一种原状欠压密土的力学特性实验研究

›› 2004, Vol. 25 ›› Issue (1): 5-9.

一种原状欠压密土的力学特性实验研究

刘元雪^{1, 2}，施建勇³，伊颖锋³，徐龙君²

1. 后勤工程学院土木工程系，重庆 400041；2. 重庆大学西南资源开发及环境灾害控制工程教育部重点实验室，重庆 400041； 3. 河海大学岩土工程研究所，江苏南京 210098

收稿日期:2002-09-23 出版日期:2004-01-10 发布日期:2014-07-15
作者简介:刘元雪, 男，1969年出生，博士，副教授。主要从事岩土本构关系与数值分析的教学与研究工作。现为重庆大学西南资源开发及环境灾害控制工程教育部重点实验室访问学者
基金资助:
获国家自然科学基金（NO.50309017），重庆市科委教育部优秀青年教师教学科研奖励计划与中国博士后科学基金资助

Experimental study of mechanical characteristics of an incomplete consolidation silty clay

LIU Yuan-xue^{1, 2}, SHI Jian-yong³, YI Ying-feng³, XU Long-jun²

1. Department of Civil Engineering, Logistical Engineering University, Chongqing 400041, China; 2. Key Lab. for the Exploitation of Southwest Resources & the Environmental Disaster Control Engineering, Ministry of Education, Chongqing University, China；3. Research Institude of Geotechnical Engineering, Hohai University, Nanjing 210098, China

Received:2002-09-23 Online:2004-01-10 Published:2014-07-15

摘要/Abstract

摘要： 原状土的结构性对它的力学性质影响显著。通过对原状土与重塑土多应力路径的实验结果比较，来揭示原状土体从小应变到大应变的特殊力学特性及应力路径的影响。从等压固结对比实验可看出，该原状样明显的结构性与欠压密性。对于原状欠压密土，体应变对土体结构性的破坏要大于剪应变。欠压密原状土的结构性对土体强度的影响主要表现在内摩擦角的增大。土体小应变时表现出明显的高刚度与非线性。通过不同方向切样的原状样实验结果对比，反映了原状土体存在明显的各向异性，结构性引起的各向异性在应变越小时越明显。

关键词: 原状土, 粘土, 结构性, 小应变, 应力路径, 欠压密

Abstract: The mechanical characteristics of natural soils are affected by its structure significantly. The special mechanical behavior of natural soils and the influence of stress path on natural soils are disclosed through the comparison of multiple stress paths experimental results between natural soils and reconstituted soils. The characteristics of structure and incomplete consolidation of natural soils are shown in the normal consolidation experiment. The damage of the structure of the incomplete consolidation natural soils caused by the increment of volumetrical strain is more significant than that of shear strain. The influence of the structure on the strength of natural soils is mainly expressed as the increase of internal friction angle. At small strain, natural soils different from the reconstituted soils markedly, such as high stiffness, obvious nonlinearity. Through the comparison of experimental results of natural soils derived from different directions, the anisotropy of natural soils, which is more obvious as the decrease of strain, is illustrated.

Key words: natural soils, clay, structure, small strain, stress path, incomplete consolidation

中图分类号:

TU 411.5

刘元雪，施建勇，伊颖锋，徐龙君. 一种原状欠压密土的力学特性实验研究[J]. , 2004, 25(1): 5-9.

LIU Yuan-xue, SHI Jian-yong, YI Ying-feng, XU Long-jun. Experimental study of mechanical characteristics of an incomplete consolidation silty clay[J]. , 2004, 25(1): 5-9.

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