近断层地震动对边坡稳定性的影响
|
摘要
为研究近断层地震动特性及其入射方向对边坡地震响应的影响,首先,考虑边坡对地震波的散射规律,提出了一种能够考虑地震波任意角度入射的地震动输入方法,该方法能够准确考虑模型边界两侧的动力相互作用且简单易操作。其次,运用提出的地震动输入方法,通过有限元参数分析研究了地震波入射角对边坡地震响应的影响规律。结果表明:当同时考虑P波及SV波入射时,由于两种波形的叠加作用,边坡的放大效应较一种波形单独作用时更加显著,且坡面上加速度分布更不均匀。地震波的入射角能够显著影响边坡的地震响应,随着地震波入射方向与坡面间夹角的增加,边坡对地震动的放大效应越明显,坡面上加速度分布越不均匀。
Therefore, the aim of this study is to investigate the influences of the characteristics and incident angle of the near-fault ground motion on the seismic response of slopes. First, based on the propagating law of seismic waves near slopes, an earthquake input method was proposed for seismic analyses of slopes subjected to obliquely incident waves. The proposed method can accurately consider the dynamic interaction between the two sides of the model at boundaries. Then, a parametric study was conducted to study the influence of the incident angle on the seismic response of slopes. The results show that when both the SV and P waves are applied, the amplification effect of the slope is more significant owing to the superposition of SV and P waves. Besides, the distribution of the acceleration at the slop becomes more non-uniform. The incident angle of the input motion has a significant effect on the seismic response of slopes. Moreover, as the angle between the incident direction and the slope surface increases, the amplification effect of the slope becomes more significant.
Therefore, the aim of this study is to investigate the influences of the characteristics and incident angle of the near-fault ground motion on the seismic response of slopes. First, based on the propagating law of seismic waves near slopes, an earthquake input method was proposed for seismic analyses of slopes subjected to obliquely incident waves. The proposed method can accurately consider the dynamic interaction between the two sides of the model at boundaries. Then, a parametric study was conducted to study the influence of the incident angle on the seismic response of slopes. The results show that when both the SV and P waves are applied, the amplification effect of the slope is more significant owing to the superposition of SV and P waves. Besides, the distribution of the acceleration at the slop becomes more non-uniform. The incident angle of the input motion has a significant effect on the seismic response of slopes. Moreover, as the angle between the incident direction and the slope surface increases, the amplification effect of the slope becomes more significant.
引文
[1] 郑颖人,叶海林,黄润秋.地震边坡破坏机制及其破裂面的分析探讨[J].岩石力学与工程学报,2009,28(8):1714-1723.
[2] 李海波,肖克强,刘亚群.地震荷载作用下顺层岩质边坡安全系数分析[J].岩石力学与工程学报,2007,26(12):2385-2394.
[3] 刘丽萍,王思长.地震作用下高边坡稳定性验算及监测分析[J].水利与建筑工程学报,2015,13(1):60-64.
[4] 杨长卫,张建经,周德培.SV波作用下岩质边坡地震稳定性的时频分析方法研究[J].岩石力学与工程学报,2013,32(3):483-491.
[5] 杨国香,伍法权,董金玉,等.地震作用下岩质边坡动力响应特性及变形破坏机制研究[J].岩石力学与工程学报,2012,31(4):696-702.
[6] 苏德斌,王浩.不同锚杆类型加固二元结构边坡的地震响应规律对比研究[J].水利与建筑工程学报,2018,16(1):40-47.
[7] 王举,杨风威,唐旭.地震荷载作用下含节理岩质边坡的破坏机理[J].水利与建筑工程学报,2017,15(5):171-177.
[8] 董金玉,杨国香,伍法权,等.地震作用下顺层岩质边坡动力响应和破坏模式大型振动台试验研究[J].岩土力学,2011,32(10):2977-2983.
[9] 王宇,贾洪彪,赵轩,等.地震作用下均质土坡动力特性的振动台试验研究[J].地震工程学报,2017,39(1):100-106.
[10] 言志信,张森,张学东,等.顺层岩质边坡地震动力响应及地震动参数影响研究[J].岩石力学与工程学报,2011,30(S2):3522-3528.
[11] 言志信,张刘平,曹小红,等.地震作用下顺层岩质边坡动力响应规律及变形机制研究[J].岩土工程学报,2011,33(S1):54-58.
