Abstract
The construction of an industrial park is now being prepared near the town of Nitra. The investor fixed very strict conditions for the bearing capacity and, above all, the settlement of halls and their floors. The geological conditions at the construction site are difficult: there are soft clay soils with high compressibility and low bearing capacity. A detailed analysis of soil improvement was made. Stone columns were prepared to be fitted into an approximately 5 m thick layer of soft clay. The paper shows the main steps used in the design of the stone columns.
Highlights
IntroductionDifficult geological conditions, created by a layer of soft to firm Quaternary clays approximately 5 m in thickness resulted in unfavourable soil characteristics: low bearing capacity and high settlement
The construction of an industrial park was prepared near the town of Nitra in 2015
Difficult geological conditions, created by a layer of soft to firm Quaternary clays approximately 5 m in thickness resulted in unfavourable soil characteristics: low bearing capacity and high settlement
Summary
Difficult geological conditions, created by a layer of soft to firm Quaternary clays approximately 5 m in thickness resulted in unfavourable soil characteristics: low bearing capacity and high settlement. In test field No 1, stone columns with a diameter of 500 to 600 mm were prepared using the technology of deep vibrating compaction, and filled with gravel of grain size 4/15 mm, 8/32 mm and 4/32 mm. In test field No 2, dynamic compaction combined with stone columns preparation using a nontraditional technology was used for soil improvement. In field test No 3, dynamic consolidation with a weight of 20 t falling in free fall from a height of 10 m was performed Using this technology created craters approximately 2 m in diameter. The paper focuses on the design of soil improvement for uniform floor load intensity of 60 kPa
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