【摘要】 在花岗岩型高放废物地质处置库中,花岗岩中裂隙带的发育程度直接影响到预选区的稳定性和安全性,必须及时有效地探测出裂隙带的发育位置,而地震勘探方法是有效预测和确定裂隙带分布的地球物理勘探方法之一。利用交错网格高阶有限差分算法,采用完全匹配层吸收边界条件(PML),对不同厚度各向同性裂隙带和VTI型裂隙带进行了弹性波场数值模拟,获得裂隙带层状介质的波场快照和地震单炮记录,结果显示,弹性波在花岗岩各向同性和各向异性裂隙带中的传播特征几乎相同,然而随着裂隙带厚度的变化,波场的动力学特征会随之发生改变。更多还原

【Abstract】 In this study a high order finite difference algorithm is developed. The elastic wave numerical simulation of isotropic and VTI (transversely isotropic with a vertical symmetry axis) fracture zone is processed with the absorbing boundary condition for perfectly matched layers (PML) under the different thickness. The wave field snapshot and single shot record of fracture zone layered medium is obtained. The results show that elastic wave propagation present no obvious differences between isotropic and Anisotropy fracture zone in granite. The dynamic characteristics of wave field could alter with the changes of fracture zone thickness.更多还原