土工基础

›› 2016, Vol. 30 ›› Issue (6): 721-725.

• 工程实录 • 上一篇    下一篇

不同细粒含量下粗砂的强度特性试验研究

李 君，杨雪强   

  1. （广东工业大学土木与交通工程学院，广州 510006）
  • 收稿日期:2016-01-08 修回日期:2016-01-20 出版日期:2016-12-20 发布日期:2016-12-22
  • 作者简介:李 君（1989-），男，硕士研究生，研究方向为砂土的力学特性及本构关系。

The Strength Properties of the Coarse Sand with Various Fine Sand Contents

LI Jun, YANG Xueqiang   

  1. (Guangdong University of Technology, Guangzhou 510006)
  • Received:2016-01-08 Revised:2016-01-20 Online:2016-12-20 Published:2016-12-22

摘要： 细粒含量能对砂土抗剪强度带来不同程度影响。通过对福建标准砂的细粒及粗粒通过不同比例混合成试样，分别进行100 kPa、300 kPa有效固结压力下的固结不排水常规三轴剪切试验。研究结果表明，在低围压和高围压下，剪切初期各试样的抗剪强度差异不大，发生应变硬化后，纯粗砂和纯细砂都具有很高的强度，但当饱和粗砂混有细砂时，由于细颗粒处于砂颗粒组成的骨架孔隙中起到近似于“滚珠”的作用，使得饱和粗砂的抗剪强度因细颗粒的增加引起了不同程度的降低。

关键词: 细粒含量, 砂土, 真三轴, 剪切试验

Abstract: Fine content is one of the main factors that affect the shear strength of the sand. A series of true triaxial shear tests of the fine sand mixed with various amounts coarse sand are conducted. Both the fine sand and coarse sand are selected form the Fujian standard sand. The sand mixtures are consolidated and drained tested confining pressures of 100kPa and 300kPa, respectively. The results show that the shear strength of the samples at the initial stage of shear is not quite different under both the low confining pressures and the high confining pressures. After a strain hardening process, both pure coarse sand and pure fine sand demonstrate a very high strength. But when the samples are the mixtures of coarse and fine sands, the fine particles at the edge of the coarse sand skeleton serve as a role of roller. The shear strength of coarsefine sand mixtures reduces with the increase amount of fine sand content.

Key words: Fine Contents, Sandy Soils, True Triaxial Shear Device, Shear Test