Abstract
This paper developed a piezoelectric-transducer-based damage detection of concrete materials after blasting. Two specimens (with or without an energy-relieving structure) were subjected to a 40 m deep-underwater blasting load in an underwater-explosion vessel, and their damage was detected by a multifunctional piezoelectric-signal-monitoring and -analysis system before and after the explosion. Statistical-data analysis of the piezoelectric signals revealed four zones: crushing, fracture, damage, and safe zones. The signal energy was analyzed and calculated by wavelet-packet analysis, and the blasting-damage index was obtained after the concrete specimen was subjected to the impact load of the underwater explosion. The damage of the two specimens gradually decreased from the blast hole to the bottom of the specimen. The damage index of the specimen with the energy-relieving structure differed for the fracture area and the damage area, and the damage protection of the energy-relieving structure was prominent at the bottom of the specimen. The piezoelectric-transducer-based damage monitoring of concrete materials is sensitive to underwater blasting, and with wavelet-packet-energy analysis, it can be used for postblasting damage detection and the evaluation of concrete materials.
Highlights
With aid of a water-medium explosion vessel, two specimens with and without an energy-relieving structure were exploded with the same charge under a simulated water depth
Active-sensing technology based on a piezoelectric transducer was used to detect the structural health of the before and after blasting
With the aid specimens of a water-medium explosion vessel, two withand anddamage withoutindex an energyof the relieving two specimens were obtained by statistical comparative analysis of the wave-peak value structure were exploded with the same charge under a simulated water depthand of 40 m
Summary
Blasting is currently the most commonly used construction method for large foundation excavation and forming. A large amount of energy released after the explosion fragments the rock mass in the excavation area, and causes irreversible dynamic disturbances to the retained rock mass in the damaged excavation area [2,3]. The integrity and physical mechanics of the rock mass in the damaged excavation zone deteriorate at various degrees [4], and have direct impact on the quality of the foundation construction, the economic benefits of the project, and the overall construction progress. Controlling excavation damage and reducing blasting influence on the rock-foundation protection layer is a focus of engineering-practice and rock-dynamics research [5]
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