广州结构性粉质粘土剪胀特性试验研究

›› 2015, Vol. 29 ›› Issue (4): 119-123.

广州结构性粉质粘土剪胀特性试验研究

张沛1，杨雪强1，张新涛2

(1.广东工业大学土木与交通工程学院，广州 510006； 2.中建二局安装工程有限公司，河北廊坊 065000）

收稿日期:2014-06-29 出版日期:2015-08-20 发布日期:2015-11-06
作者简介:张沛（1988-），男，硕士研究生，研究方向为岩土工程。

Experimental Tests of the hear Dilatancy of Guangzhou Structural Silty Clay

ZHANG Pei1, YANG Xueqiang1, ZHANG Xintao2

(1. College of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006;
2. Installation Engineering Co. Ltd., China Construction No. 2 Bureau, Langfang 065000)

Received:2014-06-29 Online:2015-08-20 Published:2015-11-06

摘要/Abstract

摘要： 采用高压固结仪与真三轴试验仪对广州原状粉质粘土分别进行固结压缩试验与固结不排水条件下的真三轴剪切试验，根据试验结果绘制其剪胀d与应力比η的关系曲线，探讨结构性土体的剪胀随中主应力系数bσ与大主应力与沉积方向夹角α的不同而呈现出来的变化趋势。试验结果表明：随着中主应力系数bσ与大主应力与沉积方向夹角α的增大，结构性土体的剪胀趋势越来越弱，且土体达到破坏时的应力比η随夹角α的变化而逐渐减小。说明结构性土体的初始各向异性与诱发各向异性共同影响着其剪胀特性与其强度的发挥。
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关键词: 结构性粉质粘土, 真三轴, 固结不排水剪切, 剪胀, 应力比

Abstract: This paper presents the laboratory test results of the consolidation test using the high pressure consolidation equipment and the consolidated, undrained shear test using true triaxial shear test equipment on the undisturbed Guangzhou silty clay. The relationship between the shear dialatancy, d , and the stress ratio, η , is plotted based on the test results. This paper also discusses the impact of intermediate principal stress ratio, b_σ, and the angle, α between the major principal stress and the direction of sedimentation on the shear dilatancy of the soil mass. The test results indicates that the dilatancu of the soil mass decreases with the increase of the b_σ(intermediate principal stress ratio) and the α (angle between the major principal stress and direction of sedimentation). The structural properties of the soil such as the heterogeneous and factors triggering the heterogeneous properties of soil mass affect the shear dilatancy as well as the shear strength.

Key words: Structural Clay, True Triaxial Testing, Consolidated Undrained Shear Tests, Soil Dilatancy, Stress Ratio

张沛1，杨雪强1，张新涛2. 广州结构性粉质粘土剪胀特性试验研究[J]. , 2015, 29(4): 119-123.

ZHANG Pei1, YANG Xueqiang1, ZHANG Xintao2. Experimental Tests of the hear Dilatancy of Guangzhou Structural Silty Clay[J]. , 2015, 29(4): 119-123.

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