發(fā)布時(shí)間：2018-03-15 05:40

  本文選題：線域工程　切入點(diǎn)：植被　出處：《中南大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：摘要：我國(guó)泥石流廣泛發(fā)育且危害嚴(yán)重,其對(duì)公路、鐵路等線域工程運(yùn)營(yíng)安全威脅尤為突出。目前國(guó)內(nèi)外現(xiàn)行規(guī)范中缺乏植被對(duì)線域泥石流成因的系統(tǒng)論述,以致沿線生態(tài)防治工程缺乏可靠依據(jù)。本文以廣州至樂(lè)昌高速公路為研究區(qū),開(kāi)展了沿線泥石流致災(zāi)過(guò)程中植被影響的分析與生態(tài)防治措施建議,本文主要工作和研究成果如下： (1)基于樂(lè)廣高速公路沿線多條泥石流溝的現(xiàn)場(chǎng)調(diào)查及本區(qū)基礎(chǔ)資料的收集,分析了植被在泥石流孕災(zāi)環(huán)境中的作用,重點(diǎn)探討了植被對(duì)泥石流物源和水源約束的抑災(zāi)作用。 (2)基于已有植被對(duì)泥石流形成條件、活動(dòng)特征的研究成果,通過(guò)大瑤山隧道口泥石流災(zāi)例,進(jìn)行了植被對(duì)泥石流發(fā)展、演化過(guò)程中力學(xué)性能影響的分析。基于摩擦力學(xué)理論,構(gòu)建了根系加筋效果的試算方法,并對(duì)災(zāi)例中杉木對(duì)泥石流物源加固力的計(jì)算。 (3)針對(duì)現(xiàn)場(chǎng)調(diào)研中松柏樹(shù)未受破壞現(xiàn)象,構(gòu)建了松柏樹(shù)對(duì)泥石流物源加固作用的plaxis有限元模型,模擬了松柏根系生長(zhǎng)方向及樹(shù)種間距對(duì)物源加固作用的影響,數(shù)值分析結(jié)果表明：根系垂直坡面生長(zhǎng)效果最佳。同時(shí)得到加固效果最佳的松柏間距。 (4)針對(duì)泥石流研究區(qū)淺根系竹子成片破壞現(xiàn)象,考慮了風(fēng)荷載作用,參照路基病害中的翻漿冒泥病害,得到了竹子在臺(tái)風(fēng)暴雨作用下將加速裂縫開(kāi)展及降雨入滲的破壞機(jī)理及對(duì)泥石流啟動(dòng)的促進(jìn)作用。 (5)分析并總結(jié)植被影響下泥石流對(duì)橋梁工程致災(zāi)模式,提出了植被在泥石流爆發(fā)過(guò)程中的減災(zāi)作用及其對(duì)泥石流承災(zāi)鏈的改變作用。針對(duì)樂(lè)廣高速研究區(qū)泥石流工程實(shí)際,提出泥石流生態(tài)防治建議,為泥石流災(zāi)害防災(zāi)減災(zāi)提供了一定理論依據(jù)。
[Abstract]:Abstract: landslides in China are widely developed and serious damage to the highway, railway line, threatening the safety of domain engineering operation is particularly prominent. At home and abroad in the current specification lack of vegetation on the formation of debris flow system on line, the lack of reliable basis that the ecological control project. Based on the Guangzhou Lechang expressway as the research area, carried out the debris flow analysis and ecological control measures in the process of disaster affected, the main work and research results are as follows:
(1) based on the field investigation of several debris flow gullies along the Yue Guang Expressway and the collection of basic data in this area, the role of vegetation in the disaster environment of debris flow is analyzed, and the disaster suppression effect of vegetation on debris flow and source restraint is mainly discussed.
(2)鍩轟簬宸叉湁妞嶈瀵規(guī)償鐭蟲(chóng)祦褰㈡垚鏉′歡,媧誨姩鐗瑰緛鐨勭爺絀舵垚鏋，

本文編號(hào)：1614699