摘要
黄土地基的湿陷性直接影响路基的稳定性。因此,如何采取切实可行的技术措施来减少或消除其湿陷变形是湿陷性黄土路基设计中的一个重要内容。以某高速公路湿陷性黄土为例,进行了水泥配方试验。在不同含水率的黄土中掺入不同比例的水泥,测试了四种不同龄期土样的无侧限抗压强度,分析了改良土强度与生石灰含量及龄期的关系。结果表明:(1)当龄期一定时,黄土的强度随配合比的增大而增大,当水泥配合比在4%-14%之间时,增大幅度比较明显;(2)当试件的配合比一定时,试件的强度随养护时间的增大而增大,28天内强度增长明显,28~90天内增长率较小,90天试样强度趋于稳定;(3)现场试验结果表明,水泥加固法能够有效解决湿陷性黄土路基沉降问题。
The collapsibility of loess foundation directly affects the stability of subgrade. Therefore, how to take feasible technical measures to reduce or eliminate its collapsible deformation is an important content of collapsible loess subgrade design. Taking collapsible loess of an expressway as an example, the cement formula test was carried out. The unconfined compressive strength of four soil samples of different ages was tested by mixing different proportions of cement into loess with different water content, and the relationship between the strength of improved soil and the content and age of quicklime was analyzed. The results show as follows: 1) When the age is constant,the strength of loess increases with the increase of the proportion of cement, and when the proportion of cement is between 4%-14%, the increase is more obvious. 2) When the mixture ratio of specimens is constant, the strength of specimens increases with the increase of curing time, and the strength increases significantly within 28 days, while the growth rate is small within 28-90 days, and the strength of specimens tends to be stable within 90 days. 3) The field test results show that cement reinforcement method can effectively solve the settlement problem of collapsible loess subgrade.
作者
周子刚
张顺利
Zhou Zigang;Zhang Shunli(Lanzhou Branch of Beijing General Municipal Engineering Design&Research Institute Co.,Ltd.,Lanzhou 730070,China;Shaanxi Provincial Transport Planning Design and Research Institute Co.,Ltd.,Xi'an 710000,China)
出处
《科学技术创新》
2022年第11期121-124,共4页
Scientific and Technological Innovation
关键词
路基工程
湿陷性黄土
水泥加固法
室内试验
现场试验
Roadbed engineering
Collapsible loess
Cement reinforcement method
Laboratory test
Field test
