Abstract
Solidifying dredged mud into a fill material is a waste-recycling strategy. Recent studies have demonstrated that using solidified mud to create columns for ground treatment mitigates the limitations in the supply of traditional gravel/sand columns. This research conducted a series of uniaxial compression tests to investigate the effects of curing stress and length-to-diameter ratio on the strength and deformation characteristics of solidified dredged mud columns. It was found that an increase in the length-to-diameter ratio led to a reduction in the failure strain of the columns and a decrease in uniaxial compressive strength. The curing stress boosted the columns’ uniaxial compressive strength by 8%-14%, elevated the modulus, and heightened brittleness while lowering the failure strain. A predictive formula was developed to accurately estimate the uniaxial compressive strength of cement-solidified columns under various length-to-diameter ratios and curing stresses. Furthermore, with or without curing stress, the failure mode of the columns transitioned from overall failure to local failure as the length-to-diameter ratio increased, with the local failure predominantly occurring near the column top. The application of curing stress increased the brittleness of the columns, making them more prone to developing vertical cracks in the column shaft.
Published Version
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