矿业》
北大核心
2020年第5期162-166,共5页
China Mining Magazine
基金
国家自然科学基金项目资助(编号:41462009)
江西理工大学人才培养项目资助(编号:3401223395)
江西省教育厅科学技术研究项目资助(编号:GJJ190499)。
