黄土高填方是岩土工程领域的热点问题,其地基稳定与沉降也是填方地区的重点关注问题,而要准确地预测填方区的地基总沉降量或工后沉降量数据,就需要对压实黄土的压缩变形规律进行研究。通过大量室内侧限压缩试验研究高填方地区压实黄土的压缩变形规律,分析不同地区压实黄土在不同条件下的应力-应变曲线,讨论其压缩特性及变化规律,通过复合幂-指数(CPE)模型建立了描述压实黄土侧限条件下应力-应变曲线的表达方法。结果表明:侧限条件下,压实黄土的应变随竖向应力的逐级增加而增加;不同场地、沉积时代压实黄土的压缩变形规律基本相似,施加相同竖向应力时,应变随含水率的降低而减小,随压实度的增加而减小;随着压实度的增加,试样抵抗变形的能力越来越强;而随着含水率的增加,土体抵抗变形的能力被削弱。考虑到含水率与压实度,将不同沉积时代下CPE模型参数进行定量描述,压实黄土在侧限条件下的应力-应变曲线数学模型在吕梁Q3黄土中的应用,说明了该模型的准确性与合理性,为研究压实黄土的压缩变形提供了新思路。

The high fill of loess is a hot issue in the field of geotechnical engineering, and its foundation stability and settlement are also the key issues in the filling area. To predict the total settlement or post- construction settlement data of the foundation in the filling area, it is necessary to study the compression deformation law of compacted loess. Through a large number of indoor confined compression tests, the             compression deformation law of compacted loess in high fill area are examined. The stress-strain curves of compacted loess in different areas under different conditions are analyzed, and the compression char- acteristics and variation rules are discussed. The expression method of stress-strain curve under con- fined condition of compacted loess is established by Composite Power Exponent( CPE) model. The re- sults show that the strain of compacted loess increases with the increase of vertical load under the con- dition of lateral restriction. The compression deformation law of compacted loess in different sites and sedimentary ages is basically similar. When the same vertical load is applied, the strain decreases with the decrease of water content and decreases with the increase of compaction degree. As the degree of compaction increases, the ability of the sample to resist deformation becomes ever stronger; with the in- crease of water content, the ability of soil to resist deformation is weakened. Considering the water con- tent and compaction degree, the parameters of the CPE model are quantitatively described. The applica- tion of the mathematical model of the stress-strain curve of the compacted loess under lateral confine- ment in Lvliang Q  loess shows the accuracy and rationality of the model, which provides a new idea for exploring the compression deformation of compacted loess.