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针对钻孔地质雷达探测工作中常见的空洞、岩溶和地下埋藏物等点状不良地质体,利用时域有限差分数值模拟方法,对岩土体内不同形状和不同埋深的目标地质体进行了雷达响应正演模型研究,并分析了这些模型的实际分辨能力和应用条件。结果表明,对于不同的探测任务,应根据感兴趣目标体的几何尺寸、分辨率要求等来选择合适的天线频率;不同几何形状的点状不良地质体所呈现的雷达剖面形式各异,且雷达反射信号强弱也不同;同一频率天线其探测分辨能力随空洞埋藏深度而变化,同一埋深下,天线频率越高,高度分辨能力效果越好。研究结果可为钻孔雷达用于岩体工程勘察、灾害隐患探测提供模拟图像认知和数据判读支持。
Aiming at the bad geological bodies such as voids, karsts and underground burial, which are common in the exploration of borehole geological radar, the target geological bodies of different shapes and burial depths in the rock mass are studied by the finite difference time-domain numerical simulation method In response to forward modeling studies, the actual resolution and application conditions of these models are analyzed. The results show that for different exploration tasks, the appropriate antenna frequency should be chosen according to the geometric size of the target of interest, the resolution requirement, etc. The radar profile presented by the point-shaped poor geological bodies with different geometric shapes presents different radar profiles The intensity of the reflected signal is also different. The detection resolution of the antenna with the same frequency varies with the buried depth of the hole. Under the same depth, the higher the antenna frequency is, the better the resolution of the antenna is. The results of this study can provide simulation image recognition and data interpretation support for borehole radar application in rock engineering investigation and disaster hazard detection.