The Design of the Vertical Sand Drain

Tóm tắt

DOI: https://doi.org/10.66195/mtu.2025.14.085

A vertical sand drain is designed to allow fluids to drain from clay or silty soil by drilling a hole and filling it with sand or gravel. Sand drains are required for building in places where drainage is limited due to extremely fine soils, such as clay or silt. Therefore, when assessing design assumptions and construction costs to determine whether sand drain stabilization is feasible for a particular project, the impact of the sand drain installation method on the in situ characteristics of the subsoil being treated is crucial. It is the purpose of this paper to review the design of sand drain installations for use in foundation stabilization with or without using sand drain piles. The results show that untreated soil consolidates slowly in two cases (H = 6m and 12m), especially for deeper layers, requiring nearly 1000 days to reach approximately 60% consolidation while sand drain treatment dramatically reduces consolidation time; in the treated case with SD = 1.5m achieves near-complete consolidation within approximately 100 days, and another case reaches similar consolidation levels within approximately 200 days with SD = 2m. The findings suggest that reducing sand drain spacing and employing sand drain treatment effectively reduce consolidation time, which is essential for construction projects involving soft soil layers.