摘要
针对西北地区湿陷性黄土难以直接作为路基填料的问题,本文结合西和至宕昌高速公路项目,对路基换填技术进行研究。通过界限含水率试验,论证了湿陷性黄土利用石灰和水泥进行改良的实际可行性。进一步通过无侧限抗压强度试验和抗剪强度试验分析了适合工程实际应用的改良黄土填料配比。现场路基换填试验表明随着石灰或水泥配比的提高,改良黄土填料的抗压强度和抗剪强度得以逐步提升,选择适中的配比,更能发挥出改良黄土填料的综合性能。最后,实际工程应用配比为8%的石灰和配比为8%的水泥改良黄土填料对不同路段的湿陷性黄土进行换填,检测表明经改良换填的路基,工程质量良好。
In response to the problem that collapsible loess in the northwest region is difficult to directly serve as subgrade filling material,this paper conducts research on subgrade replacement technology in conjunction with the Xihe-Dangchang Expressway project.The practical feasibility of using lime and cement for improvement of collapsible loess is demonstrated through boundary moisture content tests.Further analysis is conducted on the improved loess filling material ratio suitable for practical engineering applications through unconfined compressive strength tests and shear strength tests.The on-site subgrade replacement test shows that with the increase of lime ratio or cement ratio,the compressive strength and shear strength of the improved loess filling material are gradually improved.Choosing a moderate ratio can better demonstrate the comprehensive performance of the improved loess filling material.Finally,in practical engineering applications,lime with a ratio of 8%and cement with a ratio of 8%are used to replace collapsible loess in different road sections.Testing showed that the improved and replaced subgrade has good engineering quality.
作者
苗国军
MIAO Guojun(Gansu Henghe Transportation Engineering Technology Development Co.,Ltd.,Lanzhou 730070,China)
出处
《科技创新与生产力》
2023年第6期133-136,共4页
Sci-tech Innovation and Productivity
关键词
路基换填
湿陷性黄土
界限含水率
无侧限抗压强度
roadbed replacement
collapsible loess
boundary moisture content
unconfined compressive strength
