시멘트계 결합재가 적용된 지오텍스타일의 접촉면 전단강도 평가

초록

Multi-layered geotextile tubes may have problems on its stability when used as cofferdam. This study presents the shear strength characteristics at theinterface between geotextiles and a cementitious binder material to improve the stability of the multi-layered geotextile tubes. In this study, two differenttypes of geotextiles are used. After mixing with a rapid setting cement, fly ash, sand, accelerator, and water, the cementitious binder material is preparedat the interface between two geotextile samples and cured under water for a desired period. The specimen is placed on upper and lower direct shearboxes by using clamping systems. A series of direct shear tests for two different geotextiles are performed along the curing time under three verticalstresses. Experimental results show that the shear strength at the interface between the cementitious binder material and geotextiles is greater than thatat the interface between two geotextiles. For two types of geotextiles, apparent cohesion occurs at the interface between the cementitious binder materialand geotextiles. In addition, the friction angles for any curing time are improved, compared to the interface between two geotextiles. The cementitiousbinder material suggested for the interface between two geotextiles may be useful for the reinforcement of multi-layered geotextile tubes.

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