發(fā)布時(shí)間：2018-09-07 06:52

【摘要】：開展金沙江干熱河谷鄉(xiāng)土草本植物根系提高土體抗剪強(qiáng)度及預(yù)測(cè)的研究,為該地區(qū)生態(tài)恢復(fù)、邊坡防護(hù)、水土流失防治等生態(tài)工程中植物選擇及其固土能力的計(jì)算提供依據(jù)。采用原位剪切試驗(yàn)測(cè)定扭黃茅(Heteropogon contortus)、莎草(Eulaliopsis binata)、蕓香草(Cymbopogon distans)、旱茅(Schizachyrium delavayi(Hack.)Bor)等4種鄉(xiāng)土草本植物根系及素土的抗剪切強(qiáng)度;用根系拉力計(jì)和電子卡尺測(cè)定根系的抗拉強(qiáng)度和直徑;用Wu和Waldron垂直根模型(WWM)及纖維束根增強(qiáng)模型(FBM)對(duì)根系提高土體抗剪能力進(jìn)行預(yù)測(cè)。結(jié)果表明:1)4種植物根系直徑約80%分布在0.1~1 mm的范圍內(nèi),扭黃茅、莎草、旱茅根系的直徑和抗拉強(qiáng)度之間成負(fù)冪函數(shù)關(guān)系,蕓香草兩者間沒有相關(guān)性。2)扭黃茅、莎草、旱茅、蕓香草的根系可將土體的抗剪強(qiáng)度分別提高20.7%、85.3%、84.4%、16.1%。3)用WWM模型預(yù)測(cè)扭黃茅、旱茅、莎草的提高土體抗剪能力,其預(yù)測(cè)值是實(shí)測(cè)值的3.59~10.83倍;用FBM模型的預(yù)測(cè)值是實(shí)測(cè)值的1.24~2.62倍。旱茅、莎草根系提高土體抗剪強(qiáng)度的能力強(qiáng)于扭黃茅和蕓香草,在干熱河谷的生態(tài)工程中可優(yōu)先選用;對(duì)根系提高土體抗剪強(qiáng)度的預(yù)測(cè),FBM模型要優(yōu)于WWM模型。
[Abstract]:The study on improving soil shear strength and prediction of native herbaceous roots in Jinsha River dry-hot valley was carried out to provide basis for plant selection and soil consolidation ability calculation in ecological engineering such as ecological restoration, slope protection, soil erosion control and so on. Heteropogon contortus and Eulaliops were determined by in-situ shear test. The shear strength of roots and plain soils of four native herbs, namely, is binata, Cymbopogon distans and Schizachyrium delavayi (Hack.) Bor, was measured by root tension meter and electronic caliper, and the tensile strength and diameter of roots were measured by Wu and Waldron vertical root model (WWM) and fibrous bundle root enhancement model (FBM). The results showed that: 1) The root diameters of the four plants ranged from 0.1 mm to 1 mm, and there was a negative power function relationship between the root diameters and tensile strength. There was no correlation between them. 7%, 85.3%, 84.4%, 16.1%. 3) WWM model was used to predict the improvement of soil shear resistance, the predicted value was 3.59-10.83 times of the measured value; the predicted value of FBM model was 1.24-2.62 times of the measured value. The FBM model is superior to the WWM model in predicting the soil shear strength.
【作者單位】： 云南農(nóng)業(yè)大學(xué)水利學(xué)院國(guó)土資源科學(xué)技術(shù)工程研究中心;河海大學(xué)水利水電學(xué)院;云南農(nóng)業(yè)大學(xué)農(nóng)學(xué)與生物技術(shù)學(xué)院;
【基金】：國(guó)土資源部國(guó)家公益性行業(yè)科研專項(xiàng)課題“立體特征突顯區(qū)域土地整治技術(shù)與建設(shè)模式研究”(201511003-3)
【分類號(hào)】：S157.43

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