摘要
黄土广泛分布于我国西北地区,具有湿陷性、承载力低等特点,对工程造成严重的影响。文章在小应力状态下进行了研究,以初始含水量、干密度、自重压力、超固结比为变化因素,设计正交试验方案进行了影响黄土的湿陷性因素的试验研究,阐明了其中的内在原因,揭示了黄土的作用机理。试验表明:对黄土温陷性影响的主次顺序为初始含水量、超固结比,干密度、自重压力。得出影响最显著的组合方案为初始含水量10%、超固结比1.0、干密-度1.4 g/cm^3、自重压力150 kPa。湿陷系数随初始含水量、干密度、超固结比的增大而减小,在小应力作用下,随自重压力的增大而增大。以正交试验结果分析为基础,以自重压力为变化因素进行单因素试验,分析研究了湿陷系数与自重起始压力的相关关系。
The loess widely distributes in northwestern China, it has the collapsibility and low load-carrying characteristics, causes severe impact on engineering. This paper, under the condition of low stress, with initial water content, dry density and gravity stress, over-consolidated ratio as changing factors, has designed orthogonal experiment in order to carry out experimental research on influence factors of loess collapsibility, expounds its inner cause, and reveals its function mechanism. The experiment indicates that the successive sequence which influences loess collapsibility is initial water content, super consolidation ratio and dry density, so that the significant influence combination is 10% of initial moisture, 1.0 of super consolidation ratio, 1.4 g/cm^3 of dry density as well as 150 kPa of deadweight pressure. Collapsibility coefficient will decrease with the increase of initial water content, dry density and super consolidation ratio, though in low stress condition, increase with the increase of deadweight pressure. Based on the resuhs of orthogonal experiment, the single factor experiment has been carried out with deadweight pressure as the changing factor, and analyzes the interaction of collapsibility coefficient and initial deadweight pressure.
出处
《高速铁路技术》
2011年第1期4-7,共4页
High Speed Railway Technology
关键词
黄土
湿陷性
作用机理
loess
collapsibility
function mechanism
