Abstract
The defect investigation of sluice floor is an important measure to ensure the safe operation of the sluice. due to the traditional drilling methods will cause damage to the sluice floor, and the appearance inspection and compressive strength test can not evaluate the internal defects of reinforced concrete in the sluice floor. In this paper, we apply the ground penetrating radar(GPR) to the concrete quality inspection of a sluice gate in a seawall. And we describe the layout, detection principle and data processing flow of GPR. Then we simulate the propagation characteristics of radar electromagnetic wave in the presence of twodimensional electrical anomaly bodies by finite difference method. Through analyzing the amplitude, frequency and event characteristics of reflection wave shown in the gray map of GPR profiles, we determine the dividing line between concrete and muddy silty clay, finding out the density of steel in concrete, framing the location of construction joints and suspected water-filled gaps.
Highlights
A project is located in Jiaxing City Zhejiang Province
As one of the control systems of the project, the concrete quality of the bottom slab of the sluice chamber and adjacent apron and stilling basin has an important impact on the safe operation and drainage effect of the sluice
The internal structure of concrete in the bottom slab of a sluice and its adjacent apron and stilling basin is detected by Ground penetrating radar (GPR)
Summary
A project is located in Jiaxing City Zhejiang Province It is one of the key projects for comprehensive management of Taihu Lake Basin, which focuses on flood control and waterlogging removal, and takes into account irrigation and water supply, shipping and water environment improvement. Ground penetrating radar (GPR) is a geophysical method that uses high-frequency wireless electromagnetic wave to determine the distribution law of materials inside the medium. It has the characteristics of high resolution, high efficiency and no damage to the medium which widely used in the fields of engineering [1], environment[2], geological survey[3] and archaeology[4]. Through the analysis of radar wave amplitude and frequency, the division between concrete and underlying muddy silty clay layer is drawn boundary line
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