不同压实度路堤边坡的地震残余变形特性
来源期刊：中南大学学报(自然科学版)2012年第9期
论文作者：林宇亮 杨果林
文章页码：3631 - 3638
关键词：路堤边坡；压实度；地震残余变形；振动台试验
Key words：embankment slope; compaction degree; seismic residual deformation; shaking table test
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。
Abstract: 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.
林宇亮，杨果林
(中南大学 土木工程学院，湖南 长沙，410075)
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。
关键词：路堤边坡；压实度；地震残余变形；振动台试验
LIN Yu-liang, YANG Guo-lin
(School of Civil Engineering, Central South University, Changsha 410075, China)
Abstract: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.
Key words:embankment slope; compaction degree; seismic residual deformation; shaking table test
