基于时移高密度电法的堤防隐患探测技术

Technology of Detecting Dyke’s Hidden Danger Using Time-lapse High-density Resistivity Method

为实现隐患险情的快速定位、预警,在对堤防隐患探测方法总结的基础上,介绍了时移探测技术的发展历程;从观测方法、数据采集与处理、反演成像、异常评判方法上对时移高密度电法的工作原理进行了阐述;通过构建数字模型对洞穴和渗漏2种常见堤防隐患开展三维正演数值模拟分析,研究了时移高密度电法在堤防隐患探测技术上的有效性;结合堤防工程实例对时移高密度电法动态探测技术开展了方法技术示范验证;针对堤防线路长和隐患具隐蔽性、突变性、持续性及低可探性,从观测系统、反演成像技术角度评估了时移探测技术在隐患险情灾变动态探测中的可能性。结果表明时移高密度电法在堤防隐患探测方面是可行的。

The development of time-lapse prospecting technology is briefed through summarizing the methods of detecting hidden dangers of dykes.The working principle of time-lapse high-density resistivity method is expounded from aspects of observation mode,data acquisition and processing,inversion and image rendering,as well as anomaly judgment method.The effectiveness of time-lapse high-density resistivity method in detecting hidden dangers of dyke is examined by 3D forward simulation of two typical hidden dangers,namely,cave and leakage.Moreover,pilot demonstration of the techniques of time-lapse high-density resistivity method is presented based upon engineering practice.Furthermore,the possibility of time-lapse prospecting technology in dynamic detection of hidden dangers of dyke are evaluated in conditions of long distance of dyke and concealing,abrupt,lasting,and lowly detectable dangers.