Research on the effect of different reinforcement methods on the surface of a granular slope
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摘要: 散粒体斜坡多发育于我国西部山区，由块度不一、黏粒含量较少的碎砾石土组成，由于胶结性差，遇雨水冲刷、风吹或人畜踩踏易失稳。传统坡面防护技术包括拦挡锚固和土工材料与植被构筑，新型护坡技术是结合了岩土材料加固和生态环境两方面所提出的新方法。本文中该新技术是指将浓度1.3%的改性钠羧甲基纤维素与边坡表层土拌合，后掺入植物纤维，喷洒到坡表形成加固层；加固层表面喷洒草籽，以达到边坡防护的目的。文章选择传统的护坡方法（格构和三维网）和新型土壤改良方法结合植草绿化技术对室外某散粒体斜坡进行加固处理，以天然斜坡为参照，统计降雨冲刷和径流冲刷后边坡表面侵蚀破坏、入渗和植被破坏特征，对比不同护坡方式的应用效果。试验结果表明：每个斜坡辅之相同的植草条件下，对比降雨和放水冲刷试验后各边坡的侵蚀破坏特征可以发现，材料改良植草边坡侵蚀弱，产沙量小，作用层能减缓雨水下渗，提高植被存活率和降低植被倒伏率，其效果优于三维网植草护坡和格构植草护坡。Abstract: Most of the granular slopes exist in western mountainous areas of China. Granular slopes, which are made up of different sizes of lumpiness and few clay particles, are easy to collapse because of weak cementation between particles, rain eroding & wind eroding or the people and animals’ tread. Traditional technologies for slope protection contain frame and geo-grid with plants. A new method involves geotechnical materials and ecological environment and focuses on the surface protection of slope by using topsoil which is stabilized with 1.3% of the modified sodium carboxymethyl cellulose (M-CMC) as well as plant fiber. Two traditional methods (rhombic frame beams and geo-grid) and this new environmental method for soil modification are used to increase the stability of a granular slope in the field in this study and natural slopes are taken as references. The values of soil loss, moisture content and vegetation deterioration rate of slopes suffering from rainfall and runoff erosion are observed and collected. Under the same condition of vegetation, it is found that the sediment yield, erosion deformation, infiltration rate of moisture and lodging rate of slope stabilized by M-CMC are much less than those of natural slopes and slopes stabilized by frame beams and geo-grid. The value of these indexes of natural slopes is less than that of frame beams and geo-grid. As a result, the slope treated with M-CMC protection is better than that with geo-grid, frame beams and natural slope.
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