Experiment Of Slope Protection Through 3D Geomat And Its Application In Small Rivers

In recent years, with the rapid development of technology and economy, humanity will face increasingly severe environmental pressures. High-speed railway, highway, water conservancy rapid development has made rapid results, but to a certain extent, to break the original ecological balance, with regard to water conservancy and hydropower project, in order to make flood control, earthquake, the cracking of the effect is more pronounced anti- effective, natural river usually dry stone revetment, slope protection for Masonry, six Ling block revetment and other types. Such slope even though it can satisfy the safety requirements of the project, but the destruction of the original water ecology, so that reduces the ability of self-purification of the river, leading to the river on both sides of the original ecosystem level was destroyed. And such projects during the construction process need to use large digging machines, forklifts, conveyors and other construction approach helps improve efficiency, it will generate a lot of exhaust, sewage and other secondary pollution, which is not conducive to the protection of ecological environment. So to find a type of eco-friendly slope into the mainstream of today’s water conservancy development ideas, the concept of ecological slope protection came into being.Three-dimensional geomat slope protection as a type of ecological slope, the more rapid development in recent years of a new type of ecological revetment. Its advantage is that it can significantly reduce the loss of soil erosion by rain, floods, space and vegetation combining network packet can reach the effect of improving the ecological environment, soil conservation soil reinforcement effect is obvious. The reason is that the complex spatial network packet structure can play a very good performance scour effect, reducing the impact of the rain and floods, mat close to the slope so that the soil particles with the flow of transport by the layers of obstacles, thus achieving protection Soil solid soil effect. When vegetation comprehensive coverage, root mat and wound more staggered vegetation very good soil slope protection, slope stabilization, ecological revetment effect.This paper mainly through artificial rainfall and river erosion site two test programs, research and analysis for soil conservation impact properties of three-dimensional geotextile mat main draw the following conclusions: rain erosion test conducted according to three commonly used in engineering slope ratio, obtained in Rainfall intensity 10mm/h of EM3-dimensional geotextile mat critical slope gradient effect should be located between 26.56 ° and 33.7 °. Erosion modulus size will increase and decrease the thickness of the mat sediment concentration increase soil erosion and soil conservation effect will make three-dimensional geotextile mat is more obvious, but erosion modulus is still very large. With the increase of rainfall intensity at 10 mm / h to 50 mm /h three-dimensional geotextile mat solid soil erosion effect is obvious, at 50 mm / h-100 mm / h effect weakened its impact. Type EM3 slope revetment mat combined with dead grass can adapt in the case of heavy rainfall can still maintain a very good soil conservation impact effects. Compared to sandy soil erosion is the cumulative amount of humus in the river scouring small, more suitable as the slope revetment soil. With the increase of soil bulk density of the slope, its impact will be more pronounced the effect will be greatly reduced due to the cumulative amount of erosion caused by river erosion and the laying of a three-dimensional geotextile mat after. With the increase of river flow will make the cumulative erosion increased, three-dimensional geotextile mat can effectively resist the flow rate is increased due to the cumulative amount of erosion generated. In the case of EM3 mat, double EM3 mat, EM3 and dead grass mat combined cumulative erosion linear relationship between the amount of time, the impact effect is EM3 mat combined with dead grass type is best. And research applied to management and planning of small rivers which, through practical engineering test three-dimensional geotextile mat suitable for use in small rivers.