| Title |
Unsaturated Permeability Characteristics of Silty Sand on the Nak-dong River |
| Authors |
김영수(Kim, Young-Su) ; 신지섭(Shin, Ji-Seop) |
| DOI |
https://doi.org/10.12652/Ksce.2012.32.1C.007 |
| Keywords |
불포화토;모관흡인력;투수계수;실트질 모래 unsaturated soil;matric suction;permeability;silty sand |
| Abstract |
In this paper, using the principle of Static Measurement Methods suggested by Huang (1998), a new experimental device has been made and used in order to calculate the unsaturated permeability of Nak-dong river sand with silt which is an important basic property in the unsaturated soil. This device was designed to measure changes of the unsaturated permeability according to the increase of matric suction. The value of the unsaturated permeability obtained in testing and that obtained using the empirical permeability functional formula were compared and analyzed. As a result, the value of the unsaturated permeability tends to be decreased according to the increase of relative density, silt content and matric suction. This tendency shows it is very closely related to the change of moisture content and void ratio. The empirical permeability functional formula presented by Frelund & Xing (1995) was regarded as the most appropriate model to represent the unsaturated permeability of Nak-dong River silty sand. |