延安新区黄土湿陷性与其物性指标的相关性分析  

Correlation analysis between collapsibility and physical properties of loess in Yan’an New District

作　　者：唐辉 张瑞松 高建中 TANG Hui;ZHANG Rui-song;GAO Jian-zhong(China Jikan Institute of Engineering Investigation and Design Co.,Ltd./Shaanxi Key Laboratory for the Property and Treatment of Special Soil and Rock,Xi’an 710043,Shaanxi,China;Yan’an New District Management Committee,Yan’an 716000,Shaanxi,China)

机构地区：[1]机械工业勘察设计研究院有限公司/陕西省特殊岩土性质与处理重点实验室,陕西西安710043 [2]延安市新区管理委员会,陕西延安716000

出　　处：《地基处理》2023年第1期19-24,共6页Journal of Ground Improvement

基　　金：延安市成果转化与推广应用专项项目(2019ZCGZ-014)。

摘　　要：湿陷系数是评价黄土湿陷性的重要指标,根据黄土物理力学指标可快速预测和评价其湿陷系数,故有必要对黄土湿陷性与其物性指标之间的关系进行研究。针对延安新区湿陷性马兰黄土,采用数理统计及理论分析,系统研究了马兰黄土湿陷系数与含水量、干重度、孔隙比、饱和度之间的关系。研究结果表明:对于延安新区马兰黄土,湿陷系数与含水量、干重度、饱和度呈负相关,与孔隙比呈正相关;湿陷性的界限含水量为17%,界限干重度为14.5 kN·m^(-3),起始孔隙比为0.9,界限饱和度为50%;相对比而言,对湿陷系数影响最大的因子为饱和度,孔隙比、干重度次之,含水量与湿陷系数相关性较低。最后通过多元线性回归分析,提出了用多个物理指标评价及预测黄土湿陷性的经验公式,并验证了该公式的准确性和合理性,在工程实践中具有一定的参考价值。The collapsibility coefficient is an important index to evaluate the collapsibility of loess. According to the physical and mechanical indexes, the collapsibility coefficient of loess can be quickly predicted and evaluated. Therefore,it is necessary to study the relationship between the collapsibility of loess and its physical properties. Using mathematical statistics and theoretical analysis, the relationship between the collapsibility coefficient and water content, dry weight,void ratio and saturation of Malan Loess in Yan’an New District is systematically studied. The results show that for Malan Loess in Yan’an New District, the collapsibility coefficient is negatively correlated with the water content, dry weight and saturation, but positively correlated with void ratio. The limit moisture content of collapsibility of Malan Loess is 17%, the limit dry weight is 14.5 kN·m^(-3), the initial void ratio is 0.9, and the limit saturation is 50%. In comparison, the factor that has the greatest influence on the collapsibility coefficient is the saturation, followed by pore ratio and dry weight, and the correlation between the water content and the collapsibility coefficient is lower. Finally, an empirical formula for evaluating and predicting the loess collapsibility with multiple physical indexes is proposed through multiple linear regression analysis. The accuracy and rationality of the empirical formula are verified, and it has important reference value in engineering practice.

关 键 词：湿陷性评价 延安新区 马兰黄土 相关性分析 回归分析 

分 类 号：TU472[建筑科学—结构工程]