变温度区间冻融循环下石灰改良路基土回弹模量衰减规律及原因解析  

The Attenuation Law and Reasons Analysis of Lime Modified Subgrade Soil Resilience Modulus on Different Frozen-thawed Circle Temperature Range

作　　者：韩春鹏[1] 何东坡[1] 贾艳敏[1] 程培峰[1] 

机构地区：[1]东北林业大学土木工程学院,哈尔滨市150040

出　　处：《公路》2013年第9期14-18,共5页Highway

基　　金：中央高校基本科研业务费专项资金资助;项目编号DL11BB07;黑龙江省交通厅重点科技项目;项目编号HJ20080011

摘　　要：针对路基冻融界面处土体受到不同冻融温度作用影响，进行了变温度区间冻融循环下石灰改良土回弹模量的室内试验。试验结果表明，回弹模量随着含水率的增加而降低，随冻融循环次数的增加而逐渐下降，至6次循环时基本稳定；随着冻融循环低温下限温度的逐渐降低，其回弹模量衰减率逐渐增大，当温度降至-9℃时，冻融后回弹模量衰减率不再发生变化，主要原因是由于-9℃～0℃是土中水发生相变的过渡温区，土中水冻结比例随温度下限下隆诼繇井寓．Aim on the fact that subgrade soil on frozen-thawed interface is affected differently by different frozen-thawed temperature, the laboratory test about lime modified soil resilience modulus on frozen-thawed circle was done. The result indicated： the resilience modulus decreased with moisture content and times of frozen-thawed cycle, resilience moduius went to stable at 6th times of frozen-thawed cycle; The lower the floor temperature of freezing and thawing is, the more attenuation ratio of resilience modulus, attenuation ratio of resilience modulus went to stable when temperature arrived--9℃, The research indicating -9℃- 0℃ was regarded as the transitional temperature range of moisture phase transition and moisture in soil frozen ratio increased with decrease of the floor temperature of freezing and thawing, which increased effect to soil structure.

关 键 词：石灰改良土 衰减规律 冻融循环 回弹模量 

分 类 号：U416.1[交通运输工程—道路与铁道工程]