沥青混凝土心墙材料动力特性试验研究
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摘要
对沥青混凝土心墙材料进行不同温度、围压及固结比的动力试验,研究了沥青混凝土心墙材料的动力特性。研究结果表明,在相同的试验条件下,沥青混凝土心墙材料动弹性模量受动应变幅值的影响较小,动应力-动应变骨干曲线近似为直线,可以采用通过原点的直线来描述其骨干曲线,取直线的斜率作为这一状态下的动模量;在相同的试验温度与应力比条件下,动弹模量Ed与平均固结应力m可以建立关系式Ed=kpa(m/pa)n;沥青混凝土是典型的流变材料,随着温度的升高,沥青混凝土逐渐由弹性向黏弹性转变,动模量逐渐降低,阻尼比增大。
To study the dynamic properties of asphalt concrete core materials,a series of dynamic triaxial experiments are conducted under different cell pressures,temperatures and consolidation ratios.The results show that dynamic elastic modulus is less affected by the extent of dynamic strain under the same experimental conditions.The stress-strain backbone curve can be described by a straight line through the origin,the slope of which is regard as the elastic modulus.The formula Ed=kpa(σm/pa)n presents the relationship of elastic modulus and mean sustained stress under the same temperature and stress ratio.Due to the rheological properties of asphalt concrete core materials,the elastic modulus decreases and the damping ratio increases with the rising of the temperature.
To study the dynamic properties of asphalt concrete core materials,a series of dynamic triaxial experiments are conducted under different cell pressures,temperatures and consolidation ratios.The results show that dynamic elastic modulus is less affected by the extent of dynamic strain under the same experimental conditions.The stress-strain backbone curve can be described by a straight line through the origin,the slope of which is regard as the elastic modulus.The formula Ed=kpa(σm/pa)n presents the relationship of elastic modulus and mean sustained stress under the same temperature and stress ratio.Due to the rheological properties of asphalt concrete core materials,the elastic modulus decreases and the damping ratio increases with the rising of the temperature.
引文
[1]岳跃真,郝巨涛,孙志恒,等.水工沥青混凝土防渗技术[M].北京:化学工业出版社,2007.(YUE Yue-zhen,HAOJu-tao,SUN Zhi-heng,et al.Seepage control technique ofhydraulic asphalt concrete[M].Beijing:Chemical IndustryPress,2007.(in Chinese))
[2]朱晟.沥青混凝土心墙堆石坝三维地震反应分析[J].岩土力学,2008,29(11):2933-2938.(ZHU Cheng.3-Dseismic response analysis of rockfill dam with asphaltconcrete core[J].Rock and Soil Mechanics,2008,29(11):2933-2938.(in Chinese))
[3]初伟.土石坝沥青混凝土心墙材料基本性能研究——蠕变和动力特性研究[D].西安:西安理工大学,2004.(CHUWei.Study on the fundamental properties of asphalt concretecores for embankment dams[D].Xi'an:Xi'an University ofTechnology,2004.(in Chinese))
[4]WANG Wei-biao,HOEG Kaare.Cyclic behavior of asphaltconcrete used as impervious core in embankment dams[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2011:536-544.
[5]四川大渡河黄金坪水电站大坝沥青混凝土心墙材料试验研究报告[R].武汉:长江科学院,2012.(The test report ofasphalt concrete core material of Huangjinping hydroelectricpower station[R].Wuhan:The Yangtze River ScientificResearch Institude,2012.(in Chinese))
[6]DL/T5362—2006.水工沥青混凝土试验规程[S].北京:中国电力出版社,2007.(DL/T5362—2006Test code forhydraulic bitumen concrete[S].Beijing:China Electric PowerPress,2007.(in Chinese))
[2]朱晟.沥青混凝土心墙堆石坝三维地震反应分析[J].岩土力学,2008,29(11):2933-2938.(ZHU Cheng.3-Dseismic response analysis of rockfill dam with asphaltconcrete core[J].Rock and Soil Mechanics,2008,29(11):2933-2938.(in Chinese))
[3]初伟.土石坝沥青混凝土心墙材料基本性能研究——蠕变和动力特性研究[D].西安:西安理工大学,2004.(CHUWei.Study on the fundamental properties of asphalt concretecores for embankment dams[D].Xi'an:Xi'an University ofTechnology,2004.(in Chinese))
[4]WANG Wei-biao,HOEG Kaare.Cyclic behavior of asphaltconcrete used as impervious core in embankment dams[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2011:536-544.
[5]四川大渡河黄金坪水电站大坝沥青混凝土心墙材料试验研究报告[R].武汉:长江科学院,2012.(The test report ofasphalt concrete core material of Huangjinping hydroelectricpower station[R].Wuhan:The Yangtze River ScientificResearch Institude,2012.(in Chinese))
[6]DL/T5362—2006.水工沥青混凝土试验规程[S].北京:中国电力出版社,2007.(DL/T5362—2006Test code forhydraulic bitumen concrete[S].Beijing:China Electric PowerPress,2007.(in Chinese))
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