Abstract
Horizontal geosynthetic drain such as geotextile, geotextile-related product and geocomposite are employed for constructing of highly moistured clay embankment and drainage of seepage water in the existing embankment.The usage of the geosynthetic drain materials is being increased because of the shortage of natural filter sands.
In order to investigate fundamental properties of transmissivity (in-plane permeability) and permittivity (cross-plane permeability) of horizontal drain materials embedded in the embankment, a series of laboratory box permeability tests under different water heads and overburden pressures are conducted using a spunbonded geotextile, Toyoura sand and Kanto loam clayey soil.
It was found from the test results that there was a constant ratio of in-plane permeability to cross-sectional one, and the transmissivity was affected by the decrease in the thickness of geotextile under surcharge loads.
