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  本文選題：土工袋　切入點：農(nóng)田排水溝　出處：《寧夏大學(xué)》2017年碩士論文

【摘要】：排水溝道邊坡局部滑移、坍塌問題,已成為西北干旱、半干旱地區(qū)農(nóng)田水利配套改造工程中有待解決的突出問題。以寧夏引黃灌區(qū)為例,排水溝道受流沙層以及干濕循環(huán)與凍融循環(huán)作用的影響,溝道邊坡易滑塌嚴(yán)重,目前采用的砌護方式成本高,效果差。本文在閱讀文獻和實地調(diào)研灌區(qū)溝道治理工程類型的基礎(chǔ)上,提出了將土工袋用于農(nóng)田排水溝邊坡砌護的新方法,通過相關(guān)室內(nèi)試驗研究,為土工袋技術(shù)在實踐中的應(yīng)用和設(shè)計提供了參數(shù)依據(jù),介紹了土工袋砌護農(nóng)田排水溝邊坡的方案設(shè)計和施工工藝,通過三種不同砌護方式的原型監(jiān)測試驗,分析了它們的砌護效果,引用有關(guān)文獻提出的土工袋柔性壓坡的穩(wěn)定分析方法,計算分析了不同水平寬度的土工袋壓坡體對不同坡高及坡比的邊坡土邊坡穩(wěn)定性的影響,提出了利用費倫紐斯條分法估算木樁支擋基礎(chǔ)土工袋護坡模式以及采用復(fù)合滑動面的簡化分析法估算土工袋支擋基礎(chǔ)土工袋護坡模式邊坡穩(wěn)定系數(shù)的方法。取得了如下主要研究成果和結(jié)論。(1)排水溝坡體不同層土壤抗剪強度以及土與土工織物的摩擦系數(shù)均隨著土壤含水率的增大而減小;土工袋組合體結(jié)構(gòu)的滲透系數(shù)能達到1.45×10-2cm·s-1,遠大于土的滲透系數(shù)。(2)漿砌石護坡、草土木樁護坡和土工袋護坡,三種護坡方式的邊坡位移監(jiān)測結(jié)果表明,土工袋護坡的邊坡位移量明顯小于其他兩種砌護方式,其護坡效果更好。(3)相同坡高和壓坡體寬度條件下,穩(wěn)定安全系數(shù)隨著坡比的增大而減小;相同坡高和坡比條件下,安全系數(shù)隨著壓坡體的增大而增大;相同坡比和壓坡體寬度條件下,安全系數(shù)隨著坡高的增加而降低。(4)木樁支擋基礎(chǔ)土工袋護坡模式下的邊坡穩(wěn)定系數(shù)為2.18,無任何砌護模式下的邊坡穩(wěn)定系數(shù)為1.05,土工袋支擋基礎(chǔ)土工袋護坡模式下的邊坡的穩(wěn)定系數(shù)為1.56。
[Abstract]:The problem of local slip and collapse of drainage ditch slope has become an outstanding problem to be solved in the irrigation and water conservancy reconstruction project in arid and semi-arid areas of northwest China. Taking Ningxia Yellow River diversion Irrigation area as an example, Due to the influence of quicksand layer, dry and wet cycle and freeze-thaw cycle, the gully slope is easy to slide and the cost of the current masonry protection is high. The effect is poor. Based on reading the literature and investigating the types of irrigation district channel control project, this paper puts forward a new method of applying geotextile bags to the protection of farmland drainage ditch slope, and through relevant laboratory experiments, This paper provides the parameter basis for the application and design of soil bag technology in practice, introduces the scheme design and construction technology of soil bag to protect farmland drainage ditch slope, and through the prototype monitoring test of three different masonry protection methods. In this paper, the effect of masonry protection is analyzed, and the stability analysis method of flexible embankment slope of geotextile bags proposed by relevant literature is used to calculate and analyze the influence of different horizontal widths on the stability of slope soil slope with different slope height and slope ratio. In this paper, the method of estimating the slope protection model of retaining foundation of wood pile by Fellenius strip method and the simplified analysis method of composite sliding surface to estimate the slope stability coefficient of soil bag protection mode of retaining foundation with soil bag support are put forward. The main research results and conclusions are as follows: (1) the shear strength and friction coefficient between soil and geotextile in different layers of drainage ditch slope decreased with the increase of soil moisture content; The permeability coefficient of the soil bag combination can reach 1.45 脳 10-2cm s-1, which is much larger than the permeability coefficient of soil. 2) the slope displacement monitoring results of three kinds of slope protection methods are as follows: masonry slope protection, straw soil pile slope protection and soil bag slope protection. The displacement of the slope of soil bag is obviously smaller than that of the other two types of masonry, and the slope protection effect is better. 3) under the same slope height and the slope pressure width, the stability safety coefficient decreases with the increase of slope ratio, and the stability safety coefficient decreases with the increase of slope ratio under the same slope height and slope ratio. The safety factor increases with the increase of slope pressure, and under the condition of the same slope ratio and slope pressure width, Safety factor decreases with the increase of slope height.) the slope stability coefficient of wood pile retaining foundation soil bag is 2.18, the slope stability coefficient without any masonry protection mode is 1.05, and the soil bag branch retaining foundation soil bag slope protection mode is 2.18. The stability coefficient of the slope is 1.56.
【學(xué)位授予單位】：寧夏大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：S276

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