Abstract

Laboratory vacuum dynamic consolidation tests were performed to study the effect of dynamic impact loads on the shear strength characteristics of dredger fill. The results revealed that the shear strength increased with the increase in the number of blows. The relationship between the increase in the shear strength and the soil structure was analyzed through scanning electron microscopy and mercury intrusion porosimetry. The structure collapsed progressively and the larger inter-aggregate pores were affected the most. Considering pore evolution, the pore size distribution was primarily unimodal, and the variations in porosity and shear strength with the blow count were the same. Thus, the shear strength of dredger fill is influenced by its structure. On average, five blows ensure high compaction efficiency.

摘要

进行了实验室真空动态固结试验，以研究动态冲击载荷对挖泥船填料抗剪强度特性的影响。结果表明，剪切强度随着打击次数的增加而增加。通过扫描电镜和压汞法分析了剪切强度的增加与土壤结构的关系。结构逐渐坍塌，其中较大的团聚体间孔隙受到的影响最大。考虑到孔隙演化，孔径分布主要是单峰的，孔隙率和剪切强度随打击次数的变化是相同的。因此，挖泥船填料的抗剪强度受其结构的影响。平均而言，五次打击可确保高压实效率。