The clogging effect caused by installing stone columns is depth-dependent.The movement of soil particles into the stone column caused by consolidation further contributes to the clogging effect of the column,which leads to the column permeability decaying temporally.Considering the temporal and spatial variation of the well resistance of stone columns as well as the nonlinear compressibility and the permeability of soils around the stone column,a nonlinear consolidation model of stone column composite foundation under multi-stage loading is established.The solution of the model is solved by the finite difference method,whose reliability is verified by comparing with the existing solutions under specific conditions.Extensive computations are analyzed to investigate the effect of variable well resistance parameters on the consolidation of stone column composite foundation.The results indicate that:the consolidation rate of the stone column composite foundation decreases as the temporally or spatially dependent well resistance parameter increases.Moreover,the consolidation rate accelerates as the final drainage capacity of the stone column increases.Among these factors,the effect of the temporal parameter on the consolidation rate of the composite foundation is more significant.Finally,the consolidation model of the stone column composite foundation considering variable well resistance is applied to the settlement calculation for an actual project in Malaysia.Compared to the existing solution,the theoretical result of the proposed model shows a better agreement with field measurement,indicating that the proposed consolidation model possesses a certain engineering practicability.
关键词
基础工程/碎石桩/变井阻/非线性/多级加载/竖向渗流
Key words
foundation engineering/stone column/variable well resistance/nonlinearity/multi-stage loading/vertical flow
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