直接剪斷試驗에 依한 土木纖維 補强土의 摩擦特性
Characteristics of geosynthetics reinforced earth by means of direct shear test
직접전단시험 토목섬유 보강토 마찰특성;
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Recently reinforced earth method using geosynthetics as a reinforcement has been getting popular and usefulness also has been increased due to reductions in costs and ease of construction and great exterior view. Geosynthetics are now being used as ground reinforcement materials all over the world, because we can make ground structures using geosynthetics economically and safely. The most important part in the earth reinforcement is the interface between soil and the reinforcement. Shear strength and shear behavior in this interface make a great role relating to the reinforcement effect. This paper presents 2 kinds of direct shear test methods. one is the strain free shear test, called 'free method', that is performed by the free condition of allowing tensile strain. The other is the strain fix shear test, called 'fixed method', that is performed by the fixed condition of not allowing tensile strain. Two reinforcements were used such as nonwoven geotextile and geogrid. That is, interfaces are composed of geogrid/sand and geotextile/sand. From the test results it shows us that the fixed method had a greater friction angle and a smaller peak shear strain than those of the free method. Residual stress of the fixed method was bigger than that of the free method but the residual stress ratio was vice versa.