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在工程建设中经常会遇到诸如溶洞、裂隙带和断层破碎带等不良地质体,如果不能提前探明地下是否存在不良地质体及其含水情况,将会埋下严重的安全隐患。钻孔雷达是一种十分有效的探测方法,但迄今,尚未见有针对典型不良地质体进行正演模拟并进行复信号分析的工作。结合复信号分析技术,利用振幅、相位和频率等瞬时信息对钻孔雷达探测结果进行综合分析,能够提高解译的精度和准确性。针对溶洞、裂隙和断层等典型不良地质体无水和含水的情况分别建立了数值模型,利用地质雷达正演软件GprMax对数值模型进行了正演模拟,并使用复信号分析技术对正演结果进行了分析,获取了典型不良地质体的响应特征,且当不良地质体含水时,反射信号振幅增强、相位反转、频率降低。结合工程实例对钻孔雷达探测数据进行了复信号分析,正演模拟和工程实例都表明,利用复信号分析技术,可以更加方便地对地质异常体的形态分布及其含水情况进行分析,提高了钻孔雷达解译的精度和准确性。
In engineering construction, often encountered such as karst caves, fractured zone and fault rupture zone and other adverse geological body, if you can not ascertain the existence of underground geological conditions and their water content in advance, will lay a serious security risk. Drilling radar is a very effective detection method, but up to now, there have not been any typical adverse geological body for forward modeling and complex signal analysis. Combined with complex signal analysis techniques, the comprehensive analysis of borehole radar detection results using instantaneous information such as amplitude, phase and frequency can improve the accuracy and accuracy of interpretation. A numerical model was set up for the water and water of typical adverse geological bodies such as karst caves, fissures and faults. The numerical model was simulated by using GprMax, a forward modeling software of GPR, and the positive result was analyzed by complex signal analysis After the analysis, the response characteristics of the typical adverse geological body were obtained. And when the bad geological body was watery, the amplitude of the reflected signal increased, the phase reversed and the frequency decreased. Combined with engineering examples, the complex signal analysis of borehole radar detection data is carried out. Both forward modeling and engineering examples show that the use of complex signal analysis technology can more conveniently analyze the morphological distribution and water content of geological anomalies, Accuracy and accuracy of interpretation of borehole radar.