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This project was for a 530 MW gas-fired combined cycle electric generation facility, which includes two combined cycle combustion turbine generators (CTG), two heat recovery steam generators (SRSG), and one steam turbine generator (STG) and an upgrade of the existing water intake structure. The site had a unique history as a reclaimed phosphate mine located in Bartow, Florida.
The subsurface exploration program comprised of soil test borings, cone penetration test (CPT) soundings, dilatometer test (DMT) soundings, field shear wave and compression wave measurements, and electrical soil resistivity measurements. Various foundation options were evaluated for different structures. The major structures for power generating equipment were supported on displacement auger-cast in-place piles and auxiliary structures were supported on shallow foundation systems. The geotechnical report presented detailed recommendations for design and quality control of displacement cast in place concrete piles.
During construction, WPC performed pile load test program and construction monitoring of displacement auger cast pile installation. One unique feature of this project was the use of Single Hole Sonic (SSL) Logging Technology in the quality control testing of auger cast piles. SSL tests pile integrity by placing an ultrasonic source and receiver in a pre-installed access tube. WPC’s timely detection of potential pile defects allowed remedial measures before foundation construction.
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