Method for detecting dam leakage through combination of tracer method and dilution concentration method

Abstract

The invention discloses a method for detecting dam leakage through combination of a tracing method and a dilution concentration method. The method comprises the following steps of: firstly, determining the layout positions of drill holes according to a field investigation condition, analyzing and determining the connectivity between each drill hole and a reservoir water level through water level change correlation, and preliminarily determining a permeation channel between the drill holes through a tracing test; and further measuring the flow rates corresponding to different elevation points in each drill hole by adopting a single-hole dilution underground water flow rate method, drawing a flow rate-elevation curve, finally selecting two drill holes with permeation channels determined by a tracing test, comparing the flow rate-elevation curves of the two drill holes, and finally obtaining the specific leakage part of the dam and the leakage strength of the dam. The tracing method and the single-hole dilution underground water flow velocity method are combined, the same tracing agent is used for testing, the number of drilled holes and the testing cost are greatly reduced, and meanwhile the seepage detection efficiency and precision are improved.

Description

technical field [0001] The invention relates to the field of geophysical detection of water conservancy projects, in particular to a dam seepage detection method realized by a tracer technology and a single-hole dilution concentration velocity measurement technology. Background technique [0002] In the 1950s, foreign scholar Moser proposed the method of measuring groundwater velocity by radioactive isotope single-hole dilution tracer. Through the efforts of Drost et al., a relatively systematic theoretical basis was initially established and put into engineering practice. my country introduced this method in the 1980s, and it has been widely used in water conservancy, mining, groundwater exploration and other fields. [0003] For the detection of dam leakage, the tracer test is one of the commonly used detection methods, that is, the appropriate tracer is put into the upstream of the seepage section of the aquifer, and the tracer composition is continuously measured by usin...

AI Technical Summary

Problems solved by technology

[0005] The main advantages of the tracer method for leak detection are simple implementation and strong practicability. It can be applied to detection with a large research scope to determine the direction of seepage. However, this method can only initially locate the leak channel, and it is difficult to further determine the specific location of the leak.

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