【作者】 黄伟；

【导师】 邓红卫； 张岳安；

【作者基本信息】 中南大学 ， 安全科学与工程， 2014， 硕士

【摘要】 摘要：矿产资源是人类生存和社会发展的重要物质基础之一。矿石开采产生了大量尾矿,由于选矿技术和尾矿综合利用技术的限制,尾矿的大部分还是以尾矿库的形式是储存。尾矿库的作为一个相对高势能体,具有较大的安全隐患,保持坝体的稳定性是尾矿库安全运行的关键,一旦出现尾矿溃坝,会严重威胁人民的生命财产安全。近年来,随着开采力度的加大,尾矿库的安全稳定性问题愈显突出,同时,土地资源也日趋宝贵,在原有基础上对尾矿库安全有效地加高扩容也具有重要的现实意义。本文以吴坑里尾矿库为依托,对尾矿库展开现场调研,收集尾矿库基础资料和测定各土层力学参数得出其统计分布规律,对坝体现状和加高扩容后展开了渗流和稳定性分析,展开的主要工作如下：(1)基于极限平衡法的可靠度理论对吴坑里尾矿库现状的进行了稳定性分析,得出安全系数和失效概率,提出必要的安全措施,并对治理后的尾矿库进行了稳定性复核。(2)对尾矿库现状和加高扩容后各土层的力学参数分别进行了敏感性分析,得出对坝体安全系数影响最大的力学参数因子。(3)对加高扩容过后的尾矿库分别进行了二维和三维渗流分析,从总水头、孔隙水压、水力梯度、渗流速度、流线等方面反映坝体在正常运行和洪水运行下的渗流特征。(4)以渗流分析为基础,对加高扩容过后尾矿库分别利用极限平衡法和有限元折减强度法进行稳定性分析,得出安全系数,通过分析三维坝体内的应力场和位移场得出坝体受力变形特征。更多还原

【Abstract】 Abstract:Mineral resources is one of the important material basis for human survival and social development, While, mining produced a large number of tailing. Because of the limit in technology of mineral processing and tailing comprehensive utilization, most of tailings are stored in tailing dam. As a relatively high potential energy, tailings dam is a potential safe risk, Maintaining the stability of dam is the key to its safe operation, for it will be a disaster for people’s life and property safety, if tailings dams collapse. Recently, with the increase of mining strength, safety problems of tailings dams are highlighted, at the same time, it is practical significant to elevate and expand tailings dam safety and effectively for saving land.Basing on Wukengli tailings, using on-site research, collecting basic data and measuring soil characters, analyzing the statistical distribution of soil mechanical parameters A study of seepage and stability on both current and elevated tailing dam was carried out in this paper. the main work is as follows.(1) According to reliability theory with limit equilibrium method, The stability on Wukengli tailings dam in current situation was studied, the safety coefficient and failure probability was gotten as results, some necessary security measures were advised, and the stability of the tailings after treatment was tested.(2) Soil mechanics parameter sensitivity analysis on both current and elevated dam was carried out, The mechanical parameters influencing on safety coefficient most was obtained.(3) Tailings dam after elevation and expansion was analyzed by two and three dimensional seepage respectively, seepage characteristics in dam in normal operation and flood operation are illustrated by the total head, pore water pressure, hydraulic gradient, the seepage velocity, flow line and so on.(4) Adopting the saturation line in the seepage analysis, basing on limit equilibrium method and the strength reduction FEM, stability analysis for the tailings after elevation and expansion is carried out. Thus, the safety coefficient and the force deformation characteristics of the dam was obtained, and three dimensional stress field and displacement field in tailing dam was showed.更多还原