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For the existence of the potential safety risk, it is necessary to reveal the distribution of these hidden defects in the seawall body. Based on the analysis of seawall engineering and foundation characteristics, ground penetrating radar (GPR) has been used to identify the hidden defects and quality status of loosening weak layers in the seawall body (clay). The detection results are in good agreement...
In terms of seeking the characteristics of wave propagation many engineering infrastructures can be regarded as a waveguide due to their distinguished physical properties in contrast with the natural surroundings. Coastal protection dykes can be treated as such a waveguide. Taking this as the conceptual model we try to seek the signature of the voids or defect weak spots inside the dyke or in the...
Seawall is an important public facility which can protect areas of human habitation from the destructive aspects of tides or waves. Maintenance and monitoring of seawall structures plays an essential role in public safety and prevention of flooding of areas behind the seawall. The presence of hollow area beneath the concrete slab of riverside slope can result in the settlement and distortion of face...
The loss of the higher frequency components of electromagnetic wave due to soil absorption and attenuation results in GPR signal decrease rapidly in deep areas. High frequency compensation is one of most important ways to improve GPR data resolution. The S-Transform (or ST) has been widely used in digital signal processing since it was proposed. Here, improved S-transform to GPR data has been designed...
Successful GPR cases related to defects detection to concrete liners of tunnels can be found in the last ten years. Generally, it was very difficult to get high quality data due to the limited data acquisition condition in tunnel, which might decrease the reliability of interpretation results. It is a great challenge to highlight the deep reflection events from the background with strong noise. Attribute...
This study focuses on the use of ground penetrating radar (GPR) to delineate riprap layers in cross sections of tidal flat embankments. Foundation treatments are an important consideration in the reclamation of tidal flats and for offshore engineering in coastal areas with soft soils. Such treatments generally consist of explosive riprap fill. The bottom depth and cross-sectional shape of the riprap,...
The potential failure zone in a seawall is a hidden danger that requires exact and immediate detection. Of all the different geophysical exploration methods, ground penetrating radar (GPR) has proven to be the most effective, non-destructive, highly efficiency detection method. It has been successfully used to investigate the structure and condition of many seawalls in Eastern China. In this study,...
For using GPR as a non-destructive testing to the hidden weak points in dam or seawall, how to reasonably analysis the GPR image and obtain the exact interpretations is still an unsolved problem. Combined with the dam engineering features and detection experiences, geophysical models of typical hidden weak points, such as horizontal non-homogeneous layer, slope non-homogeneous zones bearing coarse-grained...
In this study, Ground penetrating radar is used to detect the quality of back-filled grouting in a shield tunnel. A simulated GPR record shows that the steel bars in lining segments usually generate strong scattering and multiples, thereby obscuring the reflections from objects and making it difficult to locate the objects. Various filtering methods for multiple suppression (i.e., predictive deconvolution,...
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