东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2016, Vol. 37 ›› Issue (8): 1166-1171.DOI: 10.12068/j.issn.1005-3026.2016.08.021

• 资源与土木工程 • 上一篇    下一篇

尾矿粉土液化后的大变形特性试验研究

杜艳强1， 杨春和1,2， 张超2， 巫尚蔚1   

  1. (1. 重庆大学 资源及环境科学学院， 重庆400044； 2. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室， 湖北 武汉430071)
  • 收稿日期:2015-07-31 修回日期:2015-07-31 出版日期:2016-08-15 发布日期:2016-08-12
  • 通讯作者: 杜艳强
  • 作者简介:杜艳强(1988-)，男，河南渑池人，重庆大学博士研究生； 杨春和(1962-)，男，江西丰城人，重庆大学教授，博士生导师.
  • 基金资助:
    国家自然科学基金重点资助项目(51234004)； 国家自然科学基金资助项目(41272391).

Experimental Study on Large Post-Liquefaction Deformation Behavior of Tailings Silt

DU Yan-qiang1， YANG Chun-he1,2， ZHANG Chao2， WU Shang-wei1   

  1. 1. College of Resources and Environmental Science， Chongqing University， Chongqing 400044， China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering， Institute of Rock and Soil Mechanics， Chinese Academy of Sciences， Wuhan 430071，China.
  • Received:2015-07-31 Revised:2015-07-31 Online:2016-08-15 Published:2016-08-12
  • Contact: DU Yan-qiang
  • About author:-
  • Supported by:
    -

RichHTML

0

PDF (PC)

772

摘要： 利用GDS动三轴试验系统研究尾矿粉土液化后的变形特性.首先对饱和尾矿粉土进行振动使其液化，再施加静力荷载；分析了固结围压、相对密度、加载速率等因素对变形与孔隙水压力的影响，研究了饱和尾矿粉土液化后的流动变形与孔隙水消散的变化规律.结果表明:不排水试验条件下，固结围压、相对密度对尾矿粉土液化后的流动变形特性影响明显，而加载速率的影响较小；加载试验的最终孔压比一般介于0.7~0.9之间，相对密度对孔压消散过程的影响大于围压的影响.根据试验结果提出了描述尾矿粉土液化后变形特性的三参数模型，并进行了模型参数的拟合计算及模型验证和对比，结果表明该模型具有良好的适用性.

关键词: 尾矿粉土, 孔隙水压力, 液化, 变形, 本构模型

Abstract: The GDS dynamic triaxial testing system was used to study the reloading feature of liquefied tailings silt. First， the saturated tailings silt was liquefied by cyclic loadings， then， the static loadings were applied to the liquefied tailings silt. The deformation and pore water pressure of the liquefied tailings silt were experimentally studied， with confining pressure， relative density and loading rate considered. The results show that， the confining pressure and relative density impact on the deformation of liquefied tailings silt obviously， while the loading rate has little effect， under undrainage condition. Pore water pressure ratio is usually between 0.7~0.9 at the end of the experiment. Relative density has greater impact on the pore water pressure than confining pressure. Based on the experimental data， a new three-parameter constitutive model of liquefied tailings silt is presented and the model parameters are determined by fitting. It is validated that the model proposed has good applicability and forecast precision.

Key words: tailings silt, pore water pressure, liquefaction, deformation, constitutive model

中图分类号: