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- W583148932 abstract "Two methods to detect scour around bridge piers that are based on principles of seismology are described. The first method, the parallel seismic survey, requires that a string of hydrophones be placed in a water-filled casing external to the pier being monitored. A seismic event is produced by a hammer blow to the top of the pier. Clear indications of scour were observed in a controlled field experiment. When a multi-component foundation, such as a group of piles, is to be monitored, a reverse parallel seismic survey is suggested in which the seismic events are produced at various depths in the water and the signals recorded at the tops of the piles. While these methods can be applied after a flood has subsided, they are probably not robust enough to withstand the action of a major flood. Therefore, a second method is described in which the sensing elements (hydrophones) are placed in a tube within the foundation to protect them during a flood. With this method the seismic source is an air gun that is placed in the water near the pier being monitored and which can be activated during a flood. The results from this test, the pier-interior scour detection system survey, are not as clear as those from the parallel seismic survey; nonetheless, field experiments indicate that a scour zone can be detected." @default.
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- W583148932 date "2002-01-01" @default.
- W583148932 modified "2023-09-26" @default.
- W583148932 title "SEISMIC METHODS TO IDENTIFY SCOUR DEPTH AROUND DEEP BRIDGE FOUNDATIONS" @default.
- W583148932 hasPublicationYear "2002" @default.
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