植生混凝土河道护坡性能试验研究

Experimental Study on River Course Sloped-protection Performance of Planted Concrete

在前期试验的基础上,选取高羊茅作为植生混凝土的种植物;选用16~20,20~25,25~30mm 3种粒径粗骨料;设置1∶1,1∶32种边坡坡度;选取普通土体、植生混凝土表层未覆土未植草、植生混凝土表层覆土未植草、植生混凝土表层覆土植草4种土体,通过模拟降雨对植生混凝土护坡性能进行研究。研究结果表明,种植物根系具有较强的固结土壤能力,对提高护坡性能有利;当采用植生混凝土且表层覆土植草时,可减少土质边坡85%左右的土质损失;当采用植生混凝土且坡度为1∶3时,抗反滤作用最好,拦截率最高可达98%;植生混凝土无论表层是否覆土均对固体污染杂质有较好的拦截作用,其中覆土植生混凝土拦截能力最好。

On the basis of the previous experiments,the seeds of fescue were selected as the plants for planted concrete.Three kinds of coarse aggregate with diameter such as 16~20,20~25,25~30mm and two kinds of side slope’s modulus such as 1∶1 and 1∶3 were selected.In this paper,four kinds of soil such as common soil,non-topsoil without sowing,topsoil without sowing and topsoil with sowing were selected.The sloped-protection performance of planted concrete is mainly studied by simulating rainfall.The results show that the root systems has a strong ability to consolidate the soil,which is beneficial to the improvement of sloped-protection performance.When the planted concrete is covered with topsoil and plants,the percentage of soil loss can be reduced by more than 85%.When the modulus of slope is 1∶3,the effect of anti-filtration is the best and the interceptional rate is up to 98%.No matter whether the surface of the planted concrete is covered with soil or not,it has a good intercepting effect on the solid pollution impurity,among which the planted concrete covered with soil has the best ability to intercept.