SEISMIC RESPONSE ANALYSIS OF GROUND IMPROVED BY SAND COMPACTION PILE METHOD IMMEDIATELY BENEATH STRUCTURES CONSIDERING GROUND HETEROGENEITY

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  • 地盤の不均一性を考慮した構造物直下のSCP改良地盤の地震時応答解析

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<p> It has been reported that spatial variation in the properties of the improved ground is caused by variations in the properties of the original soil and the degree of compaction of the sand piles during construction using the sand compaction pile method. Recently, the spatial heterogeneity of ground strength of ground improvement methods has been studied by Monte Carlo simulation using random field theory to understand the seismic behavior. In this paper, the seismic behavior of non-uniform SCP improved ground is evaluated using the above method. As a result, (1) the coefficient of variation of settlement after 100 MCS cycles is 0.129 for the unimproved ground and 0.018 for the improved ground, and it is confirmed that the coefficient of variation of settlement is reduced. (2) The correlation coefficients between the settlement of the unimproved soil and the liquefaction rate defined by the excess pore water pressure ratio and shear strain in the elements at the center of the improvement (x = 40-60m, y = 2.5-7.5m) were 0.743 and 0.881, respectively, suggesting that the behavior of the central elements affects the settlement behavior.</p>

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