复杂应力状态下岩石弹性波传播特性的研究

本文以探讨地下岩体处于三向不同应力状态下其内部弹性波的传播规律为目的,研究了两种不同致密程度的岩石(沙岩、灰岩),在单轴压力和三轴不同压力下,弹性波的传播特性和波速与应力的关系。结果表明,不同应力状态下岩石的弹性波速随应力的变化阶段与应变随应力的变化阶段大致相同,可分为三个变化阶段;对于处于弹性应力状态下的岩石,应力与弹性波速的关系可用不同的依赖系数线性表示。同时,对用弹性波法确定岩体地应力及水平构造应力进行了探讨。

THE STUDY ON CHARACTERISTICS OF ELASTIC WAVE PROPAGATION IN ROCKS UNDER COMPLICATED STRESS STATES

This paper is aimed at investigating the acoustic properties of rock mass under the three-dimentional different stress states, and is presented to discuss emphatically the characteristics of the acoustic wave propagation and the stress-velocity relation in both rocks (sandstone and limestone) under uniaxial and true triaxial compression. The results indicate three regions in which the acoustic velocities and the strains change with the stresses are approximately similar under different stress states; and the acoustic velocity-stress relations for elastic rocks may be represented by different interdependence coefficients under uniaxial compression. At a time, The acoustic measurement method of rock mass stresses and the horizontal tectonic stress are discussed.