纳米MgO-石灰固化黄土路基的力学性能研究
Study on mechanical properties of Nano-MgO lime solidified loess roadbed
凤翔 1贾亮 1郭健 1简刚1
作者信息
- 1. 兰州理工大学土木工程学院,甘肃兰州 730050
- 折叠
摘要
纳米MgO具有不同于传统固化剂的独特性质,在土体固化方面受到了广泛关注.以纳米MgO和石灰综合固化的黄土为研究对象,通过无侧限抗压强度试验、回弹模量试验、承载比试验,对不同固化剂掺量和养护龄期的固化黄土试样的力学性能进行了研究.结果表明:石灰质量分数为3％、纳米MgO质量分数为0.3％～0.6％的固化黄土可兼顾经济、环保及工程性能等多重要素;随着养护龄期的增长,无侧限抗压强度、回弹模量及承载比均逐渐增大,养护前期(14～60 d)固化黄土力学性能指标的增长速度快于养护后期(90～180 d).通过对试验数据的回归拟合,建立了无侧限抗压强度、回弹模量和承载比的力学指标预测模型以及它们之间的关系,为纳米M g O和石灰综合固化黄土路基工程的设计和质量评估提供了参考.
Abstract
Nano-MgO has a characteristic different from traditional curing agents,thus attracting wide attention in soil stabilization.Taking nano-MgO and lime comprehensively solidified loess as the research object,the mechanical properties of solidified loess specimens with different binder material contents and curing periods were studied by conducting the unconfined compressive strength test(UCS),resilience mod-ulus test(E0)and California bearing ratio test(CBR).The results show that the solidified loess with lime content of 3％and nano-MgO content of 0.3％～0.6％can take into account multiple factors such as econo-my,environmental protection and engineering strength.With the increase of curing age,the unconfined compressive strength,resilient modulus and bearing ratio gradually increase.The growth rate of mechanical properties of solidified loess in the early curing period(14～60 d)is faster than that in the later curing period(90～180 d).Through the regression fitting of the experimental data,the mechanical index predic-tion model of unconfined compressive strength,resilient modulus and bearing ratio and the relationship between them are established,which provides a reference for the design and quality evaluation of nano-MgO and lime comprehensive solidified loess subgrade engineering.
关键词
路基工程/固化黄土/力学性能/纳米MgOKey words
Subgrade engineering/Stabilized loess/Mechanical property/Nano-MgO引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据