土工基础

›› 2018, Vol. 32 ›› Issue (1): 95-98.

• 工程实录 • 上一篇    下一篇

制样方法对宁明膨胀土剪切强度的影响

黄炫彰，陈永健，文松松   

  1. （桂林理工大学土木与建筑工程学院，广西桂林 541004）
  • 收稿日期:2017-03-16 修回日期:2017-02-23 出版日期:2018-02-20 发布日期:2018-03-01
  • 作者简介:黄炫彰（1991-），男，硕士研究生，研究方向为岩土工程。

Effects of Sampling Methods on the Shear Strength of Ningming Expansive Soils

HUANG Xuanzhang, CHEN Yongjian， WEN Songsong   

  1. (College of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004)
  • Received:2017-03-16 Revised:2017-02-23 Online:2018-02-20 Published:2018-03-01

摘要： 以宁明膨胀土为研究对象，利用直剪仪对压实样进行直剪试验，研究了水调盐泡、盐调盐泡以及水调盐淋滤三种制样方法和不同盐溶液浓度对宁明膨胀土抗剪强度的影响。结果表明：孔隙溶液浓度和制样方法对剪切强度都有的一定影响，三种制样方法得到的试验结果表明随着NaCl溶液浓度的上升，土颗粒之间的黏聚力和摩擦角也会变小，宁明膨胀土的抗剪强度随之下降，且不同的制样方法黏聚力下降的程度也不相同，通过水调盐淋滤法制得的试样受溶液浓度影响较其他两种方法更明显。

关键词: 压实样, 成样方法, 直剪试验

Abstract: The effect of sample preparation methods on the shear strength of Ningming expansive soils is investigated by using direct shear tests. Three different sample preparation methods were explored: fresh water prepared submerged in salt water; salt water prepared sample submerged in salt water and fresh water prepared sample leached by salt water. The effect of different concentration of the salt water are also investigated. The results indicate that, the concentration of fluid in the soil as well as the sample preparation methods have effects on the shear strength. With the increase of the salt concentration, the cohesion as well as internal friction angle decrease in samples prepared by all three different methods. The shear strength values are different in samples prepared with different methods. Sample prepared by the salt water leaching has the largest influence on the shear strength.

Key words: compacted samples, sample preparation methods, direct shear tests