动荷载下粉煤灰土冻融损伤特性试验  

Dynamic properties of damage for fly ash soil after freeze-thaw cycles

作　　者：魏海斌[1] 刘寒冰[1] 宫亚峰[1] 何岩[1] 李长雨[1] 

机构地区：[1]吉林大学交通学院,长春130022

出　　处：《哈尔滨工业大学学报》2009年第10期110-113,共4页Journal of Harbin Institute of Technology

基　　金：国家高科技发展计划资助项目(2007AA11z114);国家自然科学基金资助项目(50978117);吉林大学创新团队资助项目(2009)

摘　　要：为研究粉煤灰土作为路基填料的动力特性,通过粉煤灰土冻融循环后的动三轴试验,得出了动强度与冻融循环次数的关系,动模量与冻融循环次数的关系及动模量损伤数学模型,与试验对比结果表明:冻融循环次数与初始动模量预测粉煤灰土路基的动力性能指标的变化,模型具有较高的精度.有助于评估冻融循环对粉煤灰土路基使用寿命的影响.To analyze the dynamic properties of fly ash soil used for roadbed filling, the dynamic triaxial tests on the fly ash soil after freeze-thaw cycles were carried out. Then the relationship between the dynamic strength and the number of freeze-thaw cycles was obtained, and the relationship between the dynamic module and the number of freeze-thaw cycles was obtained as well. A mathematic model of dynamic module damage in freeze-thaw cycles was put forward to predict the dynamic strength and the greatest dynamic module of fly ash soil after 1 freeze - thaw cycle. It is proved that the numerical computation results agree well with experimental results. Thus the presented model can be used to evaluate the service life of fly ash soil roadbed subjected to freeze-thaw cycles.

关 键 词：粉煤灰土 冻融循环 动强度 动模量 预测模型 

分 类 号：TU475[建筑科学—结构工程]