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Berth Deepening by Rock Blasting at the Howland Hook Marine Terminal, Staten Island, NY
Instrumentation of a marine terminal during close-in underwater blasting included in-rock and wharf-mounted geophones and water pressure sensors adjacent to piles. Limits placed on vibrations and pile cap shear strains were 25 in/s (635 mm/s) and 467 μ-strains (safety factor of 4). Pile cap and wharf deck strains were calculated from time-correlated displacement measurements during 42 blasts up to 9 ft (2.7 m) from the wharf. The highest ground velocity and acceleration adjacent to piles were 46 in/s (1,068 mm/s) and 95 g’s while the highest pile cap strain was 435 μ-strains. Peak frequencies averaged 200 Hz (0.005 s period). Peak concrete deck bending and tensile strains were 15.5 and 9.7 μ-strains, respectively. The wharf sustained no damage at these strains. Structure response spectra were computed for the largest expected earthquake and compared with a typical blast demonstrating that structure displacements and strains at the wharf natural period are lower for blasting.
Berth Deepening by Rock Blasting at the Howland Hook Marine Terminal, Staten Island, NY
Instrumentation of a marine terminal during close-in underwater blasting included in-rock and wharf-mounted geophones and water pressure sensors adjacent to piles. Limits placed on vibrations and pile cap shear strains were 25 in/s (635 mm/s) and 467 μ-strains (safety factor of 4). Pile cap and wharf deck strains were calculated from time-correlated displacement measurements during 42 blasts up to 9 ft (2.7 m) from the wharf. The highest ground velocity and acceleration adjacent to piles were 46 in/s (1,068 mm/s) and 95 g’s while the highest pile cap strain was 435 μ-strains. Peak frequencies averaged 200 Hz (0.005 s period). Peak concrete deck bending and tensile strains were 15.5 and 9.7 μ-strains, respectively. The wharf sustained no damage at these strains. Structure response spectra were computed for the largest expected earthquake and compared with a typical blast demonstrating that structure displacements and strains at the wharf natural period are lower for blasting.
Berth Deepening by Rock Blasting at the Howland Hook Marine Terminal, Staten Island, NY
Aimone-Martin, Catherine T. (author) / Meins, Brent M. (author)
14th Triennial International Conference ; 2016 ; New Orleans, LA
Ports 2016 ; 233-242
2016-06-06
Conference paper
Electronic Resource
English
The Howland Hook Marine Terminal Port Redevelopment on Staten Island, NYC
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