土工袋砌护农田排水沟边坡的固坡模式及应用研究

发布时间：2018-04-02 11:11

本文选题：土工袋　切入点：农田排水沟　出处：《宁夏大学》2017年硕士论文

【摘要】：排水沟道边坡局部滑移、坍塌问题,已成为西北干旱、半干旱地区农田水利配套改造工程中有待解决的突出问题。以宁夏引黄灌区为例,排水沟道受流沙层以及干湿循环与冻融循环作用的影响,沟道边坡易滑塌严重,目前采用的砌护方式成本高,效果差。本文在阅读文献和实地调研灌区沟道治理工程类型的基础上,提出了将土工袋用于农田排水沟边坡砌护的新方法,通过相关室内试验研究,为土工袋技术在实践中的应用和设计提供了参数依据,介绍了土工袋砌护农田排水沟边坡的方案设计和施工工艺,通过三种不同砌护方式的原型监测试验,分析了它们的砌护效果,引用有关文献提出的土工袋柔性压坡的稳定分析方法,计算分析了不同水平宽度的土工袋压坡体对不同坡高及坡比的边坡土边坡稳定性的影响,提出了利用费伦纽斯条分法估算木桩支挡基础土工袋护坡模式以及采用复合滑动面的简化分析法估算土工袋支挡基础土工袋护坡模式边坡稳定系数的方法。取得了如下主要研究成果和结论。(1)排水沟坡体不同层土壤抗剪强度以及土与土工织物的摩擦系数均随着土壤含水率的增大而减小;土工袋组合体结构的渗透系数能达到1.45×10-2cm·s-1,远大于土的渗透系数。(2)浆砌石护坡、草土木桩护坡和土工袋护坡,三种护坡方式的边坡位移监测结果表明,土工袋护坡的边坡位移量明显小于其他两种砌护方式,其护坡效果更好。(3)相同坡高和压坡体宽度条件下,稳定安全系数随着坡比的增大而减小;相同坡高和坡比条件下,安全系数随着压坡体的增大而增大;相同坡比和压坡体宽度条件下,安全系数随着坡高的增加而降低。(4)木桩支挡基础土工袋护坡模式下的边坡稳定系数为2.18,无任何砌护模式下的边坡稳定系数为1.05,土工袋支挡基础土工袋护坡模式下的边坡的稳定系数为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.
【学位授予单位】：宁夏大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S276

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