These three kinds of materials all belong to the category of geo synthetic materials. According to whether there is a clear latitude and longitude lines, it is divided into non-woven fabric and spun (or woven) fabric. Under normal circumstances, we often use nonwoven geotextile to filter, making water penetrate. However, small soil particles can't penetrate. This method is often used on the back surface of the dam. Prevent water from carrying away the fine particles in soil, thus forming large permeability channel. Woven fabric is often used as reinforcement in the project to increase the strength of the soil in a certain direction. The apperance of geotechnical cloth, especially the appearance of non-woven fabrics is like ordinary cotton (not necessarily accurate). Colors are usually described as white. Also some impurities.
The indicators of porous composite membrane of two fabrics membrane: breaking strength 5kn, bursting 1.1kn, tearing 0.15kn, stripping 6n/cm or stripping is not found in breaking of base material. 2008 standard gram weight has required that the original standard should be lower than 360g.
