以深圳市花岗岩残积土为研究对象,考虑氧化铁含量、含水率及干密度影响,对压实花岗岩残积土进行崩解试验研究。结果表明:压实花岗岩残积土遇水快速崩解,崩解过程中崩解物以小颗粒-碎屑-泥状形式逐渐剥离于土样,直至完全崩解。土的崩解过程主要受氧化铁含量影响,物理状态对其影响程度较小。土的崩解速率随时间的变化规律主要呈先迅速增大后快速减小、迅速增大后保持稳定和出现多个峰值3种模式;最大崩解速率随其氧化铁含量的增加而逐渐增大,随土样含水率和干密度的增大而减小;土样的完全崩解时间受其含水率的影响程度与其干密度有关,土样干密度较小时,其完全崩解时间变化范围较小,而当干密度>1.50 g/cm3时完全崩解时间随含水率的增大呈增大趋势;相同含水率时,土样的完全崩解时间随干密度的增大逐渐增大。
Abstract
Disintegration test of compacted granite residual soil taken from Shenzhen was carried out in consideration of iron oxide content, water content, and dry density. Test results demonstrated that the compacted granite residual soil disintegrated quickly, during which the disintegrated materials gradually peeled off from the soil specimen from the form of small particles to debris and then to mud, until the soil sample completely disintegrated. The disintegration process of soil was mainly affected by the content of iron oxide rather than by the physical state of soil specimen. The disintegration rate of compacted granite residual soil changed with time in three modes: surged at first and then plummeted; surged at first and then stabilized; multiple peaks appeared. The maximum disintegration rate climbed with the expansion of iron oxide content but dropped with the increase of the water content and dry density. The degree of the impact of water content on complete disintegration time depended on dry density. In the presence of small dry density, the time required for complete disintegration changed within a small range; when dry density exceeded 1.50 g/cm3, the time required for complete disintegration elongated gently with the rise of water content. Given the same water content, the time required for complete disintegration gradually increased with the rising of dry density.
关键词
道路工程 /
花岗岩残积土 /
崩解特性 /
氧化铁 /
干密度 /
含水率
Key words
road engineering /
granite residual soil /
disintegration characteristics /
iron oxide /
dry density /
water content
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基金
国家自然科学基金项目(51709290);岩土力学与工程国家重点实验室开放基金项目(Z019020);河南省高等学校青年骨干教师培养计划项目(2020GGJS136,2019GGJS142);中原工学院自主创新应用研究项目(21001507)
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