Non-contact underwater detection method of river channel underwater foundation stone

Abstract

The invention relates to a non-contact underwater detection method of a river channel underwater foundation stone. The underwater detection method can effectively, quickly, accurately and safely detect the underwater foundation stone. The method comprises the following steps: firstly performing ground survey and fracture surface location, including setting up a base station and measuring fracture surface control points; according to the river channel environment conditions, determining a detecting manner, including a foundation stone surrounding fracture detecting manner or a dam surrounding detecting manner; mounting a detecting instrument: including connecting a detector with a GPS (Global Positioning System) and connecting a navigator with the GPS; adopting the GPS navigation function to guide underwater foundation stone detection; processing and analyzing data information: including calculating stone lost area and stone lost amount; outputting the result, including outputting a foundation stone detection result map and a detection result table. The non-contact underwater detection method is easy to operate, quick, accurate, safe and effective to detect the underwater foundation stone, high in the working efficiency, low in the labor intensity, and capable of effectively solving the technical problem of river channel foundation stone detection.

Description

technical field [0001] The invention relates to detection technology, in particular to a non-contact underwater detection method for underwater roots and rocks in river channels, which is mainly used for underwater foundation detection work in flood control projects and port projects, and can also be used for underwater geological surveys. Background technique [0002] The river regulation project, especially the important part of the flood control project of the Yellow River, including the dangerous engineering and control engineering, is composed of three types of buildings: dams, stacks, and bank revetments. The safety of the project depends on the stability of the root rock foundation of the dam bank. Important technical foundation work for safety and flood control safety. [0003] The root rock detection of the Yellow River channel regulation project has been using the traditional manual cone detection method, a contact detection method. Along the detection section, th...

AI Technical Summary

Problems solved by technology

[0008] The current of the Yellow River has a high sediment content, and the signal needs to pass through muddy water, silt or soil layers to reach the root-rock interface. The energy attenuation is fast, and it is difficult to extract effective signals. The electrical methods, electromagnetic methods, geological radar, and seismic methods used before have not can test successfully

Commonly used underwater detection equipment, such as SP-Ⅲ shallow profiler, etc., do not have the ability to penetrate muddy water and mud layer detection

[0009] (2) The root stone detection range is generally only within the range of 30 to 40 meters outside the dam head, and the working site is narrow, making detection difficult

Conventional geophysical methods cannot arrange a reasonable observation system

[0010] (3) The flow state in front of the dam is turbulent, the flow velocity changes greatly, the working conditions are complicated, the signal-to-noise ratio is poor, and the operation is difficult

[0011] (4) The roots and rocks are scattered, the surface is irregular, the slope is steep, and the interface signal is difficult to identify

However, none of them can solve the technical problems of root stone detection