土工基础

›› 2017, Vol. 31 ›› Issue (4): 516-520.

• 工程实录 • 上一篇    下一篇

花岗岩残积土抗剪强度参数影响试验研究

唐炜业1，简文彬2   

  1. (1.福州大学环境与资源学院，福州 350116; 2.福州大学资源与城乡建设系，福州 350116)
  • 收稿日期:2016-08-22 修回日期:2016-09-05 出版日期:2017-08-20 发布日期:2017-08-22
  • 作者简介:唐炜业（1991-），男，硕士研究生，研究方向为边坡工程与地质灾害防治。

Factors Affecting the Shear Strength of Granite Residual Soils

TANG Weiye1， JIAN Wenbin2   

  1. (1.College of Environment and Resource, Fuzhou University, Fuzhou 350116；
    2.Department of Resource and UrbanRural Development, Fuzhou University,Fuzhou 350116)
  • Received:2016-08-22 Revised:2016-09-05 Online:2017-08-20 Published:2017-08-22

摘要： 以福州软件园的花岗岩残积土为研究对象，通过SDJ-I型三速电动等应变直剪仪器展开直剪试验。研究当试样的含水条件和干密度条件改变时，花岗岩残积土的抗剪强度参数变化规律。由试验结果可知：当干密度维持恒定，而含水率相对偏小时，黏聚力、内摩擦角和含水率之间呈正相关关系。当含水率超过某一临界值时，二者之间的关系变为负相关关系，该临界值和最优含水率的差异很小。在含水率保持不变的情况下，黏聚力、内摩擦角和干密度之间呈正相关关系，符合线性变化趋势。试验所得的成果对福州地区的设计与勘察工作具有实用价值。

关键词: 含水率, 干密度, 抗剪强度

Abstract: A serious of direct shear tests on granitic residual soil samples from Fuzhou Software Park Project with SDJI direct test device. This device is electrically powered and strain controlled and has three different shearing speed. The objective of this study was to establish the relationship among the shear strength and the various dry densities as well as different moisture contents. The test results indicate that, under the same dry density, the cohesion and internal friction angle are proportional to the moisture content when the moisture content is low. When the moisture content exceeds a threshold value, the shear strength parameters are inversely proportional to the moisture content. The threshold moisture content is close to the optimum moisture content in the Proctor Test. Under the same moisture content, the shear strength parameters are linearly proportional to the dry density.

Key words: Moisture Contents, Dry Density, Shear Strength