AKSA WASTE WATER TREATMENT FACILITY PROJECT
Stiff Impact® elements were chosen under the structures which are critical in terms of differential settlements at the project site located at southern shores of the Marmara Sea and represented with alluvial deposits. The Impact® system with a diameter of 0.5m was applied mainly for liquefaction mitigation purposes, it was also considered for reduction of static-seismic and differential settlements of the project.
The project consists of 9 new structures such as aeration and balancing tanks, clarifiers and technical units. The design load considered for these structures were between 80 kPa and 110 kPa. For earthquake liquefaction calculation, the values of PGA and its magnitude were: 0.4g and 7.5.
The soil profile consists of mainly 1m of topsoil over 2m to 3m of firm to stiff clay over 6m to 8m of loose to medium dense silty sand underlain by soft to medium stiff silty clay. Groundwater was encountered 0.15-0.7m below EGL during the geotechnical exploration.
To increase the factor of safety against liquefaction to 1.1-1.2 and to minimize the differential settlements, Impact® elements installed 1.6m and 1.7m square pattern on center and extended to depth of 15m beneath aeration tank and the other structures, respectively. The Geopier Impact® ground improvement solution for this project consists of 92,577 meters of Rammed Aggregate Pier® (RAP) elements.
YALOVA – CIFTLIKKOY
OWNER: AKKON YAPI
RAP DESIGNER AND INSTALLER: SENTEZ INSAAT
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