摘要
为模拟自然环境因素对人工填筑路基力学性能的影响,以重塑土为研究对象,试验研究土体回弹模量随含水量和冻融循环次数的变化规律。应用静力成型法,使得土体在最佳含水量下压实成型;通过风干和增湿改变试件的含水量,并经历不同的冻融循环次数后,分别测试土体的无侧限回弹模量。试验结果表明:对于最佳含水量下压实的土体,含水量的初次变化是影响回弹模量的主要因素,含水量8%～17%是回弹模量变化最为敏感区域;土体的回弹模量随冻融循环次数的增加大体上呈衰减趋势,但经历6次冻融循环后其回弹模量趋于稳定;相同的冻融循环次数下,土体压实成型后,风干过程中其回弹模量衰减幅度随着含水量的减小而减小,而增湿过程中其强度衰减幅度基本保持不变。
To simulate the effect of natural environmental factor on the mechanical performance of artificial filling subgrade,the experiments were carried out on the remolded soil and the changing law of the soil resilient modulus with water content and the numbers of freeze-thaw cycles were studied.By the static molding method,the soil sample was compacted from the optimal water contents.The water content of the soil sample was changed by drying and humidification process.After different freeze-thaw cycles,the unconfined resilient moduli of the soil sample were tested respectively.The experiments show that for the compacted soil from the optimal water content,the first change of water content is key factor to affect the resilient modulus of the soil.The change of resilient modulus is most sensitive to water content of 8%-17%.The resilient modulus of the soil with different water contents decrease,totally with the increase of the numbers of the freeze-thaw cycles.However,the resilient modulus tends to be stable after six freeze-thaw cycles.With the same numbers of freeze-thaw cycles,the decreasing magnitude of resilient modulus reduces with the reduce of water content during the drying process after the soil is compacted and remolded;while the decreasing magnitude keeps steady during humidification process.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2009年第A02期3585-3590,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(50708009)
国家西部交通建设科技项目(200731822301-1)
陕西省自然科学基金项目(2006E209)
关键词
土力学
含水量
冻融循环
回弹模量
重塑土
soil mechanics
water content
freeze-thaw cycle
resilient modulus
remoulded soil
