碎石桩复合地基固结简化分析

碎石桩复合地基在工程上的应用非常广泛,其应力应变性状的研究已很深入,固结问题也得到了不同程度的研究,但是已有的解析式大多较复杂,工程中难以应用。本文将桩间土径向整体作为一个研究对象,从而避开单独考虑因施工造成的涂抹作用的影响;根据排水量与体变等效原理,用平均超孔隙水压力的概念推导出一种简化的固结计算式。该方法可直接得到不同深度碎石桩和桩间土的平均超孔隙水压力和平均固结度,也可计算复合地基整体固结度。本文推得的解析式简洁且实用性强。

Simplified analysis for consolidation of gravel-pile composite foundation

Gravel-pile composite foundation has been widely applied to the practical engineering projects, and the characteristics of its stress and strain have been studied deeply. The consolidation of the reinforced foundation has been researched to a certain extent, but the known analytic formulas are mostly complicated, so that they are difficult to be used in practical application. Radial soil around piles is considered as a whole element in this paper, the effect of the coating caused by construction is not necessary to be considered. According to the theory of equivalent of seepage discharge to volume change, a simplified formula for consolidation is derived from the concept of average excess pore water pressure. This method can solve the average excess pore water pressure and average degree of consolidation of the gravel piles and its surrounding soil, and the average degree of consolidation of the entire reinforced foundation can be also obtained. This formula is laconic and has the advantage of being easy to find application.