软质岩边坡挂网植草绿化防护技术研究

Study on the Soft Rock Slope Protection with Grass Covered by Net

挂网植草解决了红砂岩、紫砂岩等软质岩石坡面因没有土层而不能绿化的难题。在经平整的软质岩石边坡上,铺粘10～15cm厚的泥浆层,满植规格为40×40cm狗牙根(Cynodon dactylon)、假俭草(Eremochloa ophiuroides)、结缕草(Zoysia japonica)等具有匍匐枝茎、耐瘠薄土壤、有良好的水土保持力等特性的草皮,草层上盖2.5×30m高强度的专用塑料网,用钢钉和竹签加以固定,造价为28～30元/m^2,是混凝土喷射、窗式护面墙等其它防护方法成本的1/3～1/5。在京珠、潭邵等高速上推广了近400 000 m^2,能在最短的时间内恢复植被,形成优美的景观,又能发挥较好的生态防护作用。该技术材料来源广、工艺操作易、实用性强,可广泛应用于公路、铁路、水库、堤坡等软质岩石地段的景观绿化与生态防护。

Grass planting covered by hanging net addressed the problem of greening over the red sandstone, purple sandstone and other soft rocks slopes without soil layer. Up to 10-15 cm in thickness of mud layer was laid on the leveled soft rocks. Subsequently such infertility - resistance and water retaining grass species with stolon as Cynodon dactylon, Eremochloa ophiuroides, Zoysia japonica were used. The size of the grass block was 40 cm by 40 cm. Then special plastic net of high strength, with the size of 2. 5 x 30 m, was applied to cover the grass, which was fixed with steel nail and bamboo sticks. The cost of this greening method was only 28-30 yuan RMB per m2, which was about one third to one fifths of that of radiate concrete protection wall in the shape of windows or other protection methods. This greening method was applied on about 400 thousand square meters of both Beijing - Zhuhai Express Way and Xiangtan-Shaoyang Express Way. The vegetation could be restored in the shortest period of time and nice view established. At the same time, the grass could generate effective ecologic protection impact. This greening method was featured by plentiful material resources, simple techniques and easy manage- ment and pragmatizing. Thus it can be widely applied over road, railway, reservoir and dyke with soft rock slope for the purpose of landscape greening and ecological protection.