陕南千枚岩地区护坡基材优化及抗侵蚀性能

Optimization of slope protection substrate and anti erosion performance in the phyllite areaof Southern Shaanxi

为了进一步探究适宜于陕南千枚岩地区的边坡生态防护基材,以陕南当地废弃的千枚岩碎石为主要基材,添加秸秆、硅酸盐水泥、有机肥、草炭土和保水剂,组成护坡基材。设计正交试验,选取陕南地区的乡土草本植物高羊茅作为试验草种进行盆栽种植。运用综合评分法和极差分析法分析护坡基材的最佳配比和各因素对高羊茅生长影响的重要性程度,最后用室内模拟降雨侵蚀试验来验证基材的强度。结果表明,在陕南地区,适合高羊茅生长的最优基材配比为秸秆含量4%、水泥含量4%、有机肥含量5%、草炭土含量8%、保水剂含量0.25%。根据极差结果分析可知,各因素对高羊茅生长因素的影响从大到小依次为水泥、秸秆、草炭土、保水剂、有机肥。室内模拟降雨侵蚀试验表明,本研究的护坡基材具有较好的抗侵蚀能力,实用性较强。

In order to further explore the suitable slope ecological protection substrate for the Southern Shaanxi phyllite area,the aban-doned phyllite gravel in Southern Shaanxi was used as the main substrate,and straw,cement,organic fertilizer,peat soil,and water retaining agent were added to form the slope protection substrate.An orthogonal experiment was designed and the local herbaceous plant tall fescue from Southern Shaanxi was selected as the experimental grass species for potted planting.Using comprehensive scoring method and range analysis method to analyze the optimal ratio of slope protection substrate and the importance of various factors on the growth of tall fescue,and finally indoor simulated rainfall erosion test was used to verify the strength of the substrate.The results showed that in the Southern Shaanxi region,the optimal substrate ratio suitable for the growth of tall fescue was 4%straw content,4%cement content,5%organic fertilizer content,8%peat soil content,and 0.25%water retaining agent content.According to the analy-sis of range results,it could be concluded that the factors affecting the growth of tall fescue were cement,straw,peat soil,water re-taining agent,and organic fertilizer in descending order.The indoor simulated rainfall erosion test showed that the slope protection sub-strate in this study had good erosion resistance and strong practicality.