波动法确定河床覆盖层动力特性参数的试验研究

Test study on dynamic behavior parameters of river overburden by wave method

波动法确定覆盖层的动力参数是通过测定覆盖层的纵波速度Vp和横波速度Vs,用波动理论方程求解得出的。声波传播速度与波的频率相关,一般是高频率,短波长,其探测距离较短,而地震波传播速度几乎与频率无关,且探测距离较长,因此用地震波勘探技术就可以较为准确地测定覆盖层的纵波速度和横波速度。

The dynamic parameters are determined by means of measuring longitudinal wave velocity （ Vp ） and transverse wave velocity （ Vs ） of the overburden, which is derived from the wave theoretical equation. Sound wave propagation velocity is correlated to wave frequency, generally with high frequency, long shortwave and shorter detection distance, whereas seismic wave propagation velocity almost has no relation with frequency and the detection distance is longer. So, seismic wave exploration technique will be applied to rather accurately set out longitudinal and transverse wave velocities of the overburden.