Aging factors and influence of geotextile
Release time:
2020-07-07
The aging of geotextile refers to the influence of various external factors such as sunlight, temperature changes, biological erosion, chemical corrosion, and moisture effect on the geotextile, which gradually weakens the strength and performance of the geotextile, and then loses its function. This process is the aging of the geotextile. There are many factors that affect the aging of geotextiles, and they are also very complex, often due to the simultaneous effect of several factors. For 1: Synthetic high molecular polymers, sunlight radiation is the main factor for degradation and aging of polymers. The ultraviolet radiation in sunlight is the main cause of fabric aging. Due to the ultraviolet radiation, the high molecular polymer produces photo-oxidative decomposition reaction, especially the ultraviolet light with a wavelength of 290-400mPm (soap micron), which is very important for high molecular polymers. It has a significant decomposition effect. Because the energy of the ultraviolet light in this range of the geotextile is higher than the energy required for the breakage of the polymer chemical bun, the aging of the polymer material is very obvious. Among them, polypropylene material is less than the presence of tertiary carbon atoms in the molecular structure, and the carbon-hydrogen bond energy of tertiary carbon atoms is small and therefore unstable. Therefore, polypropylene is more sensitive to photooxidative degradation reactions. When its wavelength is between 300-310mF" (soap micron), its aging is most sensitive. The intensity of ultraviolet radiation varies with the intensity of solar radiation, and the aging speed of geotextiles also varies with ultraviolet radiation. The level and speed of radiation intensity are also related to geotextile types, structure, color, temperature, humidity, admixtures and other factors. Non-woven fabrics, especially thick fabrics, have dual functions of infiltration and drainage, which can remove the soil in the soil. Water is transported and discharged from the building along the plane of the fabric to reduce the seepage pressure and ensure the stability of the building. This is the horizontal penetration or water conduction of the geotextile. The study on the plane water conduction performance of the geotextile is based on Darcy’s law. Only applicable to laminar flow. When the hydraulic gradient is 1; 1, the permeation flow rate is the horizontal permeability coefficient along the fabric plane. The horizontal permeability coefficient of the fabric is similar to the hydraulic conductivity. Fabric type, structure, pore size, water flow state, water flow The direction, the normal pressure of the fabric, and many other factors are related! When applied in actual engineering, there will always be a certain load on the upper part of the fabric, which will change the internal structure of the geotextile. C: The fabric is composed of multiple TL gap fibers. As the pressure increases, the gap of the fabric 7L decreases accordingly.
恒盈土工
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