微动技术在堤坝渗漏探测中的应用

Application of microtremor exploration in dam leakage detection

堤坝是重要的水利工程,其安全性至关重要。坝体渗漏是常见的安全隐患之一,对坝体渗漏位置、程度以及坝体结构变化的探测一直是重要的物探课题。微动勘探作为一种新兴的物探手段,应用范围正逐步拓展,通过某水库大坝渗漏检测实例,展示频率-波数法微动线性点阵剖面测量进行大坝渗漏检测的效果,该技术通过提取频散曲线及视S波速度成像,刻画地层速度结构并圈定异常,可实现对大坝渗漏快速精确的无损探测,具有一定的方法优势和广泛的应用前景。

Dams are important water conservancy projects and their safety is of paramount importance. As leakage is one of the most common safety hazards for dams, the detection of the location and extent of dam leakage and the structural changes of the dam has always been an important topic for geophysical exploration. As a new geophysical exploration method, microtremor exploration is expanding its application gradually. This paper introduces the linear microtremor observation array and the high-resolution frequency-wave number spectrum analysis of microtremor with an actual example of dam leakage detection, which proves that it is reliable to do dam leakage detection effectively and non-destructively through extracting the surface wave dispersion curve, inverting the S-wave velocity structure of the subsurface medium, characterizing the formation velocity structure and delineating the anomaly. This technique can realize its application prospects with its advantages.