中国安全科学学报 ›› 2017, Vol. 27 ›› Issue (4): 116-121.doi: 10.16265/j.cnki.issn1003-3033.2017.04.021

• 安全工程技术科学 • 上一篇    下一篇

非饱和尾矿砂抗剪强度参数分布与安全影响

林雪松1 讲师, 陈殿强2 教授级高工, 王来贵3 教授   

  1. 1 辽宁工程技术大学 理学院,辽宁 阜新 123000
    2 辽宁有色勘察研究院,辽宁 沈阳 110013
    3 辽宁工程技术大学 力学与工程学院,辽宁 阜新 123000
  • 收稿日期:2016-12-20 修回日期:2017-02-20 发布日期:2020-11-22
  • 作者简介:林雪松 (1979—),男,满族,辽宁丹东人,博士,讲师,主要从事尾矿坝安全方面的科研和教学工作。E-mail: lxs488@qq.com。
  • 基金资助:
    国家自然科学基金资助(51474121,11202091, 51404136, 51274110);辽宁省教育厅城市研究院项目(LJCL007);国家自然基金煤炭联合基金重点资助项目(U1361211);辽宁省百千万人才项目([2015]33号)。

Distribution of shear strength parameters and safety influence of unsaturated tailings

LIN Xuesong, CHEN Dianqiang, WANG Laigui   

  1. 1 College of Science, Liaoning Technical University, Fuxin Liaoning 123000, China
    2 Liaoning Nonferrous Exploration and Research Institute, Shenyang Liaoning 110013, China
    3 School of Mechanics and Engineering, Liaoning Technical University, Fuxin Liaoning 123000, China
  • Received:2016-12-20 Revised:2017-02-20 Published:2020-11-22

摘要: 为探究非饱和尾矿砂对尾矿库安全状态的影响,首先通过二维非饱和渗流试验和常规直剪试验相结合的方法研究非饱和尾矿砂黏聚力、内摩擦角的空间分布特征;然后利用参数优化方法确定解析模型中的未知参数,并用优化后的模型拟合非饱和渗流试验结果;最后采用数值计算分析非饱和尾矿砂对尾矿坝安全系数的影响。结果表明:非饱和尾矿砂含水率在水平和竖直方向呈指数分布规律;黏聚力随含水率的增加先增后减,内摩擦角随含水率的增加单调递减,抗剪强度参数具有空间分布;引入非饱和尾矿砂后尾矿坝安全系数明显减小,随着非饱和尾矿砂厚度的增加,安全系数缓慢减小。

关键词: 尾矿砂, 非饱和渗流, 含水率, 黏聚力, 内摩擦角, 安全系数

Abstract: To study influence of unsaturated tailings on safety of tailing ponds, two-dimensional unsaturated seepage experiments and direct shear tests were carried out. Spatial distributions of cohesive force and internal friction angle of unsaturated tailings were studied. The method of parameters optimization was used to calculate the unknown parameters of the analytic model and the whole model was used to analyze the results of the unsaturated seepage experiments. The influence of unsaturated tailings on the dam safety factor was analyzed by numerical computation. The results show that distribution of water content of unsaturated tailings is like an exponential function in both horizontal and vertical directions,that the cohesive force increases at first with water content and then decreases, there is a negative correlation between internal friction angle and water content, and spatial distribution characteristics are owned by shear strength parameters,and that there is a negative correlation between the dam safety factor and thickness of the unsaturated tailings layer.

Key words: tailings, unsaturated seepage, water content, cohesive force, internal friction angle, safety factor

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