三维土工网垫设计指标的研究

Study on the design indexes of three dimensional geomat

三维土工网垫作为一种新型的坡面防护植草材料,在土木工程各领域得到广泛地应用。然而三维网垫的选择研究却远远落后于应用。不同强度、厚度、开口尺寸的网垫产品的抗冲刷与植被性能是不一样的。首先,从水力学、土力学、水文学及工程力学等方面推导了网垫强度公式,进而,从网垫厚度测量及网垫厚度对长草的影响得出网垫的较优厚度,最后,通过冲刷模型试验得到了合理的网垫开口尺寸,在一定程度上解决了三维网垫设计指标的选择问题。

Three dimensional geomat, as a new kind of geosynthetics for slope protection and planting, has been widely used in many fields of civil engineering. However, there are many problems in the application of geomat, particularly the choice of products lags behind the application in the engineering practice by far. The products with different strengths, thicknesses and porosities have different performance of erosion-resisting and vegetation protection. In this paper, first, based on the knowledge of hydraulics, soil mechanics, hydrology and engineering mechanics, strength design formula of geomat is deduced. Further more, by analyzing the thickness measurement and the effect of thickness on planting, satisfactory thickness of geomat is obtained. At last, through the erosion model test, appropriate porosity of geomat is found. So the problem of design indexes of geomat is solved in a way.