岩石粘性系数的测试方法  

Measuring Method for Viscosity Coefficient of Rock

作　　者：王观石[1] 郭媛[1] 胡世丽[1,2] 王星光[1] 

机构地区：[1]江西理工大学建筑与测绘工程学院,赣州341000 [2]中国地质大学工程技术学院,北京10083

出　　处：《地球物理学进展》2014年第5期2411-2415,共5页Progress in Geophysics

基　　金：国家自然科学基金资助项目(51104069);江西省自然科学基金项目(2010GQC0067);江西省教育厅科技项目(GJJ12339)联合资助

摘　　要：把岩石抽象为Kelvin粘弹性体,运用波动方程和复数理论建立应力波振幅随时间的衰减模型,提出基于测点特征波形振幅随时间衰减系数的岩石粘性系数现场测试方法.在岩石表面施加冲击载荷,布置传感器记录测点振动波形,分析应力波传播过程中频谱变化规律,由振动波形的第一特征频率确定有效带宽,通过带通滤波得到相应的特征波形,由测点特征波形振幅随时间的衰减系数计算岩石的粘性系数,并验证了计算结果的可靠性,为确定岩石力学参数提出了新方法.Rock was simplified as visco-elastic media.The attenuation model of seismic wave amplitude with time was studied using wave equation and complex number theory.Measuring method in situ for viscosity coefficient of rock was studied according to time attenuation coefficient of amplitude of characteristic wave shape of measuring point.Impact load was exerted to the surface of rock.The vibrating wave shape of surveying points is recorded by sensors in rock surface.Change rule of frequency spectrum of stress wave in the process of propagation is analyzed.Effective bandwidth is determined using the first characteristic frequency of vibration waveform.The corresponding characteristic wave shape was get by bandwidth filtering.Viscosity coefficient of rock is calculated analyzing the amplitude attenuation coefficient of characteristic wave shape with time.The reliability of calculation results is verified.A new method is put forward to determine the rock mass mechanical parameter.

关 键 词：应力波衰减 粘弹性体 粘性系数 特征波形 

分 类 号：P631[天文地球—地质矿产勘探]