小型水库渗漏病害并行电法测试应用

Application of Parallel Resistivity Method Exploration for the Dam Body Leakage in Small Reservoirs

近年来使用中的小型水库坝体因病害产生的事故在不断增多,所开展的库坝异常诊断需要得到加强。目前,地球物理方法已被广泛应用到水库坝体病害勘察中,但受不同方法限制,其探查的灵敏点不同。发生的病害主要是坝体渗漏引起的坝基失稳问题,电阻率法可以发挥重要的作用。文章采用并行电法采集技术,利用小极距高密度采样并综合反演,可以对大坝渗漏等异常位置较为准确探查与预报。现场实践结果表明,并行电法在大坝探查中具有一定的优势,适宜于中小型土石坝病害诊断与分析。

In recent years, the accident of small reservoirs is increasing constantly because of dam body disease. So the daily abnormality diagnosis for dam body needs to be strength- ened. At present, the geophysics methods have been used widely in the exploration of res- ervoir dam disease, but the different method has the different sensitive spot. The generated disease is the unstable problem of dam foundation caused by the leakage of dam body, so the resistivity method can play an important role. The paper adopts the parallel resistivity method and makes use of the high--density sample through the way of small polar distance so as to detect and predict the leakage location of the dam accurately. The results indicate that the parallel resistivity method has the particular superiority in detecting the geological abnormality in dam foundation, and it suits to diagnose and analyze the dam body disease of small and medium size dams.