Abstract: To study the seepage prevention of ash yard in soft soil, analyse the influence of settlement to the the seepage prevention, taking an ash yard in Southeast Asian country as the engineering example, a coupled analysis model of seepage field and stress field is formed by Geo-studio. By simulating the actual surcharge scheme of ash yard, the settlement of different area at different time are obtained. The results show that the maximum differential settlement in this project is 3.7m, the seepage prevention in this area should be focused on. Based on the seepage flow of 1.5mm high density polyethylene(HDPE), the 10m vertical cutoff wall cannot meet the requirement. Only when the flow channel has be cut, the vertical cutoff wall can meet the requirement, but it requires a higher cost.

Key words: soft soil, ash yard, seepage prevention, numerical simulation

摘要： 为研究软土地基上贮灰场的防渗处理特性,分析软土地基沉降对防渗措施可能的影响,以东南亚某贮灰场为工程实例,采用Geo-Studio软件进行应力与渗流的耦合模拟分析。通过模拟分析软土地基上贮灰场的实际加载过程,得出了贮灰场不同区域各时段的沉降值。研究结果表明,该贮灰场的最大沉降差为3.7m,应重点关注最大沉降差区域防渗膜拉裂的可能;以1.5mm高密度聚乙烯防渗膜的渗流量为基准,10m深垂直防渗墙无法满足防渗要求,只有完全截断渗流通道时,垂直防渗墙可满足要求,但费用较高。

关键词: 软土地基, 贮灰场, 防渗处理, 数值分析