Abstract
Conventionally, in-situ permeability test by single-hole is employed to obtain the coefficient of permeability for sandy ground. However, it becomes difficult to apply this conventional method due to the complication of present construction projects, such as very deep location, short testing time afforded and use of mud drilling. Although only to clayey ground because of head loss in the system, BAT system, developed by B. A. Torstenssen, Sweden, can be basically applied to overcome these limitations presently. In this study, we improved BAT system and developed how to minimize the head loss on the basis of the fact that head loss is closely related to the velocity of groundwater flow inside the system in order to apply BAT system to sandy ground.
