期刊
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
卷 23, 期 11, 页码 3770-3782出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/10298436.2021.1919306
关键词
Seasonally frozen regions; freeze-thaw cycles; cement stabilised subgrade silty soil; static properties; empirical equation
类别
资金
- Graduate Innovation Fund of Jilin University [101832020CX155]
- National Key R&D Program of China [2018YFB1600200]
A series of tests were conducted to evaluate the properties of cement stabilised silty soil, showing that cement content has an impact on shear strength and resilient modulus, and can effectively inhibit the negative effects of freeze-thaw cycles and water content on resilient modulus.
Silty soil as a rich reserved subgrade fills in seasonally frozen regions of northern China, experienced at least one freeze-thaw (F-T) cycle each year. Many damages will occur after F-T cycles. In general, using cement to stabilise can alleviate that situation. Hence, a series of unconsolidated and undrained triaxial compression tests were conducted to evaluate the static properties (i.e. cohesion, internal friction angle, shear strength, stress-strain curves and resilient modulus) of cement stabilised silty soil. Meanwhile, the analysis of variance method was adopted to analyse the effects of multiple factors i.e. F-T cycles, confining pressures, water content and cement content on the resilient modulus. The results showed that the cohesion, shear strength and resilient modulus decreased with F-T cycles and water content, while increased with cement content, and tended to be stable after six cycles. The internal friction angle increased with cement content, whereas had no obvious regularities with F-T cycles and water content. The inclusion of cement could transform the stress-strain curves from strain hardening to strain softening, and inhibited the negative impact of F-T cycles and water content on resilient modulus. Based on the above analysis, w(opt), 2% cement content and the mechanical property index after six F-T cycles could be used as guidance for actual projects. Moreover, an empirical equation for determining the resilient modulus was proposed and validated.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据