A 6 m high reinforced embankment was supported by Deep Cement Jet Mixed Piles on Soft Bangkok clay. Each clay-cement pile (or soil-cement column) had diameter of 0.50 m and length of 9.0 m and were installed at 1.5 m center to center spacing in square pattern. The performance of the full scale test embankment was observed for a period of one year until 90% consolidation was achieved. Subsequently, analytical analyses were performed and the results were compared with the measured data. Consequently, the relevant geotechnical parameters were back-calculated including the permeability ratio, compressibility ratio, and the coefficients of consolidation of the pile and surrounding clay. Since the actual load transfer mechanism is neither equal strain nor equal stress, weighting factors were utilized to obtain the average degree of consolidation. The results demonstrated that at any time, the overall load transfer mechanism can be taken as 80% equal strain condition plus 20% equal stress condition. Furthermore, the deep mixing piles has resulted in 70% settlement reduction in the improved foundation.
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