土工基础

›› 2018, Vol. 32 ›› Issue (1): 64-68.

• 工程实录 • 上一篇    下一篇

NaCl溶液对高岭土收缩特性的影响

何锦堂1，颜荣涛1，牛 庚1，张 敏1，于明波2   

  1. (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；2.建材桂林地质工程勘察院，广西桂林 541004)
  • 收稿日期:2017-04-07 修回日期:2017-05-02 出版日期:2018-02-20 发布日期:2018-03-01
  • 作者简介:何锦堂（1992-），男，硕士，研究方向为环境岩土工程。
  • 基金资助:

    国家自然科学基金（NO.51309055，NO.11372078)；广西自然科学基金（NO.2014GXSFBA118236）

Effect of NaCl Solution on Shrinkage Properties of Kaolin Soil

HE Jintang1， YAN Rongtao1， NIU Geng1， ZHANG Min1， YU Mingbo2   

  1. (1.Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering,Guilin University of Technology,Guilin 541004;
    2.Guilin Geological Engineering Investigation Institute, Guilin 541004)
  • Received:2017-04-07 Revised:2017-05-02 Online:2018-02-20 Published:2018-03-01

摘要： 为了探究孔隙盐溶液对高岭土收缩特性的影响，对6组试样分别用不同浓度的NaCl溶液饱和，进行室内收缩实验，获得了试样的收缩曲线。随着水分的散失，试样的含水率减小，孔隙盐溶液的浓度会增大。利用TableCurve 3D软件作出含水率、浓度和孔隙比的三维关系图像，并进行拟合得到三变量函数。根据该函数，可以得出不同孔隙盐溶液浓度下试样的孔隙比随含水率的变化规律，及试样的收缩特性。试验结果分析表明：随着NaCl溶液浓度的增大，试样的体积收缩增大，收缩能力增强；试样的收缩系数、轴向应变、径向应变和体积应变等收缩指标均随着盐溶液浓度的增大而增大，但是NaCl溶液浓度对高岭土的缩限影响很小。

关键词: 收缩试验, NaCl溶液, 高岭土, 缩限

Abstract: The effect of the solution concentration on the shrinkage properties of the Kaolin soils are investigated in this paper. The shrinkage limit of a total of six (6) series of samples saturated with NaCl solution of various concentrations were laboratory tested for the shrinkage curves. The salt concentrations in the soil pores would increase with the decrease of the moisture contents. The threedimensional graphs among the moisture content, solution concentration in soil and void ration were plotted by the TableCurve 3D software. A function with three variables were statistically developed through the curve fitting. By using his function, the relationship between the void ratio and the moisture content under different salt concentrations were obtained and the sample shrinkage characteristics are able to be analyzed. The results indicate that, with the increase of the salt concentration in the soil, the shrinkage range increases. The coefficient of the shrinkage, axial, radial and volume strains are also increasing with the increase of the salt concentrations. However, the effect of salt concentration on the Kaolin soil is limited.

Key words: shrinkage tests;NaCl solutions, kaolin soils, shrinkage limit