生态护坡条件下坡角对边坡产流产沙规律影响的试验研究

Experiment on the effect of rule caused by slope angle on sand and runoff under the condition of ecological protected slope

以粘土和工程常用草种狗牙根、百喜草和白三叶为试验材料,利用自主研制的一种模拟降雨条件下生态岩土力学护坡试验装置,开展了生态岩土力学护坡条件下坡角对边坡产流产沙规律影响的试验研究,基于传统的径流量和产沙量的测量方法,分析了生态岩土力学护坡及一定雨强条件下坡面的产流产沙的演化规律。试验结果表明:不同坡度的各种工况下,边坡的侵蚀产沙变化趋势基本一致。百喜草和狗牙根的护坡效果明显,可作为护坡工程的优选草种,白三叶抗性较差,护坡效果不理想,工程用时要谨慎选择。对4种工况在不同坡度下的总产沙进行分析,得出坡度在35°左右时,各种工况的产沙量到达最大。这对于护坡工程的设计建设和运营提供了可靠的技术支持,同时为进一步探讨生态护坡产流产沙理论及本构模型的构建提供了参数依据。

Taking clay and Bermuda grass,Bahia grass and white clover as test material,using a rainfall simulation test device carried out an experiment for slope runoff and sand in different slope conditions.Based on the traditional measuring method,the paper analyzed the rules on production of sand and runoff under ecological protection and a certain rainfall intensity condition.The results showed that：Under different slope,the trends of slope erosion and sand change were basically consistent.Slope protection effect of using Bahia grass and Bermuda grass is obvious and can be take as a preferred grass species in the slope protection works,but less resistant white clover should be carefully selected in the project.Through analysis of the four conditions in total sand output under different slopes ,the sand output under 35 ° slope in the various conditions reached the maximum.The paper can provide a reliable technical support for concrete slope protection design and operation and a basis for further exploring ecological theory in sand and runoff and constitutive model.