不同压实度路堤边坡的地震残余变形特性
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摘要
为研究地震作用下不同压实度路堤边坡的残余变形特性,设计4种压实度的路堤边坡模型,开展不同压实度路堤边坡的振动台试验研究。通过输入不同强度的汶川波激励,测试不同压实度路堤边坡的侧向残余变形和震陷变形特性,探讨路堤边坡的变形模式。研究结果表明:路堤边坡地震残余变形随压实度降低而增大,且存在界限压实度90%;当压实度小于90%时,地震残余变形显著增大;路堤震陷变形与压实度关系曲线可采用三次多项式来拟合;随着台面加速度峰值的增大,地震残余变形表现出明显的递增趋势,尤其是当加速度峰值大于0.6g时(1 g=9.8 m/s2),路堤边坡变形模式为震陷变形模式。
In order to investigate seismic residual deformation behavior of embankment slopes of different compaction degrees,the models of 4 types of compaction embankment slopes were designed and shaking table model tests were carried out.Wenchuan waves of different intensities were input to test lateral residual deformation and seismic subsidence behavior of embankment slopes.And the deformation models of embankment slopes were examined.The results show that seismic residual deformations of embankment slopes increase with the decrease of compaction degree,and there is a limit compaction degree of 90%.When the compaction degree of embankment slope is less than 90%,seismic residual deformation increases significantly.The relationship between seismic residual deformation and compaction degree can be fitted by cubic polynomial.With the increase of the peak acceleration of input seismic wave,seismic residual deformation shows a significant increasing trend,especially when the peak acceleration is greater than 0.6g(1 g=9.8 m/s2).The deformation modes of embankment slopes are seismic subsidence mode.
In order to investigate seismic residual deformation behavior of embankment slopes of different compaction degrees,the models of 4 types of compaction embankment slopes were designed and shaking table model tests were carried out.Wenchuan waves of different intensities were input to test lateral residual deformation and seismic subsidence behavior of embankment slopes.And the deformation models of embankment slopes were examined.The results show that seismic residual deformations of embankment slopes increase with the decrease of compaction degree,and there is a limit compaction degree of 90%.When the compaction degree of embankment slope is less than 90%,seismic residual deformation increases significantly.The relationship between seismic residual deformation and compaction degree can be fitted by cubic polynomial.With the increase of the peak acceleration of input seismic wave,seismic residual deformation shows a significant increasing trend,especially when the peak acceleration is greater than 0.6g(1 g=9.8 m/s2).The deformation modes of embankment slopes are seismic subsidence mode.
引文
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[2]赵剑明,刘小生,陈宁,等.高心墙堆石坝的极限抗震能力研究[J].水力发电学报,2009,28(5):97-102.ZHAO Jian-ming,LIU Xiao-sheng,CHEN Ning,et al.Research on the maximum anti-seismic capability of high earth core rock-fill dam[J].Journal of Hydroelectric Engineering,2009,28(5):97-102.
[3]Lin M L,Wang K L.Seismic slope behavior in a large-scale shaking table model test[J].Engineering Geology,2006,86(2/3):118-133.
[4]吴伟,姚令侃,陈强.坡形和加筋措施对地震响应影响的振动台模型实验研究[J].重庆交通大学学报:自然科学版,2008,27(5):689-694.WU Wei,YAO Ling-kan,CHEN Qiang.Study on influence of shape and reinforced measures on seismic response in large-scale shaking table model tests[J].Journal of Chongqing Jiaotong University:Natural Science,2008,27(5):689-694.
[5]孔宪京,邓学晶.城市垃圾填埋场地震变形机理的振动台模型试验研究[J].土木工程学报,2008,41(5):65-74.KONG Xian-jing,DENG Xue-jing.Shaking table test on the mechanism of seismically induced deformation of municipal waste landfills[J].China Civil Engineering Journal,2008,41(5):65-74.
[6]Sabermahani M,Ghalandarzadeh A,Fakher A.Experimental study on seismic deformation modes of reinforced-soil walls[J].Geotextiles and Geomembranes,2009,27(2):121-136.
[7]LIU Hua-bei,WANG Xiang-yu,SONG Er-xiang.Reinforcement load and deformation mode of geosynthetic-reinforced soil walls subject to seismic loading during service life[J].Geotextiles and Geomembranes,2011,29(1):1-16.
[8]刘小生,王钟宁,汪小刚,等.面板坝大型振动台模型试验与动力分析[M].北京:中国水利水电出版社,2005:15-27.LIU Xiao-sheng,WANG Zhong-ning,WANG Xiao-gang,et al.Shaking table model test and dynamic analysis of core faceplate rockfill dam[M].Beijing:China Water Power Press,2005:15-27.
[9]陈建斌,周立运.粉煤灰坝动力特性试验研究[J].岩土力学,2005,26(3):437-440.CHEN Jian-bin,ZHOU Li-yuan.Experimental research on dynamic property of fly-ash dam[J].Rock and Soil Mechanics,2005,26(3):437-440.
[10]徐光兴,姚令侃,高召宁,等.边坡动力特性与动力响应的大型振动台模型试验研究[J].岩石力学与工程学报,2008,27(3):624-632.XU Guang-xing,YAO Ling-kan,GAO Zhao-ning,et al.Large-scale shaking table model test study on dynamic characteristics and dynamic response of slope[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(3):624-632.
[11]李昀,杨果林,林宇亮.水平地震作用下绿色加筋格宾挡土墙动力特性试验研究[J].中南大学学报:自然科学版,2010,41(1):347-352.LI Yun,YANG Guo-lin,LIN Yu-liang.Dynamic characteristics of green reinforced gabion walls subjected to horizontal seismic loading[J].Journal of Central South University:Science and Technology,2010,41(1):347-352.
[12]李昀,杨果林,林宇亮.水平地震作用下加筋格宾挡土墙动力特性试验研究[J].岩土工程学报,2009,31(12):1930-1935.LI Yun,YANG Guo-lin,LIN Yu-liang.Dynamic characteristics of reinforced gabion walls subjected to horizontal seismic loading[J].Chinese Journal of Geotechnical Engineering,2009,31(12):1930-1935.
[13]杨林德,季倩倩,郑永来,等.地铁车站结构振动台试验中模型箱设计的研究[J].岩土工程学报,2004,26(1):75-78.YANG Lin-de,JI Qian-qian,ZHENG Yong-lai,et al.Study on design of test box in shaking table test for subway station structure in soft soil[J].Chinese Journal of Geotechnical Engineering,2004,26(1):75-78.
[14]杨果林,钟正,林宇亮.砂黏土变形与强度特性的大型三轴试验研究[J].铁道科学与工程学报,2010,7(5):25-29.YANG Guo-lin,ZHONG Zheng,LIN Yu-liang.Research on deformation and strength behavior of sandy clay based on large-scale triaxial tests[J].Journal of Railway Science and Engineering,2010,7(5):25-29.
[15]李育枢,李天斌,王栋,等.黄草坪2#隧道洞口段减震措施的大型振动台模型试验研究[J].岩石力学与工程学报,2009,28(6):1128-1136.LI Yu-shu,LI Tian-bin,WANG Dong,et al.Large-scale shaking table test for vibration-absorption measures of portal section of Huangcaoping tunnel No.2[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(6):1128-1136.
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