结构性对压实黄土侧限压缩特性的影响

发布时间：2018-09-10 17:06

【摘要】：对一定试验含水率及干密度下具有不同结构性(排列)的压实黄土试样进行侧限压缩试验,分析制样含水率引起的结构性变化对不同试验含水率压实黄土侧限压缩特性的影响,探讨压缩性指标与初始结构性参数之间的关系。以饱和压实黄土的压缩曲线为基础,通过引入反映结构性影响的初始结构性参数,提出压实黄土压缩曲线的表达式,根据此表达式可以确定湿载耦合时压实黄土的压缩变形。研究结果表明:制样含水率引起的结构性变化对压实黄土的侧限压缩特性有一定的影响,影响程度随试验含水率增大而减小,对饱和压实黄土压缩特性几乎没有影响;压实土的初始结构性随制样含水率的增大或试验含水率的减小而增强,弹性指数基本上不受结构性的影响,结构屈服压力及压缩指数皆随初始结构性参数增大而增大。在不同的试验含水率及制样含水率下,压缩指数及结构屈服压力与初始结构性参数之间皆有良好的归一化非线性关系,且可用以饱和压实黄土的压缩性指标为参照状态的双曲线来描述。
[Abstract]:Lateral compression tests were carried out on compacted loess samples with different structural (arrangement) under certain test moisture content and dry density. The effects of structural changes caused by water content on the compression characteristics of loess were analyzed. The relationship between compressibility index and initial structural parameters is discussed. Based on the compression curve of saturated compacted loess, an expression of compression curve of compacted loess is put forward by introducing the initial structural parameters reflecting structural influence. According to this expression, the compression deformation of compacted loess under wet load coupling can be determined. The results show that the structural changes caused by the moisture content of the sample have a certain influence on the compression characteristics of the compacted loess, and the influence degree decreases with the increase of the water content in the test, but has little effect on the compression characteristics of the saturated compacted loess. The initial structure of compacted soil increases with the increase of sample water content or the decrease of experimental moisture content, and the elastic index is not affected by structure. The yield pressure and compression index of compacted soil increase with the increase of initial structural parameters. Under different experimental water content and sample water content, there is a good normalized nonlinear relationship between compression index, structure yield pressure and initial structural parameters. And it can be used to describe the compressibility index of saturated compacted loess as the hyperbolic of reference state.
【作者单位】：西安理工大学岩土工程研究所;郑州市热力总公司;北京迈达斯技术有限公司;
【基金】：国家自然科学基金资助项目(50878183) 陕西省教育厅省级重点实验室重点科研资助项目(2010JS086) 西安理工大学2012年度特色研究计划项目(118 211302)
【分类号】：TU444

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