| 冻融循环条件下延迟时间对水泥改良低液限粉土动力特性影响试验研究 |
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| 引用本文： | 付兵先,张千里,史存林,马伟斌.冻融循环条件下延迟时间对水泥改良低液限粉土动力特性影响试验研究[J].中国铁道科学,2010,31(1). |
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| 作者姓名： | 付兵先 张千里 史存林 马伟斌 |
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| 作者单位： | 中国铁道科学研究院铁道建筑研究所,北京,100081 |
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| 基金项目： | 铁道部科技研究开发计划项甘 |
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| 摘 要： | 模拟路基真实的冻融循环过程,设计冻融试验,制作冻融试验箱,进行改良土试样的冻融循环试验。通过动三轴试验,研究在冻融条件下,延迟时间对水泥改良低液限粉土的动强度、动弹性模量、动变形以及超孔隙水压力的影响。结果表明:在相同的冻融次数下,动强度和破坏循环次数随着延迟时间的增加而降低;在相同的冻融次数及一定动荷载幅值作用下,屈服应变则随着延迟时间的增加而增加;延迟时间短的试样,动弹性模量值较大,但随应变的衰减较平缓,且趋于一个稳定值;不同延迟时间试样达到相同应变幅值时所增长的孔压值不同,延迟时间越长,孔压越大;当轴向应变幅值大于10-3后,产生累积孔隙水压力。
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| 关 键 词： | 铁路路基 低液限粉土 改良土 延迟时间 冻融循环 动力特性 |
Experimental Research on the Effect of the Delay Time under Freezing-Thawing Cycle to the Dynamic Characteristics of the Improved Cemented Low Liquid Limit Silt |
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| FU Bingxian,ZHANG Qianli,SHI Cunlin,MA Weibin.Experimental Research on the Effect of the Delay Time under Freezing-Thawing Cycle to the Dynamic Characteristics of the Improved Cemented Low Liquid Limit Silt[J].China Railway Science,2010,31(1). |
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| Authors: | FU Bingxian ZHANG Qianli SHI Cunlin MA Weibin |
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| Institution: | FU Bingxian,ZHANG Qianli,SHI Cunlin,MA Weibin(Railway Engineering Research Institute,China Academy of Railway Sciences Beijing 100081,China) |
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| Abstract: | For analoging the practical process of freezing-thawing cycle to subgrade,the freezing and thawing cycle test for soil-cement was proceeded by designing the scheme of freezing and thawing cycle test and then making the proof box for freezing and thawing cycle.Through the dynamic triaxial tests on the cemented low liquid limit silt subject to freezing and thawing cycles,effects of the delay time on the dynamic strength,the dynamic elastic modulus,the dynamic deformation,and the excess pore water pressure of ... |
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| Keywords: | Railway subgrade Low liquid limit silt Improved soil Delay time Freezing-thawing cycle Dynamic characteristics |
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