地震力作用下尾矿库坝体的三维稳定性研究

发布时间：2018-03-13 15:16

本文选题：尾矿库　切入点：邓肯-张模型　出处：《石家庄铁道大学》2014年硕士论文　论文类型：学位论文

【摘要】：尾矿库是一种特殊的水工构筑物，是金属矿山建设的重要组成部分。其数量和高度随着国家对矿产资源的巨大需求而快速增加。我国是世界上多地震国家之一，而地震又是造成尾矿库溃坝的主要原因之一。因此，深入研究地震力作用下尾矿库的稳定性显得尤为重要。文中主要进行了以下研究工作： (1)通过对Abaqus二次开发，获得了尾矿库坝体静力稳定分析和动力稳定分析所需要的UMAT用户子程序，即邓肯一张双曲线E-B模型和等效粘弹性模型的用户子程序。将剪应力对比法作为液化判别方法引入到计算模型中对液化区进行分析，并将沈珠江残余变形模型引入计算模型对震后坝体的残余变形进行定量分析。 (2)以河北省某新建尾矿库为例，通过曲面拟合的方法建立与实际地形相接近的三维数值模型。该模型的地形曲面与实际等高线的走向拟合良好，能较准确反映地形特征，为数值计算提供了基础。应用文中所开发的计算程序，对尾矿库坝体数值模型进行静力分析，分析结果表明，尾矿库坝体静力状态稳定，并得到各单元的围压状态，为动力反应提供基础。选取2条实测地震波和1条人工波对坝体进行动力分析，得到了三种地震波作用下坝体的动剪应力和动剪应变。在此基础上对坝体进行液化分析，得到了三种地震波作用下尾矿库坝体液化区在三维空间的分布范围与液化深度，并分析了震后坝体的稳定性；对坝体进行残余变形分析，得到了三种地震作用下尾矿库的残余变形分布规律，并验证了震后的干滩长度和安全超高是否满足规范要求。由以上计算分析可得：三种地震波计算得到的液化区、残余变形分布规律相似。计算结果没有明显的离散性，表明文中开发的程序稳定可行，为类似尾矿库的动力稳定分析提供参考。
[Abstract]:Tailing reservoir is a special hydraulic structure and an important part of metal mine construction. Its quantity and height increase rapidly with the great demand for mineral resources. China is one of the countries with many earthquakes in the world. Earthquake is one of the main causes of tailing dam failure. Therefore, it is very important to study the stability of tailing reservoir under seismic force. 1) through the secondary development of Abaqus, the UMAT user subroutine for static stability analysis and dynamic stability analysis of tailing dam body is obtained. This is the user subroutine of a hyperbolic E-B model and an equivalent viscoelastic model. The shear stress contrast method is introduced into the calculation model to analyze the liquefaction zone. Shen Zhujiang's residual deformation model is introduced into the calculation model to quantitatively analyze the residual deformation of the dam body after the earthquake. Taking a newly built tailing reservoir in Hebei province as an example, a 3D numerical model is established by curved surface fitting method, which is close to the actual terrain. The terrain surface of the model fits well with the actual contour, and it can accurately reflect the topographic features. The results show that the static state of the tailing dam body is stable, and the confining pressure state of each unit is obtained. The dynamic shear stress and shear strain of the dam body under the action of three kinds of seismic waves are obtained, and the liquefaction analysis of the dam body is carried out on the basis of selecting two measured seismic waves and one artificial wave to carry out the dynamic analysis of the dam body, and the dynamic shear stress and the dynamic shear strain of the dam body under the action of three kinds of seismic waves are obtained. The distribution range and liquefaction depth of the liquefaction area of the tailing dam body under the action of three kinds of seismic waves are obtained, and the stability of the dam body after the earthquake is analyzed, and the residual deformation of the dam body is analyzed. The residual deformation distribution law of tailings reservoir under three kinds of earthquakes is obtained, and it is verified that the dry beach length and the safety super-high after the earthquake can meet the requirements of the code. From the above calculation and analysis, it can be concluded that the distribution law of residual deformation is similar to that of the liquefaction zone calculated by three kinds of seismic waves. The result of calculation has no obvious discreteness, which shows that the program developed in this paper is stable and feasible. It provides a reference for dynamic stability analysis of similar tailing ponds.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV649;TV312

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