摘要
近年来,随着道路工程建设的高速发展,压实黄土因竖向压缩引起的路基沉陷问题日益严重。以往学者的研究主要集中在影响压实黄土变形的含水率、孔隙率、饱和度等因素方面,忽略了侧向约束条件以及不同压实度对压实黄土的影响。为解决以上问题,该文以陕北地区G307道路改扩建工程为依托,现场选取路基压实土样开展室内压缩试验。通过施加不同的侧向约束条件,分析竖向多级荷载作用下压实黄土在不同压实度和围压条件下的应力‒应变曲线。结果表明:土样的竖向压缩量与施加的竖向荷载呈正相关,而与压实度呈负相关;围压与侧向约束均能降低土样的竖向压缩量。该结果反映了土样在实际工程中的工作状态,可为黄土区路基填筑提供借鉴和指导。
In recent years,with the rapid development of road engineering construction,subgrade settlement caused by vertical compression of compacted loess has become increasingly serious.The previous research on the deformation of compacted loess mostly focuses on moisture content,porosity,saturation,and other aspects,ignoring the influence of lateral constraint conditions and different compaction on compacted loess.To address these issues,based on the reconstruction and expansion project of G307 road in northern Shaanxi,this paper selected compacted soil samples of subgrade on site to carry out indoor compression tests.By applying different lateral constraint conditions,the stress-strain curves of compacted loess subjected to vertical multistage load under different compactness and confining pressures were analyzed.The results indicate that the vertical compression of soil samples is positively correlated with the applied vertical load and inversely correlated with compactness.Confining pressure and lateral constraint can reduce the vertical compression of soil samples.The results reflect the working state of the soil sample in the actual project,providing reference and guidance for the subgrade filling in the loess region.
作者
常应红
赵金朋
张晓轴
杨浩
李哲
邵登峰
刘路路
CHANG Yinghong;ZHAO Jinpeng;ZHANG Xiaozhou;YANG Hao;LI Zhe;SHAO Dengfeng;LIU Lulu(Yulin Highway Bureau,Yulin,Shaanxi 719199,China;Highway College,Chang’an University,Xi’an,Shaanxi 710064,China;State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)
出处
《中外公路》
2024年第4期64-72,共9页
Journal of China & Foreign Highway
基金
长沙理工大学公路养护技术国家工程研究中心开放基金资助项目(编号:kfj220104)。
关键词
压实黄土
路基沉陷
约束条件
压实度
围压
compacted loess
subgrade settlement
constraint condition
compactness
confining pressure
