含裂隙介质受压破裂前地震波特性的综合实验研究与理论分析

本文用单轴压缩下砂岩试件的P、s波超声实验,对含裂隙高空度砂岩破裂前的Vp、Vs、Vp/Vs、Ap、As、As/Ap,初动段频谱,介质传递函数作了一系列实验研究。结果表明:l.Vp、Vs及Vp/Vs的变化同花岗岩,2.As/Ap要发生变化,3.有低频增加现象,4.介质传递函数发生变化,5.有第二P波产生。最后文章用两相介质中地宸波传播理论对实验结果作了定量分析。

EXPERIMENTAL STUDY AND THEORETICAL ANALYSIS OF SEISMIC WAVE CHARACTERISTICS BEFORE THE CRACK OF CRACKS AND PORE MEDIUM

In this paper, using the ultrasonic experiment of sandstone under uniaxial compression about P·S. wave, the variations of Vo Vs (velocities) Vp/Vs, Ap.As (amplitudes) As/Ap, initial frequency and midium transfer function before the crack of sandstone of high porosity have been studied The results are:1. Variation of Vp. Vs and Vp/Vs is the same as that of granite.2. Variation of Ap/As has taken place.3.The low frequency has increased.4. V ariation of medium transfer function has taken place 5 2-d P wave has been engendered.