基于示踪试验的水库坝体渗漏通道参数估算

Estimation of Leakage Passage Parameters of Reservoir Dam Based on Tracer Test

坝体渗漏是水库常见的问题之一,影响水库的防洪、灌溉、发电效益以及坝体的安全性。该文通过对某水库大坝的示踪试验,确定了该大坝3^(#)坝段库前面板与廊道U3边缝之间存在渗漏通道。采用回收质量法和配线法分别计算了相关参数。运用回收质量法计算渗漏通道相关参数,其结果显示:示踪剂穿透曲线为陡升陡降的单峰,下降时有微小峰值,证明渗漏通道存在微小支流,且通道中无较大空洞;渗漏通道水流为层流状态,差异溶蚀明显。采用配线法计算得到的通道弥散系数与回收质量法的计算结果基本为同一数量级,但回收质量法的计算结果偏大,主要是因为穿透曲线存在一定拖尾现象,这与实际情况基本吻合。配线法更适用于正态分布类型的穿透曲线试验,而回收质量法能够简单快速地计算多种参数,适应性广。

The dam leakage is one of the common problems of reservoir, which affects the flood control, irrigation, power generation benefit of the reservoir and affects the safety of the dam. In this paper, through the tracer test of a reservoir dam, there is a leakage passage between the front face of the No.3 dam section and the U3 joint of the corridor of this dam is determined. The relevant parameters are calculated by the recovery mass method and fitting curve method. Using the recovery mass method to calculate the relevant parameters, the results show that the breakthrough curve of tracer is a single peak with steep rise and drop, and there is a small peak when the curve dropped, which proves that there are tiny tributaries in the leakage passage, and there is no large hole in the passage;The water flow in the leakage passage is laminar flow and the difference of corrosion is obvious. The channel dispersion coefficient calculated by the fitting curve method is basically the same order of magnitude as the calculation result of the recovery mass method, but the calculation result of the recovery mass method is larger, which is mainly due to the trailing phenomenon of the penetration curve, which is basically consistent with the actual situation. The fitting curve method is more suitable for the penetration curve test of normal distribution type, while the recovery mass method can calculate many parameters simply and quickly, and it has wide adaptability.