Abstract
Many types of plastic-board drains have been developed. For understanding the drainage performance of these drains, large-scale consolidation tests were carried out with plastic-board drains and sand drain. Factors influencing the drainage performance of these drains were investigated focussing on: flow characteristics of pore water; consolidation of clay in the close vicinity of the drain; deformed shape of drain; migration of fine particles; well resistance; formation of smear zone and its effect on consolidation.
A two-layer smear zone model is proposed for estimating the influence of smear zone on consolidation of clay in vertical drain system.
