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1.绪言我们知道,在岩石中传播的纵波(P 波)速度是因构成矿物的层理、片理的排列形式而异的。在沉积岩和变质岩中,垂直于层理、片理方向传波的波速度较慢。另外,即使是肉眼看起来属各向同性的花岗岩等,也常常出现速度各向异性。关于这种速度各向异性,Siommons 等试用潜在的定向裂纹模型来说明,而 Anderson 等则算出了旋转椭圆体型裂纹定向排列情况下 Westerly 花岗岩的速度各向异性的数值解。对花岗岩中存在的细小裂纹,虽然可以借助显微镜直接观察,但对大多数孔隙来说,要测量其
1. INTRODUCTION We know that the speed of P waves propagating in rocks varies with the stratification of the minerals that make up the minerals, and the arrangement of the slices. In sedimentary rocks and metamorphic rocks, the wave velocity perpendicular to the bedding and filming direction is slow. In addition, speed anisotropy often occurs even in the isotropic granite and the like. For this speed anisotropy, Siommons et al. Tried to use a potential oriented crack model to illustrate, whereas Anderson et al. Calculated the numerical solution of the velocity anisotropy of Westerly granites in the case of rotationally elliptical cracks. For small cracks in the granite, though it can be directly observed with a microscope, but for most of the pores, to measure its