地形起伏对高密度电法探测地下岩溶管道的影响试验研究

发布时间：2018-03-11 05:08

本文选题：地形起伏　切入点：谷地　出处：《工程地质学报》2017年01期 　论文类型：期刊论文

【摘要】：高密度电阻率法在岩溶区找水具有较好的效果,但岩溶区地形复杂,高密度电法受地形起伏影响较大。为了提高岩溶区高密度电法找水的勘探效果,掌握地形起伏对高密度电法影响的规律,本文采用高密度电阻率法微测系统,利用铜柱体模拟地下岩溶管道,研究地形起伏对高密度电法探测岩溶管道的影响。研究结果表明:高密度联合剖面法及高密度α2装置受谷地地形影响较大,容易在谷地中间产生虚假的低阻异常,矩形AMN和滚动MNB装置受地形影响较小;受谷地地形影响,高密度电法能勘探的有效异常体深度减小;同一电极距下,平地模型及谷地模型反演异常体顶部埋深均小于真实异常,横向宽度均大于真实异常,平地模型反演异常体的顶部埋深大于谷地模型反演异常体,横向宽度小于谷地模型反演异常体。
[Abstract]:The high density resistivity method has a good effect on water prospecting in karst area, but the topography of karst area is complex, and the high density electrical method is greatly affected by topographic fluctuation, in order to improve the exploration effect of high density electrical method in karst area. In order to understand the influence of topographic undulation on high density electrical method, this paper adopts the micro measuring system of high density resistivity method and simulates underground karst pipeline with copper column. The effects of topographic fluctuation on the detection of karst pipelines by high-density electrical method are studied. The results show that the high-density combined profile method and the high-density 伪 _ 2 device are greatly affected by the topography of the valley, and are prone to produce false low-resistivity anomalies in the middle of the valley. The rectangular AMN and rolling MNB are less affected by topography, and the depth of effective anomaly can be reduced by high-density electrical method under the influence of valley topography. At the same electrode distance, the depth of buried at the top of the anomaly is smaller than that of the real anomaly in the inversion of the anomaly by the flat ground model and the valley model. The horizontal width is larger than the true anomaly, and the top depth of the inversion anomaly is greater than that of the valley model, and the transverse width is smaller than that of the valley model.
【作者单位】：中国地质科学院岩溶地质研究所/国土资源部广西壮族自治区岩溶动力学重点实验室;
【基金】：中国地质科学院岩溶地质研究所所控项目(121237128100244);中国地质科学院院控基金项目(YYWF201643)资助中国地质调查局地质调查项目(DD20160300)
【分类号】：P631.3;P641.7

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