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测量了2种岩块的垂直和平行于层理面两个方向的超声波速,数据表明平行于层理面方向及其法线方向具有很明显的波速各向异性,即平行于层理面方向的波速各方向数值近似相等且大于垂直于层理面方向波速。基于此,建立层状岩石的横观各向同性介质模型。根据横观各向同性介质波动理论,结合波速、波幅的变化规律分析,通过纵波探头平测法,测试了有较大平面的岩块横波在层理面内的偏振波速。在椭圆近似假设的基础上,即声波的横向的各向同性,其他方向各向异性以及纵横向之间按椭圆规律变化,简化了关于横向各向同性岩石动力参数的计算,得到了仅利用纵波探头测量4种波速即可近似地反演出横向各向同性岩石5个独立参数的结论。这对层状的岩体中的工程动力计算有其积极意义。
The ultrasonic velocities of two kinds of rock mass were measured both vertically and parallel to the bedding plane. The data show that there is a significant wave velocity anisotropy parallel to the bedding plane direction and its normal direction, ie parallel to the bedding plane direction The wave velocities in each direction are approximately equal and larger than the wave velocities in the direction perpendicular to bedding plane. Based on this, a transversely isotropic medium model of layered rock is established. According to the transverse isotropic medium wave theory and the analysis of the variation of wave velocity and amplitude, the wave velocity of the plane shear wave in the plane of bedding plane is tested by the longitudinal wave probe method. On the basis of ellipse approximation assumption, that is, transverse isotropy of sound wave, anisotropy in other directions and ellipse rule change between vertical and horizontal directions, the calculation of dynamic parameters of transversely isotropic rock is simplified, The measurement of four wave velocities by the probe can approximate the conclusion of 5 independent parameters of transversely isotropic rocks. This has positive significance for engineering dynamic calculation in layered rock masses.