电极排列方式对堤防隐患的地电响应特征研究

Research on the Geoelectric Response Characteristics ofDifferent Electrode Arrangements to Dike Dangers

高密度电阻率法不同的电极排列方式对于同一隐患类型的地电响应特征不同,探究各排列方式对于特定隐患类型的地电反应特征是提高探测效果的重要环节。为研究高密度电法不同电极排列方式对堤防常见隐患类型的地电反应特征,通过构建数值模型,对于空气空洞、含水空洞和裂缝3种堤防常见隐患类型进行正演分析,研究了不同装置类型对常见隐患类型的地电反应特征;结合反演计算结果分析了不同装置类型对常见隐患类型的灵敏度和分辨率。结果表明,三种电极排列方式对于土体空气空洞和充水空洞探测效果整体较好,对于裂缝的探测深度不足;对于横向排列的隐患区的探测效果,探测分辨率随着两隐患区间距的增大而增大;对于竖向排列的两个隐患区则无法区分隐患数量。针对不同隐患的地电特征,结合实际工程进行了解译,提高了解译分辨率。

Different electrode arrangements of high-density resistivity method have different geoelectric response characteristics for the same hidden danger type.Exploring the geoelectric response characteristics of each arrangement for a specific hidden hazard type is an important link to improve the detection results.To research the geoelectric response characteristics of different electrode arrangements of high-density electric method to the common types of dike hidden dangers,forward modeling analysis was carried out for three common types of dike hidden dangers,including air cavities,water-bearing cavities and cracks.The geoelectric response characteristics of different electrode arrangement types to common hidden dangers are studied.The sensitivity and resolution of different electrode arrangements to common hidden dangers were analyzed based on the inversion calculation results.The results show that the three electrode arrangements are good for the detection of air cavities and water filled cavities in the soil,and the detection depth of cracks is insufficient.For the detection effect of horizontally arranged hidden danger areas,the detection resolution increases with the increase of the distance between the two hidden danger areas.For the two vertically arranged hidden danger areas,the number of hidden danger is yet to be distinguished.The geoelectric characteristics of different hidden dangers and their interpretation in the actual projects verify the interpretation resolution improvement.