粘性土-砂井地基单井固结模型的改进

单井固结模型的计算中通常将砂井周围土体简单划分为涂抹区和非涂抹区,不符合实际砂井周围土体的渗透系数分布复杂的事实。本文在Terzaghi固结理论的基础上提出了改进的单井固结模型,以一个待定参数流量系数Cq取代涂抹区和非涂抹区渗透系数来刻画砂井周围土体的横向渗透性特征,使单井固结问题得到高度简化又不失严密性。本文将改进模型用于非完整砂井单井固结的最终沉降量的数值计算,并将计算结果与谢康和改进法以及Hart法的解析解进行了比较,证明了改进模型数值解的可靠性。

Improved model of consolidation for single sand drain on foundations with cohesive soil layers

In the consolidation model for single sand drain, the area of soil around sand drain is always simply marked as smear zone and non-smear zone. But it is not accord with the fact character of the cohesive soil permeability around the sand drain. On the base of consolidation theory of Terzaghi, a new model of consolidation for single sand drain is brought forward. In the new model, the permeability coefficient of smear zone and non-smear zone is replaced with flux coefficient C_q . It highly predigest the calculation of consolidation for single sand drain but keep the strictness of calculation. In this paper the new model is applied to calculate the final settlement of non-fully penetrating sand drain, and the solution is compared with the solutions of Xie's improved method and Hart's method. Through the comparison, we demonstrate the reliability of the improved model.