Abstract
Ground improvement using group floating stone compaction piles with a small replacement area ratio is an effective solution for improving soft clay for construction of buildings with up to two storeys. Sufficient data based on field studies for the improvement of the ground using stone compaction piles with a smaller diameter and low area replacement ratios are not available. This study was intended to create a database for assessing the improvement of clay ground and predicting the suitability of group floating compaction piles with granular materials for the improvement of clay ground based on the properties of clay. Twelve sites were selected for conducting the study. The effects of different soil properties such as sensitivity, liquidity index and consistency index on the improvement of the undrained shear strength of clay were investigated. Also, a correlation of standard penetration test values before and after the improvements was arrived at based on field observations. The results are discussed in this paper.
Highlights
When a very soft clay ground with low shear strength and high plasticity characteristics is encountered, even the construction of a light structure becomes a teasing problem for geotechnical engineers
Floating stone compaction piles (SCPs) with a small replacement area ratio are constructed by driving an empty steel casing pipe with a concrete plug made of M20 concrete placed at the bottom of the steel casing pipe
The SPT and static cone penetration tests (SCPTs) results after the improvement of the clay ground with SCPs at different time intervals indicate that the improvement in the shear strength of the clay after 6 months is negligible
Summary
When a very soft clay ground with low shear strength and high plasticity characteristics is encountered, even the construction of a light structure becomes a teasing problem for geotechnical engineers. Ground improvement using group floating stone compaction piles with a smaller diameter and a low replacement area ratio is effectively used for the construction of residential buildings with up to two storeys to counter the low shear strength and the high compressibility of the soil. Floating stone compaction piles (SCPs) with a small replacement area ratio are constructed by driving an empty steel casing pipe with a concrete plug made of M20 concrete placed at the bottom of the steel casing pipe. A concrete plug with a diameter of 88 mm and a conical shape for the bottom half is placed at the bottom groove of a steel casing pipe with a 100 mm external dia. During the withdrawal of the steel pipe, a stroking motion is imparted to the steel pipe to compact the broken stones inside the SCPs. Jetting of water is done through
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