平原水库堤坝渗漏工后防渗控制

发布时间：2018-10-19 12:20

【摘要】：平原水库作为北方地区主要的蓄水工程,堤坝大多是通过就地取材或就近取材修建而成的土石坝,具有围坝长、坝基透水性强、坝高低、围堤两侧水位差大等特点,普遍存在渗漏破坏问题,对堤坝的安全稳定构成严重威胁。坝基防渗是平原水库堤坝防渗的重点,有水平防渗和垂直防渗两种类型。垂直防渗是通过建立封闭的垂直防渗墙或者防渗帷幕,截断渗水通道,在一定程度上能根治渗透破坏的防渗措施,防渗效果好,在技术条件允许且经济合理的情况下应该是首选的防渗措施。而防渗墙对各种地层适应性强,造价较低,所以防渗墙是目前应用最广泛、发展最快的垂直防渗处理措施之一。由于塑性混凝土具有比刚性混凝土更为优良的协调特性和经济性,在工程实践中得到广泛应用。平原水库多采用坝前或坝顶防渗墙对堤坝进行防渗控制,但对于堤坝工后防渗控制,坝前防渗墙易污染水源,影响工程正常运行；坝顶防渗墙则工程量大,工期长,投资大。鉴于坝前及坝顶防渗墙存在的局限性,本文提出了平原水库堤坝坝后防渗墙措施。本文在查阅国内外相关文献的基础上,对平原水库堤坝的渗流破坏形式、渗流理论和渗流分析方法进行总结。以济南玉清湖水库堤坝防渗加固处理为例,选取8+430典型断面进行渗流试验研究,获取渗流分析参数和物理模型,并建立典型断面的二维有限元模型。应用有限元法进行了不同工况下的堤坝渗流计算、应力应变分析和边坡稳定分析,研究塑性混凝土防渗墙在堤坝不同位置时的防渗控制效果。
[Abstract]:As the main water storage project in the northern region, the plain reservoir is mostly earth-rock dam constructed by using local materials or the nearest material. It is characterized by the length of the surrounding dam, the strong permeability of the dam foundation, the height of the dam, the great water level difference between the two sides of the embankment, and so on. Seepage damage is a common problem, which poses a serious threat to the safety and stability of dikes. Seepage control of dam foundation is the key point of dam seepage control in plain reservoir, and there are two types of horizontal seepage control and vertical seepage control. Vertical seepage control is a kind of anti-seepage measure that can cure seepage damage to a certain extent by establishing closed vertical impermeable wall or impervious curtain and cutting off the seepage passage, and the seepage prevention effect is good. It should be the preferred anti-seepage measure when the technical conditions permit and the economy is reasonable. The impervious wall is one of the most widely used and fastest developing vertical impervious treatment measures because of its strong adaptability to various strata and low cost. Plastic concrete is widely used in engineering practice because of its better coordination property and economy than rigid concrete. In plain reservoir, the impervious wall in front of the dam or at the top of the dam is mostly used to control the seepage of the dam, but for the seepage control after the construction of the dam, the impervious wall in front of the dam is liable to pollute the water source, which affects the normal operation of the project, while the impervious wall at the top of the dam has a large amount of work, a long construction period and a large investment. In view of the limitation of the impervious wall in front of the dam and at the top of the dam, this paper puts forward the measures of the impermeable wall behind the dike and dam of plain reservoir. On the basis of consulting relevant documents at home and abroad, this paper summarizes the seepage failure form, seepage theory and seepage analysis method of plain reservoir dike. Taking the seepage prevention and reinforcement treatment of the dam of Yuqinghu Reservoir in Jinan as an example, 8 430 typical sections are selected for seepage experimental study, the seepage analysis parameters and physical models are obtained, and the two-dimensional finite element model of typical sections is established. The seepage calculation, stress strain analysis and slope stability analysis of embankment under different working conditions are carried out by using finite element method. The seepage control effect of plastic concrete impervious wall in different positions of embankment is studied.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV223.4

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