常规物理力学性质指标在湿陷机理上的体现

Mechanisms of Collapse Shown on Physical Mechanics Index of the Routine Soil Test

研究目的:湿陷性为黄土的主要工程地质问题,其产生机理极其复杂,产生原因多种多样,需进一步深入研究。研究方法:基于现有文献对黄土的湿陷原因与机理的认识,以甘肃黄土地区高等级公路黄土分区项目为例,利用多元统计分析方法中的因子分析对甘肃陇西陇东地区黄土的59组样本的9个常规试验的物理力学指标数据进行了分析,在此基础上,对黄土湿陷机理内因进行了分析。研究结论:黄土的湿陷性指标与其它物理力学指标存在相关性,同时,揭示出产生湿陷的黄土必须有湿陷空间及一定量遇水强度降低的联接,黄土的疏松性、多孔性正是其反映,特别是支架孔隙是导致黄土湿陷的最主要原因,而非饱和黄土是产生湿陷的前提,粘粒含量及粘土的水-胶联结在产生湿陷过程中的作用需要进一步商榷。此外,本方法解决了常规单因子分析因指标交叉而分析失真的缺陷。

Research purposes： The collapsible is the most important engineering geology problem of loess, but the mechanisms and the reason of collapse is a considerably difficult problem and we need lucubrate. Research methods：Based on the understanding of the existing literature to the loess the reason and the mechanism, taking the loess classification sub - area project of motorway in loess regions of Gansu Province for example, the 9 physical mechanics index of the 59 groups are picked out in the routine soil test data. And the author uses factor analysis of multivariable statistical analysis methods to analyze loess physical mechanics index and has discussed the essential reason of loess collapsible. Research conclusions：Between collapsible index of loess and other physical mechanics index of loess exist relevance, the foundation of loess collapsible is the space of loess, non - saturated loess and the joint of loess which meet the water intensity reduces, the main reason of loess collapsible is support hole existence. The loose and the porosity reflected the support hole existence. The clay content and the clay joint in collapsible the function need further to discuss. Simultaneously, the result also indicates factor analysis to analyze loess is superior in solving the problem that it can not be shown for cross of index in general single factor analysis.