黄土结构及物性指标对自重湿陷影响分析与预测  

Analysis and Prediction on Influence of Structure Characteristics and Physical Indexes of Loess on Self-weight Collapsibility

作　　者：姚宸 魏永梁 王小军[3] 安志强 YAO Chen;WEI Yongliang;WANG Xiaojun;AN Zhiqiang(Ningbo Rail Transit Group Co.,Ltd.,Ningbo 315000,Zhejiang,China;China Railway Academy Chengdu Co.,Ltd.,Chengdu 610036,China;Ningbotech University,Ningbo 315100,Zhejiang,China;Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]宁波市轨道交通集团有限公司,浙江宁波315000 [2]中铁科学研究院有限公司成都分公司,成都610036 [3]浙大宁波理工学院,浙江宁波315100 [4]重庆交通大学,重庆400074

出　　处：《路基工程》2021年第6期48-54,共7页Subgrade Engineering

基　　金：科技部科研院所技术开发研究专项资金项目(2005K001-C-1);浙大宁波理工学院科研项目(NBLGXNXM0471)。

摘　　要：以自重湿陷性黄土场地室内外试验数据为基础,研究了黄土的微结构、地层结构、压缩模量与自重湿陷性的关系。结果表明:自西向东,由单粒、架空孔隙和点接触的微结构,逐步向由凝块状或集粒、粒间孔隙、面接触的微结构过渡;黄土地层基本呈水平层状结构,但分层数及厚度、湿陷性差异明显;压缩模量与自重湿陷量的变化规律相反。对黄土自重湿陷系数影响最大的是孔隙比,其次是干密度、含水率;所建立的自重湿陷系数与4个物性指标间的关系式,可预测分析黄土的自重湿陷系数;提出的预测和评价黄土自重湿陷量的公式是可行性。Based on the indoor and outdoor test data of self-weight collapsible loess site,the relationship between the microstructure,stratum structure and compression modulus of loess and the self-weight collapsibility was studied.The result shows that,from the west to the east,the microstructure of single grain,overhead pore and point contact gradually changes to that of agglomerate or aggregate grain,intergranular pore and surface contact;the loess stratum basically presents the horizontal layered structure with significant differences in the number of layers,the thickness and the collapsibility;the change laws of the compression modulus and the self-weight collapse are on the contrary.The porosity ratio is of largest impact on the coefficient of self-weight collapsibility,followed by the dry density and the water content.The relational expression between the coefficient of self-weight collapsibility and the 4 physical indexes established hereby can be used to predict and analyze loess'coefficient of self-weight collapsibility.The proposed formula predicting and evaluating the self-weight collapse of loess is feasible.

关 键 词：黄土 结构特征 物性指标 自重湿陷性 预测分析 

分 类 号：P642.131[天文地球—工程地质学]