改进Asaoka法反演固结系数方法的研究

Study on improving inverse calculation of consolidation coefficient with Asaoka method

针对地基处理中塑料排水板堆载预压情况,结合竖井固结理论,对Asaoka法中斜率与固结系数的关系式进行修正,得到了同时考虑竖向和水平向固结的反演公式。采用大型堆载预压工程实测沉降数据,对改进的Asaoka法中的固结系数进行反演计算,结果表明:考虑水平向固结系数的影响以及井阻和涂抹效应情况时,改进方法的固结系数比Asaoka法固结系数小,沉降计算值与实测值较接近,误差在5%以内。

According to the preloading situation of the plastic drain board during ground treatment,the theory of vertical drain consolidation was combined to correct the relation between the slope and consolidation coefficient in Asaoka method.Then,the inversion formula which takes into account of both vertical and horizontal consolidation at the same time was gained.Large stack preloading engineering was applied to measure the settlement data and inversion calculation was carried out for the consolidation coefficient in Asaoka method.The results indicate that the consolidation coefficient of improved method is smaller than that of Asaoka method when the influence of horizontal consolidationcoefficient,well resistance and smear efficiency is considered.The settlement calculation value is close to the measured value,and the error is within 5%.