黄河大堤裂缝探测技术研究

堤坝裂缝部位与无裂缝部位之间存在明显的电性差异，为采用直流电法探测堤 良好的物理前提。本文着重研究了中间梯度法，对称四极剖面法和高密度电阻率法三种方法探测黄河大堤裂缝的原理及实施要点。分析表明，中间梯度法和对称四极剖面法的视电阻率曲线特征、高密度电阻率法的视电阻率等值线剖面图及等级断面图，可判定裂缝位置、埋深、下延深度及走向。探测实例说明，不垢探测结果是一致的，并与开挖结果相符合。

Study on Crack Detection Techniques in the Yellow River Dykes

hat exists of the electric characteristics difference between crack position and non-crack position of a dam provides the perfect physical basis for crack detection thr.ough direct current. The principle and key implementation points of three methods,i. e.,middle slope method,four symmetrical role section method and high density resistivity method,are stressed in the paper. The analysis shows that the position,depth,extension range and direction can be ascertained by the feature of apparent specific resistance curve through the middle slope method and four symetrical role section method, and the apparent specific resistance isopleth sectional drawing and rank cross-section graph. The actual detection demonstrates that the conclusion are consistent by different methods,and also corresponchg with excavated output.