2m silty clay is below the ground 3m averagely. replacement may not be a good approach. -Jo8jE~>V
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if time is not very urgent, sandy drains may be used to accelerate the consolidation and increase the strength. 0nkon3H
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stone column also is an alternative for it can incease the bearing capacity promptly. it can be used if the project is urgent. /PP\L](
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as has been mentioned, heavy tamping has been used on your site. for the convenience, dynamic replacement may be a better choice for this project, considering the time, economy, efficiency. tamping the sand and stone into the silty clay layer, thus the stone column will be formed. meanwhile, the tamping will increase the neighbour soil.