本文選題：淺層滑坡　切入點(diǎn)：生態(tài)護(hù)坡　出處：《工程科學(xué)與技術(shù)》2017年S1期

【摘要】：植物是天然的工程師,擁有防止淺層滑坡和地表侵蝕的潛能,并具備低投入、低養(yǎng)護(hù)、綠色環(huán)保和生態(tài)平衡等優(yōu)點(diǎn)。植被護(hù)坡技術(shù)在西南地區(qū)淺層滑坡的預(yù)防及治理中有著廣泛的應(yīng)用前景,因此深入了解植被護(hù)坡機(jī)理具有重要的工程意義。影響植被護(hù)坡效應(yīng)的因素有很多,根-土體系的協(xié)同作用機(jī)制是當(dāng)前研究的重點(diǎn)。由于根系的分布模式及傾角不同,根-土體系的強(qiáng)度和變形會(huì)有較大差異,因此采用人工根系(草根和灌木根)制備試樣并設(shè)定根系與剪切面的夾角α值為變量,對(duì)比不同試樣的強(qiáng)度和變形差異。通過(guò)直剪試驗(yàn)研究草本根系傾角對(duì)土體抗剪強(qiáng)度的影響,通過(guò)三軸剪切試驗(yàn)研究灌木根系傾角對(duì)土體抗剪強(qiáng)度的影響。試驗(yàn)結(jié)果表明:含根系土樣的峰值強(qiáng)度及殘余強(qiáng)度均明顯高于素土,具有τ_(p素土)τ_(p90°)τ_(p45°)τ_(p135°)的規(guī)律;直剪試驗(yàn)中在α值等于135°時(shí)土樣抗剪強(qiáng)度最高且表現(xiàn)出應(yīng)變硬化,其余含根系試樣應(yīng)變軟化特征均得到不同程度的抑制;三軸試驗(yàn)中當(dāng)α值為135°時(shí)根系對(duì)土體抗剪強(qiáng)度的提高最為明顯,其殘余強(qiáng)度也最大,其余含根系試樣抗剪強(qiáng)度也有不同程度提高。恰當(dāng)?shù)闹参锔祪A角能夠加強(qiáng)根-土體系的協(xié)同作用,從而提高土體抗剪強(qiáng)度。同時(shí)由于根-土體系表現(xiàn)出延性破壞的特征,從而保證了土坡安全。研究結(jié)果可應(yīng)用于生態(tài)護(hù)坡實(shí)踐。
[Abstract]:Plants are natural engineers, have the potential to prevent shallow landslides and surface erosion, and have low input, low conservation, The technology of vegetation slope protection has a broad application prospect in the prevention and treatment of shallow landslides in southwest China. Therefore, it is of great engineering significance to understand the mechanism of vegetation slope protection. There are many factors that affect the slope protection effect of vegetation. The cooperative mechanism of root-soil system is the focus of current research. The strength and deformation of root-soil system will vary greatly. Therefore, artificial root system (grass root and shrub root) is used to prepare samples and the angle 偽 between root and shearing surface is set as variable. The effect of root inclination angle of herbaceous on shear strength of soil was studied by direct shear test. The effect of shrub root inclination on the shear strength of soil was studied by triaxial shear test. The results showed that the peak strength and residual strength of soil samples containing roots were obviously higher than that of plain soil, and had the regularity of 蟿 _ T _ P _ 90 擄) 蟿 _ T _ (45 擄) 蟿 T _ (135 擄)). In direct shear test, when 偽 = 135 擄, the shear strength of soil samples was the highest and showed strain hardening, and the strain softening characteristics of other root samples were inhibited to varying degrees. In triaxial test, when 偽 value is 135 擄, the root system has the most obvious increase in shear strength of soil, and its residual strength is also the largest. The shear strength of other root samples was also increased to some extent. Proper plant root inclination could enhance the synergistic effect of root-soil system, thus enhancing the shear strength of soil. At the same time, the root-soil system showed the characteristics of ductile failure. The research results can be applied to ecological slope protection practice.
【作者單位】： 四川大學(xué)水利水電學(xué)院水力學(xué)與山區(qū)河流開發(fā)保護(hù)國(guó)家重點(diǎn)實(shí)驗(yàn)室;南京水利科學(xué)研究院水利部土石壩破壞機(jī)理與防控技術(shù)重點(diǎn)實(shí)驗(yàn)室;深圳市益田集團(tuán)股份有限公司;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51579167) 水利部行業(yè)專項(xiàng)資助項(xiàng)目(201301022);水利部土石壩破壞機(jī)理與防控技術(shù)重點(diǎn)實(shí)驗(yàn)室開放基金項(xiàng)目資助(YK915003)
【分類號(hào)】：Q948;TU411.7
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本文編號(hào)：1683458