混凝土面板堆石坝应力变形分析与面板分缝影响研究

发布时间：2018-05-23 14:06

本文选题：面板堆石坝 + 非线性有限元　；参考：《西北农林科技大学》2014年硕士论文

【摘要】：混凝土面板堆石坝由于其具有较高的安全性、较好的经济性和较广的适应性，成为发展最为迅速一种坝型。开展混凝土面板堆石坝应力应变分析和面板分缝影响研究对该坝型的设计理论的发展和解决工程实际问题都有着重要意义。本文主要研究的内容及所得的结论如下： 1、本文介绍了面板堆石坝的发展历程、国内外研究现状。研究了混凝土面板堆石坝有限元仿真分析中的非线性基本理论、方法及堆石体的各种本构模型；同时阐述了面板与垫层之间的接触设置理论和面板分缝的薄层单元理论。 2、本文首先利用ANSYS软件进行材料本构E-B模型的二次开发，使之能应用于混凝土面板堆石坝的计算模拟。在软件中运用生死单元、荷载步、荷载子步的联合设置实现了分级加载来模拟堆石坝逐层填筑的施工过程；采用面—面接触单元模拟了面板与垫层的接触。以青海省石头峡面板堆石坝为例，模拟其标准断面在竣工期、一期蓄水和正常蓄水期的应力变形，并以大量图表进行结果分析。结果表明：坝体应力变形满足安全要求，和已建的国内外同类工程的应力变形结果一致。 3、同样以青海省石头峡面板堆石坝为例，对标准断面进行面板水平缝模拟。给出了水平分缝不同宽度、数量时的应力和挠度及其分布规律，探讨较为理想的分缝数量，以减小面板的应力变形，面板所分的缝体采用薄层单元进行模拟。结果表明：面板水平分缝的设置坝体的应力变形无影响；在所设定的不同数量缝体中，随着水平缝体数量越多，最大应力值有减小的趋势，且在水平缝附近的压应力值有明显的减小，但只表现在局部区域，对拉应力值得影响不大；面板的挠度有减小的趋势，但影响甚微，可以忽略不计；在缝体数量相同的前提下，增大面板水平分缝的宽度，有助于减小面板的压应力，但作用不明显，对面板挠度基本无影响。
[Abstract]:Concrete face rockfill dam has become the most rapidly developing type of dam because of its high safety, better economy and wider adaptability. It is of great significance to develop the stress and strain analysis of concrete face rockfill dams and to study the effect of panel joint on the design theory development of the dam type and the practical engineering problems. The main contents and conclusions of the paper are as follows:
1, this paper introduces the development course of the face rockfill dam and the research status at home and abroad. The nonlinear basic theory of the finite element simulation analysis of concrete face rockfill dam is studied, the method and various constitutive models of the rockfill body are studied. At the same time, the contact setting theory between the panel and the cushion and the thin layer element theory of the panel seam are also expounded.
2, this paper first uses the ANSYS software to develop the material constitutive E-B model, which can be applied to the calculation and Simulation of the concrete face rockfill dam. In the software, the combined setting of life and death units, load steps and load sub steps is used to simulate the construction process of the rockfill dam by layered loading, and the surface to face contact element model is used. The contact between the panel and the cushion is proposed. Taking the stone gorge face rockfill dam in Qinghai Province as an example, the stress and deformation of the standard section in the completion period, the first phase of the water storage and the normal storage period are simulated, and the results are analyzed with a large number of charts. The results show that the stress and deformation of the dam meet the safety requirements and the stress and deformation results of the similar projects at home and abroad. Agreement.
3, taking the stone gorge face rockfill dam in Qinghai as an example, the horizontal joint of the standard section is simulated. The stress and deflection of the horizontal seams and the distribution rules of the stress and deflection in the number of the horizontal seams are given. The more ideal seam number is discussed to reduce the stress and deformation of the panel. The seam body divided by the panel is simulated by the thin layer element. It is shown that the stress and deformation of the dam body is not affected by the horizontal joint of the panel; the maximum stress value decreases as the number of the horizontal seams is more, and the stress value near the horizontal seam decreases obviously, but only in the local area. The degree has a decreasing trend, but the influence is very slight, it can be ignored. Under the same number of seams, the width of the horizontal seam is increased, which can help to reduce the pressure stress of the panel, but the effect is not obvious, and there is no effect on the deflection of the panel.
【学位授予单位】：西北农林科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV641.4

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