[12] 滕光亮,陈永明,石玉成,等.地震作用下节理岩质边坡稳定性影响因素研究[J].地震工程学报,2013,35(1):119-125.
[13] 叶海林,郑颖人,李安洪,等.地震作用下边坡预应力锚索振动台试验研究[J].岩石力学与工程学报,2012,31(S1):2847-2854.
[14] 王泉伟,杜朋召,张涛,等.地震作用下节理岩质边坡的动力稳定性分析[J].华北水利水电大学学报(自然科学版),2015,36(6):63-67.
[15] 王海云,谢礼立.近断层强地震动的特点[J].哈尔滨工业大学学报,2006,38(12):2070-2072.
[16] 宋健,高广运.近断层速度脉冲地震动对边坡滑移的影响分析[J].岩石力学与工程学报,2014,33(2):317-326.
[17] 郑颖人,叶海林,黄润秋,等.边坡地震稳定性分析探讨[J].地震工程与工程振动,2010,30(2):173-180.
[18] Baker J W. Quantitative classification of near-fault ground motions using wavelet analysis[J]. Bulletin of the Seismological Society of America, 2007,97(5):1486-1501.DOI:10.3969/j.issn.1672-1144.2019.01.010第17卷第1期
2019年2月水利与建筑工程学报Journal of Water Resources and Architectural EngineeringVol.17 No.1Feb.,2019
[2] 李海波,肖克强,刘亚群.地震荷载作用下顺层岩质边坡安全系数分析[J].岩石力学与工程学报,2007,26(12):2385-2394.
[3] 刘丽萍,王思长.地震作用下高边坡稳定性验算及监测分析[J].水利与建筑工程学报,2015,13(1):60-64.
[4] 杨长卫,张建经,周德培.SV波作用下岩质边坡地震稳定性的时频分析方法研究[J].岩石力学与工程学报,2013,32(3):483-491.
[5] 杨国香,伍法权,董金玉,等.地震作用下岩质边坡动力响应特性及变形破坏机制研究[J].岩石力学与工程学报,2012,31(4):696-702.
[6] 苏德斌,王浩.不同锚杆类型加固二元结构边坡的地震响应规律对比研究[J].水利与建筑工程学报,2018,16(1):40-47.
[7] 王举,杨风威,唐旭.地震荷载作用下含节理岩质边坡的破坏机理[J].水利与建筑工程学报,2017,15(5):171-177.
[8] 董金玉,杨国香,伍法权,等.地震作用下顺层岩质边坡动力响应和破坏模式大型振动台试验研究[J].岩土力学,2011,32(10):2977-2983.
[9] 王宇,贾洪彪,赵轩,等.地震作用下均质土坡动力特性的振动台试验研究[J].地震工程学报,2017,39(1):100-106.
[10] 言志信,张森,张学东,等.顺层岩质边坡地震动力响应及地震动参数影响研究[J].岩石力学与工程学报,2011,30(S2):3522-3528.
[11] 言志信,张刘平,曹小红,等.地震作用下顺层岩质边坡动力响应规律及变形机制研究[J].岩土工程学报,2011,33(S1):54-58.
[12] 滕光亮,陈永明,石玉成,等.地震作用下节理岩质边坡稳定性影响因素研究[J].地震工程学报,2013,35(1):119-125.
[13] 叶海林,郑颖人,李安洪,等.地震作用下边坡预应力锚索振动台试验研究[J].岩石力学与工程学报,2012,31(S1):2847-2854.
[14] 王泉伟,杜朋召,张涛,等.地震作用下节理岩质边坡的动力稳定性分析[J].华北水利水电大学学报(自然科学版),2015,36(6):63-67.
[15] 王海云,谢礼立.近断层强地震动的特点[J].哈尔滨工业大学学报,2006,38(12):2070-2072.
[16] 宋健,高广运.近断层速度脉冲地震动对边坡滑移的影响分析[J].岩石力学与工程学报,2014,33(2):317-326.
[17] 郑颖人,叶海林,黄润秋,等.边坡地震稳定性分析探讨[J].地震工程与工程振动,2010,30(2):173-180.
[18] Baker J W. Quantitative classification of near-fault ground motions using wavelet analysis[J]. Bulletin of the Seismological Society of America, 2007,97(5):1486-1501.DOI:10.3969/j.issn.1672-1144.2019.01.010第17卷第1期
2019年2月水利与建筑工程学报Journal of Water Resources and Architectural EngineeringVol.17 No.1Feb.,2019