摘要
针对黄土湿陷性对路基工程引起的不均匀沉降灾害,结合国道G310三门峡西至豫陕界段新建工程,采用固结仪对黄土原状样和不同初始干密度的重塑样进行了一系列湿陷性试验和微观定量分析。试验结果表明:在同一初始干密度下,黄土原状样的湿陷性高于重塑样的,且黄土重塑样的湿陷性随着初始干密度的增大逐渐降低,当初始干密度为1.6 g/cm 3时,其湿陷性不明显;同一初始干密度下,黄土原状样的总体孔隙量高于重塑样的,且黄土重塑样的总体孔隙量随着干密度的增大逐渐降低;黄土原状样和不同初始干密度下重塑样的湿陷性与其内部孔隙尺寸有关,即干密度较小时,黄土内部的大多数孔隙尺寸大于其颗粒尺寸,呈架空结构,因而具有强烈的湿陷性。
In view of the uneven settlement disaster caused by the collapsibility of loess in roadbed engineering,a series of collapsibility tests and micro quantitative analysis were conducted on the original loess samples and reshaped samples with different initial dry densities using a consolidation instrument in conjunction with the new construction project of the section from Sanmenxia West to Henan Shaanxi boundary of National Highway G310.The results are as follows.At the same initial dry density,the collapsibility of the original loess sample was higher than that of the remolded sample,and the collapsibility of the remolded loess sample gradually decreased with the increase of the initial dry density.When the initial dry density is 1.6 g/cm 3,its collapsibility is not significant.At the same initial dry density,the overall pore volume of the undisturbed loess sample is higher than that of the remolded loess sample,and the overall pore volume of the remolded loess sample gradually decreases with the increase of the dry density.The collapsibility of undisturbed loess samples and reshaped samples with different initial dry densities is related to their internal pore sizes.That is,when the dry density is low,most of the pore sizes inside the loess are larger than their particle sizes,forming an elevated structure and thus exhibiting strong collapsibility.
作者
赵鑫鑫
姜彤
赵金玓
张俊然
ZHAO Xinxin;JIANG Tong;ZHAO Jindi;ZHANG Junran(College of Geosciences and Engineering,North China University of Water Resources and Electric Power,Zhengzhou 450046,China)
出处
《华北水利水电大学学报（自然科学版）》
北大核心
2023年第3期89-93,101,共6页
Journal of North China University of Water Resources and Electric Power：Natural Science Edition
基金
河南省高等学校青年骨干教师培养计划项目(2020GGJS-094)
河南省高等学校重点科研项目(21A410002)。
关键词
原状黄土
重塑黄土
湿陷性
压汞试验
孔隙尺寸
undisturbed loess
remolded loess
collapsibility
mercury intrusion test
pore size
