Abstract:

This article is about the solution of geotechnical problems by using piled foundation and jet grouting technique prior to the construction of an industrial building in Sakarya, Turkey. A one-story factory building was planned to be built and the area covers approximately 8200 m2. After the evaluation of borings (total depth of 220 m) and 5 soundings, it was understood that top layers of the study area consist of soft high plasticity clays while liquefiable sandy and silty soils, up to 8-0 m, were encountered. Medium or dense sand layers were encountered between the depth of 7.50 m and 2.0 m. Ground water level is at a depth between .70 m to 2.00 m below the surface. Soil investigations show that soil improvement was necessary up to m to prevent settlement problems induced by liquefaction. Another option is to use piles under strip foundations. Piles having radius of 60 cm and length of 0 m were calculated to be enough to decrease post-earthquake settlements to acceptable limits. In addition to this problem, because a morphological disorder was observed in the near vicinity of the area just after the 999 earthquakes, the place of the intended building becomes very important. An exploratory trench, which has a length of 24 m, depth of 2 m and width of .50 m, was oriented perpendicular to the disorder to identify the properties of the geomorphological disorder. The difference along the trench was determined and the building was decided to be built far enough to the disorder. After detailed investigation of soils by borings and soundings and observation of the geomorphological disorder, the building was thought to be built safely by determining the foundation place far enough from the disorder and on treated ground improved with high modulus columns. 

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