土工基础

›› 2018, Vol. 32 ›› Issue (2): 205-209.

• 工程实录 • 上一篇    下一篇

粘粒含量对饱和砂土动孔隙水压力的影响

陈永健   

  1. （桂林理工大学 广西岩土力学与工程重点实验室，广西桂林 541004）
  • 收稿日期:2017-03-16 修回日期:2017-04-13 出版日期:2018-04-30 发布日期:2018-05-09
  • 作者简介:陈永健（1990-），男，硕士研究生，研究方向为土动力学工程。
  • 基金资助:

    国家自然科学基金（NO. 41272358)  项目名称：饱和混合土的动力特性及其结构效应

Effect of the Clay Particles on the Dynamic Pore Pressure of a Saturated Sand

CHEN  Yong-Jian   

  1. (Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin University of Technology, Guilin 541004)
  • Received:2017-03-16 Revised:2017-04-13 Online:2018-04-30 Published:2018-05-09

摘要： 用双向电磁振动三轴试验仪进行了动三轴试验，研究了粘粒含量为0%、10%、20%、30%、40%、50%的饱和砂土动孔压的变化规律。按轴向应变εf＝5%为破坏标准，当土体达到破坏后，取每个振次对应的峰值孔压up。研究表明：在粘粒不超过20%时，饱和砂土的孔压up增长速率随着粘粒含量的增加而增加。粘粒超过20%后，饱和砂土的孔压up开始抑制，粘粒大于40%时孔压up得到完全抑制，破坏后的峰值动孔压值基本不变。应用现有的孔隙水压力发展模型对本次试验结果的数据进行了拟合，并对参数进行分析。

关键词: 粘粒含量, 漓江粉细砂, 均等固结, 孔隙水压力

Abstract: The effect of clay contents on the dynamic pore pressure in the saturated sands were studied with dynamic triaxial tests. Samples with clay contents of 0%, 10%, 20%, 30%, 40% and 50% were prepared for the tests. The failure criterion of the triaxial tested samples was set to have an axial strain of 5%. After the sample was failed, the peak pore pressure values that correspondent to each cycle were recorded. The results indicate that, when the clay content is less than 20%, the ratio of peak pore pressure increase in the saturated sand increases with the clay contents. Therefore, the clay content helps the peak pore pressure increase. When the clay content is more than 20%, the peak pore pressure increase ratio is reduced by the increase of clay content. When the clay content is greater than 40%, the increase of pore water pressure is completely blocked by the clay content, an approximately constant peak pore pressure was observed after the failure. The regression analyses were also performed on the curve fitting of the current parameters.

Key words: Clay Particle Content, Silty Fine Sand from Li-Jiang River, Isotropic Consolidation, Pore Water Pressure