土样制备对自由膨胀率的影响及其改进方法

›› 2006, Vol. 27 ›› Issue (8): 1327-1330.

土样制备对自由膨胀率的影响及其改进方法

陈善雄^{1, 2}，余颂¹，柳治国³，余飞¹，许锡昌¹

1. 中国科学院武汉岩土力学研究所，武汉 430071；2. 华中科技大学土木工程与力学学院，武汉 430074； 3. 贵州省交通规划勘察设计研究院，贵阳 550001

收稿日期:2005-09-13 出版日期:2006-08-10 发布日期:2013-11-26
作者简介:陈善雄，男，1965年生，博士研究生，研究员，主要从事非饱和土土力学和地基处理的理论与工程应用研究工作。

Effect of soil sample preparation on free swelling ratio and its improved measures

CHEN Shan-xiong^{1, 2}, YU Song¹, LIU Zhi-guo³, YU Fei¹, XU Xi-chang¹

1. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. College of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China; 3. Guizhou Communication Planning, Investigation and Propecting Design Institute, Guiygang 550001, China

Received:2005-09-13 Online:2006-08-10 Published:2013-11-26

摘要/Abstract

摘要： 着重论述了土样制备对自由膨胀率试验成果的影响。试验研究发现，3种口径（4.5，5，5.5 mm）和3种下落高度(5，10，15 mm)对取土质量和试验结果影响不大，但颗粒粉碎程度的影响非常明显。规程中土颗粒过0.5 mm筛的规定不够完善，在此粒径范围内3种粒组（0.25～0.5，0.1～0.25，<0.1 mm）的土样，其自由膨胀率结果存在差异。其中，前两者差别不大，<0.1 mm粒组土样的试验结果一般较前两者低30 %～45 %，与膨胀土其他属性指标不匹配。研究结果表明：不同粒径土样在10 mL量土杯中质量相差多达2 g，取土质量是影响自由膨胀率结果的主要因素之一，颗粒结构变化也有可能是影响因素之一，建议土样粒径范围为0.1～0.5 mm。

关键词: 自由膨胀率, 取土质量, 粉碎程度, 粒径, 规程

Abstract: Free swelling ratio is a significant index for classification of expansive soil and identification of swelling potential. Unfortunately it is influenced by many factors, among which the effect of soil sample preparation is discussed. Test researches show that soil sampling mass and test results is of little influence by three funnel bores(4.5, 5, 5.5 mm) and three drop heights (5, 10, 15 mm) while they are much influenced by degree of grinding of soil. The specified standard that soil particle size is less than 0.5 mm is not perfect and the results of free swelling ratio for three soil particle sizes(0.25－0.5, 0.1－0.25, <0.1 mm) is widely variable, it is discovered that the finest soil(<0.1 mm) is reduced by 30 %－45 % and isn’t consistent with other indexes for expansive soil classification. The contrast is studied and mass difference of particle up to 2 g measured by a cup of 10ml is found; the conclusion that the results is influenced by particle mass is established and the changing of structure is a possible reason. At last the particle size between 0.1 mm and 0.5 mm is suggested.

Key words: free swelling ratio, soil sampling mass, degree of grinding, particle size, standard

中图分类号:

TU 411

陈善雄，余颂，柳治国，余飞，许锡昌，. 土样制备对自由膨胀率的影响及其改进方法[J]. , 2006, 27(8): 1327-1330.

CHEN Shan-xiong , YU Song , LIU Zhi-guo , YU Fei , XU Xi-chang，. Effect of soil sample preparation on free swelling ratio and its improved measures[J]. , 2006, 27(8): 1327-1330.

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