摘要
为了验证探地雷达在查找基岩中断裂破碎带的有效性、以及进一步认识破碎带在探地雷达反射剖面上的表现特征,结合概率论和数理统计知识,通过设置断裂破碎带中介质的介电常数在一定空间范围内随机分布,建立了更为贴合实际的断裂破碎带模型,使用时域有限差分方法正演模拟其二维GPR反射剖面,较好地揭示了断裂破碎带的GPR剖面特征。通过对不同破碎程度和基岩具有不同介电常数的破碎带模型进行正演模拟,分析其正演GPR剖面的图像差异,较为深入地认识了断裂破碎带在GPR剖面上反映出的特征。最后,进一步引入工程实例,发现通过正演模拟揭示的断裂破碎带GPR剖面特征在断裂破碎带的实际探测剖面上也是存在的,说明通过正演模拟来指导实际资料的解释是现实可靠的。
In order to verify the validity of ground-probing radar in search for the fractured zone of bedrock and identify characteristics of its GPR profile, the authors built a fairly good fault zone model by assuming the dielectric constant of the fractured zone which is distributed randomly in a certain spatial range. Using finite - difference time-domain （ FDTD ） simulation method, the authors obtained the two-dimensional GPR forward profile of the fracture broken belt that can better reveal its features on the GPR profiles. Through simulating different fractured zone models with different crushing degrees or different bedrock dielectric constants, the authors are fully acquainted with their characteristics on GPR profiles. A practical example shows that characteristics of the fractured zone revealed in forward simulation also exist in the practical GPR detection profile. It can thus be concluded that the forward simulation is a practical and reliable means in providing supports for the interpretation of practical GPR profiles.
出处
《物探与化探》
CAS
CSCD
2006年第6期551-553,561,共4页
Geophysical and Geochemical Exploration
关键词
探地雷达
断裂破碎带
正演模拟
时域有限差分
ground penetrating radar
fractured zone
forward simulation
finite-difference time-domain
random distribution
