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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第9卷    第5期    总第49期    2012年10月

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文章编号:1672-7029( 2012) 05-0046-04
直接快剪条件下黏土抗剪强度影响因素探讨
王星华1,黄长溪1,隆威2

(1.中南大学土木工程学院,湖南长沙410083;
2.中南大学地球科学与信息物理学院,湖南长沙410083
)

摘 要: 为了了解孔隙比、含砂率对长沙市岳麓地区黏土抗剪强度的影响,对不同孔隙比和含砂率的12 组土样进行一系列直接快剪试验,得出相关试验结果。并应用最小二乘法对试验数据进行拟合,得出黏聚力、内摩擦角与孔隙比、含砂率2 种因素的相关方程。在试验结果的基础上,对孔隙比、含砂率影响机理进行分析和讨论。研究结果表明: 随着密实度增大,即当孔隙比减小时,黏聚力增强,内摩擦角增大; 随着含砂量增大,黏聚力减小,内摩擦角减小。

 

关键字: 黏土; 抗剪强度; 最小二乘法

Shear strength factors of clayey soils under the condition of direct fast shear
WANG Xing-hua1,HUANG Chang-xi1,LONG Wei2

1.School of Civil Engineering,Central South University,Changsha 410083,China;
2.School of Geosciences and Info-Physics,Central South University,Changsha 410083,China

Abstract:In order to find out the effects of void ratio and sand content on shear strength indexes of the clayey soils in Yuelu district of Changsha,twelve types of samples whose void ratios and sand contents is different with each other were studied by a series of direct fast shear test.The relevant data of test results was obtained.The relevance equation between the cohesion of clayey soils and internal friction angles and void ratio and sand content were presented by means of least squares fitting.On the basis of the above findings,the influence mechanism of void ratio and sand content on the shear strength of studied soils was analyzed and discussed.The results show that the cohesion of clayey soils increases and the corresponding internal friction angles increases with the decrease of void ratio and the increase of density; with the increase of sand content ,the cohesion of clayey soils decreases and the corresponding internal friction angles decreases.

 

Key words: clayey soils; shear strength ; least square method

ISSN 1672-7029
CN 43-1423/U

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