【摘要】：近年來,隨著我國(guó)西部大開發(fā)戰(zhàn)略的實(shí)施,大量鐵路、公路、水利水電等工程項(xiàng)目的施工不可避免開挖出大量的工程邊坡。對(duì)于這些工程邊坡不僅要采取必要的支擋措施保證邊坡穩(wěn)定性,而且還應(yīng)對(duì)邊坡綠色防護(hù)進(jìn)行進(jìn)一步研究,以有效的恢復(fù)自然生態(tài)環(huán)境。本文主要探討草本植物根系固坡的力學(xué)機(jī)理,評(píng)價(jià)植物根系對(duì)土質(zhì)淺層邊坡土體的加固效果,為植物護(hù)坡工程提供充分的理論依據(jù)。由于植物根系有一定的影響范圍,一般小于2m,因此植物護(hù)坡主要是防護(hù)淺層不穩(wěn)定邊坡。本文以草本植物香根草根系為研究對(duì)象,探討加入根系后土體的力學(xué)特性,分析根系對(duì)邊坡穩(wěn)定性的影響。建立含根系土體的基本力學(xué)模型,并利用有限元方法對(duì)含根系土體的直接剪切試驗(yàn)和抗壓試驗(yàn)進(jìn)行了大量的數(shù)值模擬,詳細(xì)研究了含根系土體內(nèi)部各力學(xué)參數(shù)的變化規(guī)律,包括不同根系長(zhǎng)度、根系分布密度、根系傾斜角度。并對(duì)含不同根系形態(tài)的土體粘聚力和內(nèi)摩擦角,與無根系土體的粘聚力和內(nèi)摩擦角進(jìn)行了對(duì)比分析,發(fā)現(xiàn)根系垂直分布于土體中且根系數(shù)量越多、長(zhǎng)度越長(zhǎng)對(duì)土體的加固效果越好。通過對(duì)粘聚力和內(nèi)摩擦角值的變化規(guī)律研究得到不同根系形態(tài)對(duì)土體增加的抗剪強(qiáng)度的影響規(guī)律,以及不同根系形態(tài)下的根-土復(fù)合彈性模量的變化規(guī)律。最后將前面對(duì)含根系土體的參數(shù)研究應(yīng)用到實(shí)際邊坡中,采用強(qiáng)度折減法對(duì)含不同根系形態(tài)邊坡的穩(wěn)定性進(jìn)行分析,進(jìn)一步探討含不同根系形態(tài)土體的力學(xué)參數(shù)變化對(duì)邊坡穩(wěn)定性的影響規(guī)律。發(fā)現(xiàn)坡體中含有的植物根系的長(zhǎng)度越長(zhǎng)、數(shù)量越多,則邊坡穩(wěn)定性越高;根系傾斜角度越大,則邊坡穩(wěn)定性越差。通過對(duì)含不同根系形態(tài)的土體模型的基本力學(xué)性能探討,詳細(xì)研究了植物根系護(hù)坡的作用機(jī)理,并對(duì)根系加固邊坡表層土的實(shí)際效果進(jìn)行了分析,為生態(tài)護(hù)坡提供了一定的理論依據(jù)。因此,開展植物護(hù)坡技術(shù)的研究和應(yīng)用具有相當(dāng)重要的意義。
[Abstract]:In recent years, with the implementation of the western development strategy, a large number of railway, highway, water conservancy and hydropower projects inevitably excavated a large number of engineering slopes. For these engineering slopes, not only the necessary retaining measures should be taken to ensure the slope stability, but also the green protection of the slope should be further studied in order to effectively restore the natural ecological environment. In this paper, the mechanical mechanism of herbaceous root system is discussed, and the reinforcement effect of plant root system on soil mass of shallow soil slope is evaluated, which provides sufficient theoretical basis for plant slope protection project. Because the plant root system has a certain influence range, generally less than 2 m, so plant slope protection is mainly to protect shallow unstable slope. In this paper, the root system of vetiver grass was studied, and the mechanical properties of soil were studied, and the influence of root system on slope stability was analyzed. The basic mechanical model of the soil with roots was established, and the numerical simulation of the direct shear test and compression test of the soil containing root was carried out by using finite element method. The variation of mechanical parameters in the soil containing root was studied in detail. It includes different root length, root distribution density and root tilt angle. The cohesive force and internal friction angle of soil with different root forms were compared with those of non-root soil. It was found that the root system distributed vertically in soil and the number of root system increased. The longer the length, the better the reinforcement effect of soil. The influence of different root forms on the increased shear strength of soil and the variation of root-soil composite elastic modulus under different root forms were obtained by studying the change of cohesion and internal friction angle. Finally, the research on the parameters of the soil with roots is applied to the actual slope, and the stability of the slope with different root forms is analyzed by the strength reduction method. The influence of mechanical parameters of soil with different root forms on slope stability was further discussed. It is found that the longer the length and the more the number of the plant roots contained in the slope, the higher the slope stability and the worse the slope stability is. Based on the discussion of the basic mechanical properties of soil models with different root forms, the mechanism of plant root slope protection is studied in detail, and the actual effect of root system reinforcement on the surface soil of slope is analyzed. It provides certain theoretical basis for ecological slope protection. Therefore, the research and application of plant slope protection technology is of great significance.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：Q948;TU43

