地震作用下某尾矿库动力反应分析

发布时间：2017-12-31 22:13

本文关键词：地震作用下某尾矿库动力反应分析　出处：《石家庄铁道大学》2016年硕士论文　论文类型：学位论文

【摘要】：我国是一个地震较多的国家,地震造成尾矿库的破坏是灾难性的。由于地震反应的复杂性和尾矿坝材料的非线性,使得地震作用下尾矿坝边坡稳定性分析成为当前的一大难点,在尾矿坝的动力反应分析中,尾矿坝的动力稳定、液化和残余变形等地震响应是人们关心的首要问题。本文开发出动力作用下搜索和计算尾矿坝最危险滑裂面的子程序,以河北省某尾矿库为计算模型,采用ABAQUS软件对其进行非线性静力分析和动力分析。传统的分析方法评价边坡稳定性是以某一瞬时的最小安全系数作为指标,其合理性欠佳,本文提出以安全系数在时间长度上的平均值作为评价指标,基于此指标提出三种不同的时程分析方法来评价动力作用下尾矿坝边坡稳定性,对动力作用下计算尾矿坝边坡的稳定性做出了一些有益的探索,主要研究内容如下:(1)基于有限元极限平衡法和最优化原理,采用Fortran语言,编制地震作用下搜索和计算最危险滑裂面的子程序,该方法吸收了有限元和最优化原理的优点,使得程序高效准确的计算出地震过程中各个时刻最危险滑裂面的大小及其位置。(2)选取河北省某尾矿库为计算模型,利用ABAQUS软件建模并对其进行非线性静力计算和动力计算,得到尾矿坝主剖面的应力云图、静应力水平分布图和坝顶水平向加速度反应时程曲线,输出静应力和动应力文件,为后续程序调用做准备。(3)基于地震动力时程反应分析方法提出固定滑弧时程分析法、动力时程分析法、动力时均分析法,三种尾矿坝边坡稳定分析方法。三种方法分别用时均安全系数曲线和动安全系数时程曲线分析尾矿坝的动力稳定性,更加合理的考虑了地震作用的时间性。
[Abstract]:China is a country with many earthquakes. The damage of tailing reservoir caused by earthquake is disastrous. Because of the complexity of seismic response and the nonlinearity of tailings dam materials. It is difficult to analyze the slope stability of tailings dam under earthquake. In the dynamic response analysis of tailings dam, the dynamic stability of tailings dam is very important. Seismic responses such as liquefaction and residual deformation are of primary concern. In this paper, a subroutine for searching and calculating the most dangerous slip surface of tailings dam under dynamic action is developed, and a tailing reservoir in Hebei Province is used as the calculation model. The nonlinear static analysis and dynamic analysis are carried out by using ABAQUS software. The traditional analysis method is based on the minimum safety factor of a certain moment, and its rationality is not good. In this paper, the average value of safety factor in time length is taken as the evaluation index. Based on this index, three different time-history analysis methods are proposed to evaluate the stability of tailings dam slope under dynamic action. This paper makes some useful exploration to calculate the stability of tailings dam slope under dynamic action. The main research contents are as follows: 1) based on finite element limit equilibrium method and optimization principle, Fortran language is adopted. A subroutine for searching and calculating the most dangerous slip surface under seismic action is developed. The method absorbs the advantages of finite element method and optimization principle. Make the program efficiently and accurately calculate the size and location of the most dangerous slip surface at each time during the earthquake) select a tailing reservoir in Hebei Province as the calculation model. Using ABAQUS software to model and carry out nonlinear static calculation and dynamic calculation, the stress cloud map, static stress horizontal distribution map and horizontal acceleration response time history curve of the tailings dam are obtained. The static stress and dynamic stress file are outputted to prepare for the subsequent program call. (3) based on the seismic dynamic time-history analysis method, the fixed-slip arc time-history analysis method, the dynamic time-history analysis method and the dynamic time-averaged analysis method are proposed. The time-averaged safety coefficient curve and the dynamic safety coefficient time-history curve are used to analyze the dynamic stability of the tailings dam.
【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】：2016
【分类号】：P315.9;TD926.4

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