Deep soil mixing design under seismic conditions-a case study

Deep soil mixing columns were designed and applied under the structures of Turkmenbashi International Seaport Project locatedon the Caspian Sea coast of Turkmenistan. Shallow sea bed was filled and port was planned to be constructed on both mainland and reclaimed area. Soil profile consists of mainly clay which has a stiffness increasing with depth. A very soft clay layer exists with a depth varying between 6 and 10 m from the seabed level. Due to the compressible layers and high seismicity of the region deep soil mixing columns were designed to increase the stiffness of the soil under the structures. Settlements under the foundations are calculatedwith finite-element method considering the improved soil parameters. Within this case-study design processand application phase of the deep soil mixing works are summarized.