一种原状欠压密土的力学特性实验研究  

Experimental study of mechanical characteristics of an incomplete consolidation silty clay

作　　者：刘元雪[1] 施建勇[2] 伊颖锋[2] 徐龙君 

机构地区：[1]后勤工程学院土木工程系,重庆400041 [2]河海大学岩土工程研究所,江苏南京210098 [3]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

出　　处：《岩土力学》2004年第1期5-9,共5页Rock and Soil Mechanics

基　　金：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;中国博士后科学基金资助。

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。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.

关 键 词：原状土 粘土 结构性 小应变 应力路径 欠压密 力学特性 

分 类 号：TU411.5[建筑科学—岩土工程]