细粒尾矿料力学特性及其筑坝静动力分析

发布时间：2018-05-01 09:02

本文选题：细粒尾矿 + 力学性质　；参考：《西安理工大学》2017年硕士论文

【摘要】：随着我国科学技术的发展及机械制造业技术的不断提高,矿山企业的选矿技术也有了突飞猛进的发展,选矿过后的尾矿废渣颗粒也呈现逐渐变细的趋势,而细粒尾矿透水性差,固结速度较慢等特点使得上游式细粒料尾矿坝稳定性及抗震能力相对较弱,溃坝可能性增大。因此,针对细粒尾矿展开的物理力学试验研究是很有必要的。本文以陕西某金矿细粒尾矿料为研究对象,通过一系列室内试验对细粒尾矿料力学特性进行研究,并在此基础上进行尾矿坝的静力、动力响应分析。具体内容如下:首先,对三种不同颗粒组成的细粒尾矿进行压缩试验、渗透试验、静三轴试验、动三轴试验,得到了尾矿料的物理力学特性指标,并整理得到各颗粒组成及干密度下的邓肯-张模型参数及等效粘弹性模型参数,为仿真计算提供必要条件。同时对所获取参数进行对比分析,确定随着细粒尾矿中颗粒成分的变化对其力学特性的影响。其次,针对实际工程中上游式尾矿坝尾矿上部排放与下部固结同时进行的特点,为确定尾矿在沉积过程中某一固结状态下的力学特性,试验研究细粒尾矿在不同固结度、不同干密度下的力学特性,并对比分析由于颗粒成分不同而引起的特性差异。最后,利用试验所得参数,利用EFES3D程序进行尾矿坝的静动力有限元分析,了解细粒尾矿在分级填筑过后及地震动作用下尾矿坝内应力、变形及稳定性情况。
[Abstract]:With the development of science and technology in China and the continuous improvement of machinery manufacturing technology, the mineral processing technology of mining enterprises has also developed by leaps and bounds, and the tailings after dressing have shown a trend of gradually thinning, and the permeability of fine tailings is poor. The stability and seismic capacity of upstream fine-grained tailings dam are relatively weak and the possibility of dam break is increased due to the slow consolidation speed. Therefore, it is necessary to study the physical mechanics of fine tailings. In this paper, the mechanical properties of fine tailings are studied through a series of laboratory tests, and the static and dynamic responses of the tailings dam are analyzed on the basis of a series of laboratory tests. The main contents are as follows: firstly, the physical and mechanical properties of the tailings are obtained by compression test, permeation test, static triaxial test and dynamic triaxial test. The Duncan-Chang model parameters and the equivalent viscoelastic model parameters are obtained under the dry density and particle composition, which provides the necessary conditions for the simulation calculation. At the same time, the parameters obtained are compared and analyzed to determine the effect of the change of particle composition on the mechanical properties of fine tailings. Secondly, in view of the characteristics of upper tailings discharge and lower consolidation of upstream tailings dam in practical engineering, in order to determine the mechanical characteristics of tailings in a certain consolidation state during the sedimentation process, the different consolidation degree of fine tailings is studied experimentally. The mechanical properties of different dry densities were compared and analyzed. Finally, the static and dynamic finite element analysis of the tailings dam is carried out by using the EFES3D program, and the stress, deformation and stability of the tailings dam after the fine tailing is graded and filled and under the action of ground motion are obtained.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV41;TV52

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