吹填土堤防的稳定及渗流分析

Stability and seepage analysis of dredge filled embankment

天津市海河干流治理工程为天津市的重点防洪工程 ,其堤防工程的郊区部分大多为复土堤型式 ,土方量很大但筑堤土源比较紧张 ,针对这一问题提出利用河道中滩地淤积土进行吹填的方案以解决土源问题 .本文针对这一重点防洪工程的设计方案 ,对堤防地基的整体稳定性进行了分析 ;采用弹塑性有限元方法计算了各设计断面的沉降和应力 ;进行了大型室内渗透试验 ,以确定堤防的渗流稳定性 .研究结果表明 ,这一方案是可行的 ,并已得到实施 .

On the basis of stability analysis, it was proved that with the self weight consolidation and moisture vaporization the hydraulic filled deposit could be used as the foundation of embankment. By performing the finite element analysis, it was found that after the completion of embankment the stress level inside the foundation was not higher than the yield stress and the uneven settlement did not exceed the allowable value. Permeability tests were carried out for the hydraulic filled soil and the failure hydraulic gradients were measured. By comparing the measured failure hydraulic gradients with those from calculation, the safety of the embankment during flooding period was evaluated