土工基础

›› 2016, Vol. 30 ›› Issue (2): 269-273.

• 工程实录 • 上一篇    下一篇

非饱和花岗岩残积土强度试验研究

邓署冬，祝方才，李大建   

  1. （湖南工业大学 土木工程学院，湖南株洲 412007）
  • 收稿日期:2015-08-27 出版日期:2016-04-20 发布日期:2016-04-27
  • 通讯作者: 祝方才（1972-），男，博士，教授，研究方向为洞室和边坡稳定。
  • 作者简介:邓署冬（1990-），男，硕士研究生，研究方向为非饱和土。
  • 基金资助:

    基金项目：湖南省教育厅优秀青年项目资助（10B025）

Experimental Study of the Strength of the Unsaturated Granitic Residual Soils

DENG Shudong. ZHU Fangcai, LI Dajian   

  1. （College of Civil Engineering, Hunan University of Technology, Zhuzhou 412007）
  • Received:2015-08-27 Online:2016-04-20 Published:2016-04-27

摘要： 以衡阳非饱和花岗岩残积土为例，研究非饱和花岗岩残积土强度特性。采用滤纸法测定了花岗岩残积土的土水特征曲线，并进行了固结不排水剪切试验，分析了含水量及初始基质吸力对非饱和花岗岩残积土强度的影响。试验表明，在试验研究的含水量范围内，非饱和花岗岩残积土的吸力随着含水量的增大而减小，但含水量对初始基质吸力的影响较小；内摩擦角随含水量增加而线性减小，黏聚力随含水量增加呈二次曲线规律变化，而初始基质吸力对内摩擦角和黏聚力的影响呈非线性。

关键词: 非饱和残积土, 含水量, 基质吸力, 抗剪强度

Abstract: This paper studies the strength characteristics of the Hengyang unsaturated granitic residual soils. The soil water characteristic curves of the granitic residual soils were determined by the filter paper method and the consolidated undrained shear tests were performed to analyze the influence of the initial matrix suction and the water content on the strength of the soil. The results indicate that, within the range of tested moisture, the suction of the unsaturated granitic residual soil decreases with the increase of the moisture content, but the moisture content is less affected by the initial matrix suction. Correspondingly, the internal friction angle decreases linearly with the increase of the moisture content and the cohesion changes in a quadratic relationship. The change of the initial matrix suction in relation with the internal friction angle and cohesive is nonlinear.

Key words: Unsaturated Residual Soils, Moisture Content, Matric Suction, Shear Strength