不同成因砂质黄土物理力学特性和湿陷性评价研究  

Study on Physical and Mechanical Properties and Collapsibility Evaluation of Sandy Loess of Different Genesis

作　　者：刘柏林 LIU Bailin(China Railway Fifth Survey and Design Institute Group Co.Ltd.,Beijing 102600,China)

机构地区：[1]中铁第五勘察设计院集团有限公司,北京102600

出　　处：《铁道建筑技术》2022年第6期9-13,共5页Railway Construction Technology

基　　金：中铁第五勘察设计院集团有限公司科技研究开发计划项目(ZLKZ-FW-2019-18)。

摘　　要：黄土成因对黄土性质具有本质影响,使得不同成因黄土物理力学特性存在较大差异。本文对西北某山区铁路第四系全新统冲洪积和第四系上更新统风积砂质黄土进行室内试验研究,通过不同成因砂质黄土物理力学参数与湿陷系数的相关性分析发现,含水率/饱和度、孔隙比和干密度与湿陷系数具有较高相关性;选取含水率/饱和度、孔隙比、干密度采用多元线性回归创建不同成因砂质黄土湿陷性评价方法,以期为本地区不同成因砂质黄土场地湿陷性评价提供参考。The genesis of loess has an essential influence on the properties of loess,which makes the physical and mechanical properties of loess of different genesis have quite different characteristics.In this article,a research is conducted on the indoor test results of quaternary holocene alluvial proluvial and quaternary upper pleistocene aeolian sandy loess of a railway in Northwest China.Through the correlation analysis between physical and mechanical parameters and collapsibility coefficient of sandy loess of different genesis,it is found that water content/saturation,void ratio and dry density have high correlation with collapsibility coefficient.The collapsibility evaluation method of sandy loess of different genesis is established by selecting water content/saturation,void ratio and dry density by multiple linear regression,hoping to provide a reference for the collapsibility evaluation of sandy loess sites of different genesis in this area.

关 键 词：不同成因 砂质黄土 物理力学特性 湿陷性评价 室内试验 相关性分析 多元线性回归 

分 类 号：TU411.2[建筑科学—岩土工程]