尾矿坝坝体的三轴试验及其稳定性数值分析  

Triaxial Test of the Tailings Dam Soil and Numerical Stability Analysis of the Dam

作　　者：高皋[1,2] 袁建议 薛海阳[1,2] 周逸 

机构地区：[1]三峡大学土木与建筑工程学院,湖北宜昌443000 [2]湖北理工学院土木建筑工程学院,湖北黄石435003

出　　处：《湖北理工学院学报》2018年第1期48-52,共5页Journal of Hubei Polytechnic University

基　　金：湖北理工学院优秀青年科技创新团队项目(项目编号:13xtz03);湖北理工学院校级科研重点项目(项目编号:14xjz01A)

摘　　要：为了精确判断黄石市某尾矿坝坝体的强度、刚度及稳定性,采用室内试验与数值模拟相结合的方法对其进行强度和稳定性分析。以摩尔-库仑强度准则为强度条件,通过高压三轴试验分析不同深度的坝体的强度指标关系,运用FLAC3D数值模拟软件,分别计算了在重力荷载作用下和尾矿砂荷载作用下坝体的应力云图、位移云图及塑性区云图。结果表明,随深度增加,尾矿坝坝体的内摩擦角逐步减小,粘聚力逐步增大,应力-应变曲线呈应变软化现象,破坏形态呈鼓形,未能形成明显破裂面。坝体的最大应力出现在底部,幅值为328.84 k Pa;最大水平位移出现在坝体顶部,其值为3.25cm;塑性区云图显示塑性区出现在坝顶,目前该位置仍处于稳定状态,若荷载进一步增加则坝体的拉裂破坏优先从坝体顶部开始。In order to analyze the strength,stiffness and stability of the tailings dam in Huangshi,the methods of indoor test and numerical simulation computation were applied. Taking the Mohr-Coulomb Strength Criterion as the strength condition,triaxial test under high pressure was used to analyze the strength index relationships of soil samples under different depth. Based on the geological report and the date of laboratory test,the FLAC3 D numerical simulation software was applied to calculate the stress,displacement and plastic zone nephogram of tailings dams under different conditions of gravity load and tailing sands load. The results show that the internal friction angle decreases and cohesion increases with the increase of soil depth. The strain-softening phenomenon is observed in the tests through stress-strain curves of soil samples and obvious fracture plane has not yet been reached. The max stress value is 328. 84 k Pa which appears on the bottom of the dam,and max horizontal displacement value is 3. 25 cm which appears on the top. The plastic zone nephogram reveals that the tailing dam is still in steady state,and the tensile broken of dam will preferentially appear on the top with further enlargement of load.

关 键 词：尾矿坝坝体 三轴试验 摩尔-库仑准则 稳定性 数值模拟 

分 类 号：U418.3[交通运输工程—道路与铁道工程]