KEY ACHEIVEMENTS

•Keller successfully executed ground improvement works for first Airport parking project.
•Dry vibro stone column addressed the bearing capacity problem of low permeable soft clayey soil.
•Efficient methodology was adopted to provide solution for critical project of constructing aircraft parking bays which are subjected to varying load conditions.

The Project

Cochin International Airport Ltd. (CIAL) proposed to expand aprons adjacent to existing apron area and associated airfield systems. Keller was commissioned by the main contractor for the execution of ground improvement works using vibro stone columns  for the proposed construction of aircraft parking bays.

The Challenge

The apron area of approximately 41,000 m2 was proposed to develop on loose filled up soil deposit. The site has challenging geology that comprised of highly compressible plastic clay. Also, the presence of buried nallah as on a part of apron foundation may cause differential settlement when rigid foundation are placed. Working inside an operating airport needed a careful planning for rig movements.

The Solution

Considering the geotechnical challenge, the optimized foundation solution using vibro stone column were proposed to address total & differential settlement that not only helped in saving client’s cost but also considerable amount of time. The treatment area was extended beyond the foot print area of the apron in order to provide the confinement effect for the outer rows and to facilitate a smooth transition between treated and untreated soils. This solution had effectively tackled the bearing capacity, settlement problems and additionally it also provided effective drainage paths to ensure rapid consolidation. Four (4) no’s of rigs were used to deliver the project on time.