摘要
基于饱和多孔介质波动理论平面波解,分析了频率对纵、横波速度和衰减的影响以及孔隙率、体积模量、渗透系数等参数对纵、横波速度的影响,得出了波速、衰减具有频散的特性及孔隙率是影响冻土波速的主要因素等结论,据此分析了冻土超声波测试中存在的动力学特性规律不明显的原因,并提出了改进建议.在饱和土波动理论分析的基础上,对高饱和土的纵、横波特性进行了分析,得出了完全饱和土和未完全饱和土之间的波速性态有很明显的差别,并据此解释了冻土超声波测试中的波速比和泊松比偏低问题.
Based on the solution of the wave equation for saturated porous medium under suppose of plane wave, the relations between the longitudinal or transverse wave velocities, attenuations and frequency are analyzed. The influences of the void ratio, the bulk modulus, the permeability coefficient to the longitudinal and transverse wave velocity are studied. As a result, the conclusion which the velocity and attenuation have attributes of dispersion and which the void ratio is the major factor to the wave velocity of the frozen soils is obtained. Based on such an analysis, the reason why the laws of kinetic character is obscure on the ultrasonic test for the frozen soils is found, and then several advice are put forward. On the Basis of analysis for the saturated soils, the longitudinal and transverse wave velocities of the unsaturated soils are studied. The differences of wave velocity between the completely saturated and incompletely saturated soils are presented, and then the phenomenon which the velocity ratio and the Poisson ratio are lower on the ultrasonic test is analyzed.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2003年第5期517-521,共5页
Journal of China Coal Society
关键词
冻土
饱和度
波速
频散
孔隙率
frozen soil
saturation
wave velocity
dispersion
void ratio
