Concrete faced rockfill dam face plate disengaging and positioning detection method based on vibration sensing technology

Abstract

The invention relates to a concrete faced rockfill dam face plate disengaging and positioning detection method based on a vibration sensing technology. The method comprises the steps of: firstly determining whether the lower part of a face plate is disengaged or not; determining a lower void position of the face plate; and when the face plate has a void part, determining the void position by comparing the difference of the vibration signals of the measuring points in each detection area, and finally, visually displaying a detection result in an image mode. The device has the characteristics ofthe light weight, the convenience in installation, the easiness in operation and capability of achieving disengagement positioning of the face plate.

Description

technical field [0001] The invention relates to a face dam face voiding and positioning detection method based on vibration sensing technology, and belongs to the technical field of face dam safety detection. Background technique [0002] With the continuous construction and operation of concrete face dams, some problems have also appeared in some dams, which have affected the operation safety of the dams. For example, the Northwest Port face rockfill dam in China is still deforming after seven years of use; the Seshana Dam in Australia is still deforming after ten years of use. 118mm after the time, until 140mm nine years later; structural cracks appeared in the first-class Tianshengqiao dam and some face dams abroad, and the separation of the face plate and the cushion may affect the force condition of the face plate, resulting in cracking of the face plate , which could lead to leaks in the dam. [0003] Due to the different material properties of the rockfill body, the...

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Problems solved by technology

[0004] Aiming at the problem of void under the concrete slab, engineers and technicians have studied geological radar, thermal infrared detection, hammer vibration method, seismic wave method, acoustic wave method and impact echo method, etc. When these technologies are applied to relatively flat concrete slabs The effect of void detection is better. However, considering that the panels of the concrete face dam of the reservoir have a large inclination angle, large length, width and thickness, on the one hand, the inspectors cannot stand on the panels, so they can only use the method of hanging For detection, when using geological radar, shock echo method and other detection methods, the operation is more difficult, and the equipment cannot fit well with the concrete panel surface, resulting in a large dispersion of measured data; on the other hand, due to the panel Compared with the concrete pavement, the face of the dam has a different aspect ratio and overall rigidity. When the vibration method is used to test, the size of the excitation force and the selection of the excitation method are also quite different.

In addition, in addition to determining whether there is a void in the lower part of the concrete panel, how to locate the void is also a technical problem that has not been solved by the existing vibration detection methods

[0005] At present, although scholars at home and abroad have done a lot of research on simulation analysis and detection methods for concrete face rockfill dams, these methods have certain limitations. Safe operation requires more accurate and convenient detection methods

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