Detection of Hidden Dangers of Canal and Dam Based on Multi-electrode Resistivity Method and Geological Radar
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摘要:
为查明引额济克调水工程阜康段引水干渠的介质结构和病险隐患，采用高密度电法和地质雷达进行综合勘察，识别出4处不稳定沉降区域的位置、形态及范围，经地表开挖工程验证了探测效果的可靠性。工程实例应用表明，高密度电法能直观地反映地电断面分布特征，电阻率的突变易于识别渗漏隐患；地质雷达成像在波阻抗层面及不均匀介质识别中准确直观，可以对高密度电法进行有效补充。两种方法的结合，利用多参数提高异常识别的准确度，降低物探异常的多解性，再结合少量工程验证，能够在水渠、水库、防洪堤等坝基渗漏隐患探测中发挥重要作用。
Abstract:In order to find out the medium structure and hidden danger of the main diversion channel in Fukang section of Yin-Er-Ji-Ke Water transfer Project, the multi-electrode resistivity method and geological radar were used to conduct comprehensive investigation, and the location, shape and scope of four unstable settlement areas were identified. The reliability of the detection effect was verified by surface excavation project. Engineering examples show that the multi-electrode resistivity method can directly reflect the distribution characteristics of geoelectric section, and the sudden change of resistivity is easy to identify leakage hazards. Geological radar imaging is accurate and intuitive in wave impedance level and identification of heterogeneous media, which can effectively supplement the multi-electrode resistivity method. The combination of the two methods, using multiple parameters to improve the accuracy of anomaly identification, reduce the multi-solution of geophysical anomalies, combined with a small amount of engineering verification, can play an important role in the detection of hidden seepage of dam foundation such as channels, reservoirs, flood prevention levees and so on.
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表 1 研究区物性参数表
Table 1. Physical property parameters of the study area
介质 介电常数 电阻率（Ω·m） 备注 空气 1 ∞ 收集 河水 80 0.1～20 实测 砂土 5～35 15～50 实测 黏土 8～45 10～30 实测 混凝土 4.5 150～500 实测 砂质粉土 3～6 30～100 实测 
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