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针对护坡工程及中小河流护岸建设中植被护坡抗冲性能问题,建立了深圳市葵涌河生物砖护岸结构的抗冲性能物理模型,基于有压管流最大可产生流速达6m/s,对生物砖结构进行冲刷试验。结果表明,对浸泡12h的生物砖,经3.2~5.8m/s流速冲刷12h后其抗冲性能表现良好,最大冲深为2~6cm;抗冲性能取决于水泥砖、营养土、植被之间的复合结构,其中水泥砖12cm×12cm内孔及4cm厚壁有效控制了向下螺旋流的发展,阻止了土壤冲坑的无限扩大;营养土可提高狗牙根草的植被成活率,提高植被密度;狗牙根草形成的植被覆盖层有助于减小水流对土壤的直接侵蚀。
In view of the slope protection engineering and the impact protection of vegetation slope protection in the middle and small river bank protection, the physical model of impact resistance of the bio-brick revetment structure of Kwai Chung River in Shenzhen was established. Based on the maximum flow velocity of the pressure pipe flow can reach 6m / s, Structure for erosion test. The results showed that the biofacies soaked for 12h showed good anti-scour performance after being washed by 3.2 ~ 5.8m / s for 12h, the maximum depth of penetration was 2 ~ 6cm. The anti-impact property was determined by cement bricks, Of the composite structure, in which 12cm × 12cm cement bored hole and 4cm thick wall effectively control the development of the downward spiral flow, preventing the unlimited expansion of the soil pit; nutrition soil can improve the survival rate of Bermudagrass vegetation, improve vegetation density The vegetation cover formed by Bermudagrass helps reduce the direct erosion of the soil by water currents.