Model test on filtration fabrics of drainage board improving soft soil.

For the soft soil reinforcement under vacuum preloading, the plastic drainage board is convenient for construction, has stable quality, and can be mass production, etc., it is usually used as vertical drainage channel of vacuum preloading technology. However its filter fabrics have wide varieties and great difference of performance. To explore the influence of different filter fabrics to vacuum preloading, we designed single well model test to study three kind filter fabrics. The results show that the seepage path is shorter, the soil pore and filter fabrics are smoother the effect of vacuum improve soft foundation is better. The filter fabrics with bigger aperture have strong ability to resist siltation so the effect of disposing soft soil is better. The filter fabrics whose fibers are strong can resist mechanical deformation and soft foundation improved well. During the test, the soil next to the vertical drainage channel run away and the aperture is bigger the distance is shorter the greater the loss of soil. [ABSTRACT FROM AUTHOR]