本文選題：喬木根系 + 阻滑效應(yīng)　； 參考：《應(yīng)用力學(xué)學(xué)報(bào)》2017年01期

【摘要】：喬木根系在土中所處位置不同,其對(duì)土體的強(qiáng)化作用以及自身的變形情況也就不同。通過(guò)自行研制的可用于模擬不同深度淺層滑動(dòng)面的層疊式根土復(fù)合體直剪儀對(duì)�？谙鹉z樹(shù)(喬木)直根進(jìn)行了根土復(fù)合體大型直剪試驗(yàn),得到了不同深度剪切面處根系對(duì)土體的強(qiáng)化效果以及根系通長(zhǎng)范圍內(nèi)的變形情況。試驗(yàn)結(jié)果表明:喬木根系的存在有助于提高土體的強(qiáng)度和具備阻止或延緩小型淺層滑坡產(chǎn)生的能力;喬木根系的變形主要集中在相鄰剪切面之間,此范圍之外基本無(wú)變形;隨著剪切深度的下移,深入穩(wěn)定土層的根系長(zhǎng)度則逐步減少,含根土所能承受的推力值不降反升;樹(shù)根的存在可改變土體的破壞曲線形式,出現(xiàn)應(yīng)變硬化現(xiàn)象;前后根系在土中的變形并不一致,剪切面處前根的變形始終最大,剪切面之上前根變形小于后根,剪切面及其之下前根變形大于后根。試驗(yàn)結(jié)果得出,喬木根系可對(duì)邊坡的穩(wěn)定性起到積極作用,有阻止或延緩邊坡下滑的趨勢(shì),其試驗(yàn)數(shù)據(jù)及結(jié)論可為喬木根系在淺層滑坡中的錨固理論提供依據(jù)。
[Abstract]:The different position of tree root system in soil, its strengthening effect on soil and its own deformation are also different.The large scale direct shear test of Hevea haikou (Arbor) direct root composite was carried out by using a laminated direct shear instrument which can be used to simulate the shallow sliding surface of different depth. The direct shear test was carried out on the straight root of Hevea (Arbor) in Haikou.The reinforcement effect of root system on soil at different depth shear plane and the deformation in the range of root length were obtained.The results show that the root system of Arbor helps to improve the strength of soil and has the ability to prevent or delay the formation of small shallow landslide, and the deformation of root system of Arbor is mainly concentrated between adjacent shear planes, and there is no deformation outside this range.With the shear depth moving down, the root length of the deep stabilized soil layer decreases gradually, and the thrust value of the root soil increases instead of decreasing, the existence of tree root can change the failure curve of soil, and strain hardening occurs.The deformation of the front root in the shear plane is always the largest, the deformation of the front root in the shear plane is smaller than that of the posterior root, and the deformation of the front root in the shear plane and its lower root is greater than that in the rear root.The experimental results show that the root system of Arbor can play a positive role in the stability of the slope and has a tendency to prevent or delay the slide of the slope. The experimental data and conclusions can provide a basis for the anchoring theory of the root system of Arbor in shallow landslide.
【作者單位】： 海南大學(xué)土木建筑工程學(xué)院;中建三局集團(tuán)有限公司;
【基金】：“十二五”國(guó)家科技支撐計(jì)劃課題(2013BAK05B00) 中西部計(jì)劃學(xué)科建設(shè)項(xiàng)目(ZXBJHXK011) 海南省社會(huì)發(fā)展科技專(zhuān)項(xiàng)項(xiàng)目(SF201456) 海南省科協(xié)青年科技英才創(chuàng)新計(jì)劃項(xiàng)目(201506)
【分類(lèi)號(hào)】：P642.22

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