摘要
砂纹淤泥质土是夹有微薄层粉细砂层的洞庭湖特有的湖相沉积软土,具有淤泥质土中夹1~2 mm厚微薄砂层的独特构造。为探明其矿物组成和工程性质,通过采用微区X射线衍射试验、固结不排水三轴剪切强度试验、慢速固结试验等开展了研究工作。结果表明砂纹淤泥质土具有颗粒组成以粉粒为主、矿物成分以石英为主的矿物组成和强度指标较一般软土偏高,水平向渗透系数显著大于垂直向渗透系数,各向异性比达到10倍以上,湿密度低、含水率高、孔隙比大、液限和塑限低、塑性指数和液性指数高的工程特征。
The sandy grain muddy soil is a special structured lacustrine deposited muddy soil with sandy laminae from Dongting Lake.The thickness of laminae is less than 1~2 mm.The mineral composition and engineering characteristics were experimental by using X ray diffraction test、Slow consolidation test and consolidation non-drainage triaxial shear test.The results show that the sandy grain muddy soil is primarily composed of quartz,and its particle size belongs to the range of silt.The shear strength of the sandy grain muddy soil is better than general soft soil.Its horizontal permeability coefficient is significantly larger than the vertical permeability coefficient,and the anisotropy ratio is more than 10 times.The results also show that it is characteristic by low wet density,high natural water content,large hole ratio,low liquid limit and plastic limit,high plasticity index and Liquid index.
作者
肖燕
XIAO Yan(Hunan Provincial Communications Planning,Suevey&Design Institute Co.,Ltd.,Changsha,Hunan 410219,China)
出处
《公路工程》
北大核心
2020年第6期222-226,共5页
Highway Engineering
基金
交通运输部企业技术创新项目(2015315798060)
湖南省交通科技项目(201553201104)。
关键词
软土
洞庭湖
土力学
淤泥质土夹微薄层粉砂
砂纹淤泥质土
soft soil
dongting lake
soil mechanics
muddy soil with sandy laminae
the sandy grain muddy soil
