2018 Volume 74 Issue 1 Pages 20-33
The purpose of this study is to develop a new earth reinforcement technology using spiral bladed drain pipes called “SDPR method”, which has both functions of an earth reinforcement to increase a pulling resistance with the spiral shape blades and a drainage pipe to lower a ground water level in the embankment.
This paper summarizes the field test results of pull-out test and the observation of water retention characteristics for the expressway embankment with SDPRs. The pull-out test confirms that the friction resistance between the single SDPR and ground can be provided for the stability design of the embankment with SDPRs. The field observation of suction and volumetric water content in the embankment with/without SDPRs confirms the effectiveness of the SDPR method about the drainage performance, lowering of the ground water level and the quick restoration of the suction.