ジオシンセティック排水補強材の水理特性 （第１報） フィルターに用いる不織布と織物の開孔径

Abstract

Recently, various types of composite materials named geocomposite have been developed in the field of geosynthetics. For example, the conventional reinforcement materials have only a reinforcement function. However, composite materials that can be used also as the drainage and consolidation materials as well as reinforcement materials are required recently.In the development of composite drain materials, the choice of filter medium becomes the most important problem, and it is necessary to choice the materials that does not occur the clogging and has the superior permeability in vertical direction.The clogging phenomenon is discussed on the relationship between pore size of filter medium and the grain size ofsoil or its distribution. Typical types of geosynthetic filter are nonwovens and woven fabrics, they a are used widely. Andthere are many process parameters to manufacture those textiles, the pore structure is changed remarkably by varying the process parameters. As a result, pore size of geosynthetics are influenced by process parameters. However, there is few study to investigate systematically the pore size of nonwovens and woven fabrics used in civil engineering.In this paper, we investigate the pore size of nonwovens and woven fabrics made by varying manufacturing parameters to make use of designing filter medium for composite drain materials with drainage and reinforcement effects.