A Case Study on the Adaptation of Soil-cement for the Subgrade Treatmentin the Seohean-Expressway

Chang, Yong-Chai; Kim, Hong-Jong; Jeon, Han-Yong

Journal of Navigation and Port Research 2003;27(4):485-489.
Published online September 30, 2003.

서해안 고속도로의 노상처리를 위한 Soil-cement 적용 사례연구

장용채, 김홍종, 전한용

A Case Study on the Adaptation of Soil-cement for the Subgrade Treatmentin the Seohean-Expressway

Yong-Chai Chang, Hong-Jong Kim, Han-Yong Jeon

Abstract

The region of Kochang (Chollabuk-Do) located in the west-southern area of the Korea and passed by the West Coast Expressway has the yellow collar soil(Hwang-To) primarily containing clay. Hwang-To servers as a soil appropriate for growing the watermelon and yam, but as a subgrade material not strong for constructing the roads. Particularly, the subgrade material of this study site was not qualified for the standard of the subgrade material quality. The properties of the subgrade layer showed that the strength of the subgrade material was not strong enough to sustain the subgrade strength in constructing the roads since the passing ration of the No. 200 sieve was about 25％ to 82％ and the ground water level was nearly equal to subgrade one. Thus, the objective of this study was to present the methods obtaining the proper subgrade strength of cutting area to construct the secure and solid expressways in the fragile area.

Key Words: Subgrade material;Cutting area;Standard of material quality;Ground water level;Moisture contents;Subgrade strength