海相沉积粉质中间土的物理状态  

On physical state of natural marine intermediate soils

作　　者：石名磊[1] 刘建华[1] 

机构地区：[1]东南大学交通学院,南京210096

出　　处：《东南大学学报（自然科学版）》2005年第6期935-939,共5页Journal of Southeast University：Natural Science Edition

基　　金：江苏省交通科学基金资助项目(02Y015)

摘　　要：长江河口地区通启高速公路工程地质研究发现,该区域广泛分布海相粉质中间土,其液性指数与一般海相软粘土相似,具有较高的原位强度、较低的塑性和显著的结构性,而其粒度分布、强度特性、压缩性和塑性图与海相软粘土明显不同.采用主成分与主分量分析,对海相粉质中间土的多指标反映其土性信息的能力进行了分析.分析结果表明,采用液性指数划分其稠度的传统方法不尽合理,而采用F孔隙函数确定其物理状态更加合理.根据物理状态指标与工程力学特性的相关性,建立孔隙函数划分中间土物理状态新方法.通启高速公路工程实践表明,海相粉质中间土具有良好的力学特性,不应隶属于软粘土地基.The geotechnical investigation of the case history of Tongqi freeway in the Yangzi River delta has revealed that the natural marine intermediate deposits, which is distributed extensively in the stratigraphy of the site, have almost the same liquidity index as those of the soft natural marine clays, but the former have much higher in-situ strength, very low plasticity and more significant sensitivity than the latter. Additionally, there is significant difference in grain size distributions, strength characteristics, compression behaviour and plasticity chart between the intermediate soils and general clayey soils. So these soils are defined as natural marine intermediate soils to know from that of natural clayey soils. The multi-indexes for physical property of natural marine intermediate soils reflecting its property information is researched by principal component analysis. The classification of the intermediate soils consistency with the liquidity index is not rational, whereas classification with Fioravante pore function is very justified. Based on the correlation of clay physical state index and mechanics character, a new procedure for determining the physical state of the intermediate soils with Fioravante pore function is conducted. The practice in Tongqi highway has shown that natural marine intermediate soils is of good mechanics characteristics generally, so it shouldn＇t be ranged to soft clay ground.

关 键 词：天然沉积海相土 主成分与主分量分析 孔隙函数 液性指数 稠度 

分 类 号：TU432[建筑科学—岩土工程]