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 陸桂紅;楊順;王鈞;歐國(guó)強(qiáng);;植物根系固土力學(xué)機(jī)理的研究進(jìn)展[J];南京林業(yè)大學(xué)學(xué)報(bào)(自然科學(xué)版);2014年02期

2 鐘貞明;桂勇;羅嗣海;鄧通發(fā);周軍平;;植物護(hù)坡對(duì)邊坡穩(wěn)定性作用機(jī)理研究綜述[J];路基工程;2013年06期

3 諶蕓;何丙輝;向明輝;陳晶晶;;紫色土坡耕地植物籬的水土保持效應(yīng)研究[J];水土保持學(xué)報(bào);2013年02期

4 吳進(jìn)良;閆海燕;李瑤;;香根草植物根系固坡影響因素的有限元分析[J];西部交通科技;2012年12期

5 袁升;劉曙光;米有明;;植被固坡的力學(xué)初探與數(shù)值模擬[J];江西科學(xué);2012年06期

6 王艷萍;王力;衛(wèi)三平;;Gash模型在黃土區(qū)人工刺槐林冠降雨截留研究中的應(yīng)用[J];生態(tài)學(xué)報(bào);2012年17期

7 余芹芹;喬娜;盧海靜;胡夏嵩;李國(guó)榮;朱海麗;;植物根系對(duì)土體加筋效應(yīng)研究[J];巖石力學(xué)與工程學(xué)報(bào);2012年S1期

8 王斌;范茂攀;鄭毅;Michael Augustin FULLEN;李永梅;;香根草根系固土拉力的原位測(cè)定[J];云南農(nóng)業(yè)大學(xué)學(xué)報(bào)(自然科學(xué));2012年02期

9 田風(fēng)霞;趙傳燕;馮兆東;彭守璋;彭煥華;;祁連山青海云杉林冠生態(tài)水文效應(yīng)及其影響因素[J];生態(tài)學(xué)報(bào);2012年04期

10 毛妍婷;李永梅;M A Fullen;C A Booth;;狗尾草根系固土拉力的原位測(cè)定[J];土壤通報(bào);2009年03期

相關(guān)碩士學(xué)位論文 前2條

1 張橫;植物根系固坡對(duì)邊坡穩(wěn)定性影響的數(shù)值分析[D];重慶大學(xué);2011年

2 黃金;香根草生物工程技術(shù)在淺層滑坡治理中的應(yīng)用研究[D];重慶交通大學(xué);2010年

，

本文編號(hào)：2209689