摘要
原状土的结构性对它的力学性质影响显著。通过多应力路径的原状土与重塑土的试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。从等压固结对比试验可看出该原状样明显的结构性与欠固结性。对于原状欠固结土,体应变对土体结构性的破坏要大于剪应变。原状欠固结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土试验结果对比,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 significantly affected by their structure.The special mechanical characteristics of natural soils and the influence of stress path on natural soils are disclosed through the comparison of results of tests on natural soils and manipulated soils with multiple stress paths.The structural and underconsolidation behaviors of natural soils are shown in the normal consolidation experiment.The structure damage of the natural underconsolidated soils caused by the increment of volumetric strain is more significant than that caused by the increment of shearing strain.The influence of the structure on natural soils is mainly embodied as the increase of internal friction angle.At small strain,natural soils are of high stiffness,obvious nonlinearity and are markedly different from the manipulated soils.Through the comparison of test results of natural soil samples cut from different direction,the anisotropy of natural soils which becomes obvious as strain decreases is illustrated.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2004年第z1期4409-4413,共5页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金(50309017)
重庆市科委资助项目。
关键词
土力学
原状土
粘土
结构性
小应变
应力路径
欠固结土
soil mechanics,natural soil,clay,structural behavior,small strain,stress path,underconsolidated soil
作者简介
刘元雪,男,1969年生,1991年毕业于重庆大学采矿工程系,1998年于后勤工程学院获岩土工程博士学位,现为副教授,主要从事岩土本构关系与数值分析方面的教学与研究工作.
