摘要
针对兰州地区黄土湿陷性问题,通过大量的室内试验,调查了不同埋藏深度黄土各项物理力学指标和湿陷等级的分布规律。在此基础上,采用数理统计方法,分析了天然含水率、孔隙比、干密度、饱和度等基本物理指标与湿陷系数的相关性。研究结果表明,随着土体埋藏深度的增加,黄土湿陷性逐渐降低,其各项物理指标沿深度方向亦呈规律性分布。黄土湿陷系数随着天然含水率、饱和度、干密度、液限、塑限、塑性指数的增大而减小,而随着孔隙比、压缩系数的增加呈增大的趋势。最后,考虑黄土各项物理指标之间存在一定的相关性,因此采用因子分析法,建立黄土湿陷系数与多个物理指标的回归关系,并与现场实测数据进行对比验证其准确性。
A large number of laboratory tests are conducted to investigate the physical and mechanical indexes and collapsibility grades of loess at different burial depths in Lanzhou area of northwest china.The correlation between the coefficient of collapsibility of loess and its basic physical indexes such as natural water content,porosity ratio,dry density and saturation are analyzed by mathematical statistics method.The results show that the collapsibility degree of loess decreases gradually with the increase of buried depth,and the physical indexes of loess also distribute regularly along the depth direction from top to bottom.The collapsibility coefficient of loess decreases with the increase of natural water content,saturation,dry density,liquid limit,plastic limit and plastic index,but increases with the increase of porosity ratio and compression coefficient.Finally,factor analysis method which can eliminate the overlapping effects of primeval variables is used to establish the regression relationship between collapsibility coefficient of loess and its multiple physical indicators,and the calculated value of loess’collapsibility coefficient is confirmed to be reliable by comparing with the field measured data.
作者
张瑜
张兴明
周志军
ZHANG Yu;ZHANG Xing-ming;ZHOUZhi-jun(Gansu Province Highway Aviation Tourism Engineering Consulting Co.Ltd.,Lanzhou 730000,China;CCCC-FHDI Engineering Co.Ltd.,Guangzhou 510230,China;Key Laboratory for Special Area Highway Engineering of Ministry of Education,Chang'an University,Xi'an 710064,China)
出处
《公路》
北大核心
2020年第8期69-75,共7页
Highway
基金
交通运输部科技项目,项目编号2008353361420。
关键词
湿陷性黄土
湿陷系数
影响因素
相关性
collapsible loess
coefficient of collapsibility
influencing factor
correlation
