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 (4): 583-588.DOI: 10.12068/j.issn.1005-3026.2016.04.027

• 资源与土木工程 • 上一篇    下一篇

循环荷载下尾矿粉土的孔隙水压力特性

杜艳强， 杨春和， 巫尚蔚   

  1. (重庆大学 煤矿动力灾害与控制国家重点实验室， 重庆 400044)
  • 收稿日期:2015-04-28 修回日期:2015-04-28 出版日期:2016-04-15 发布日期:2016-04-05
  • 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).

Pore-Water Pressure Characteristics of Tailings Silt Under Cyclic Loading

DU Yan-qiang， YANG Chun-he， WU Shang-wei   

  1. State Key Laboratory of Coal Mine Disaster Dynamics and Control， Chongqing University， Chongqing 400044， China.
  • Received:2015-04-28 Revised:2015-04-28 Online:2016-04-15 Published:2016-04-05
  • Contact: YANG Chun-he
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摘要： 为了解尾矿粉土在振动作用下的孔隙水压力特性，采用GDS动三轴试验系统对尾矿粉土进行了循环荷载试验，通过施加循环应力使尾矿粉土达到完全液化状态，研究了相对密度及固结围压对尾矿粉土孔隙水压力特性的影响.研究结果表明，尾矿粉土的孔压增长过程可分为4个阶段:孔压快速增长阶段、孔压稳定增长阶段、结构破坏阶段及完全液化阶段；相对密度及围压的增加可以提高其抗液化能力.对比尾矿粉土及砂土试验结果发现:循环荷载作用下尾矿粉土的孔隙水压力特性与砂土不同，其孔压增长规律可用一个双S型模型描述，该模型对粉土和砂土均具有较好的适用性.

关键词: 尾矿粉土, 孔隙水压力, 模型, 循环荷载, 动三轴试验

Abstract: A GDS dynamic triaxial testing system was used for cyclic loading test to study pore-water pressure behaviors in tailings silt. Cyclic stress was applied to liquefy the tailings silt. The influences of relative density and confining pressure on pore-water pressure in tailings silt were studied. The results showed that the development of pore-water pressure can be divided into four stages， namely rapidly growing stage， stabilized-increasing stage， structural failure stage and fully liquefied stage. The increase of confining pressure and relative density can strengthen the capacity of anti-liquefaction. The result of lab tests on tailings silt was compared with that on sand， it showed that the characteristic of dynamic pore-water pressure for tailings silt is different from that of sand， and it can be described with a double-S model which has a very good application in both tailings silt and sand.

Key words: tailings silt, pore-water pressure, model, cyclic loading, dynamic triaxial test

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