顺层岩质边坡地震动力响应研究
|
摘要
地震作用下边坡的动力响应研究是边坡动力稳定分析的基础,利用FLAC3D有限差分软件建立一个顺层岩质边坡动力数值模拟模型,对其在竖向和水平向地震耦合作用下的动力响应全过程进行研究。研究表明,地震竖向和水平向耦合作用模拟比简单的模拟水平向振动更加接近实际情况,对岩土体的破坏更大;顺层岩质边坡在耦合地震作用下存在垂直放大和临空面放大作用;坡面水平向和竖向加速度均随高程增加呈增大趋势,在结构面处增大特别明显;竖向地震波产生的水平与竖向拉裂是触发斜坡体产生初期崩滑破坏的主控因素;边坡动力响应特征值的放大效应表明,其放大系数值从大到小依次是:竖向加速度>水平加速度>竖向速度>水平速度;耦合地震波作用下,随着av/aH的增大,坡面监测各点横向位移基本呈增大趋势,说明竖向地震作用起了重要的破坏作用。
The dynamic response of slopes under earthquake is the basis of slope dynamic stability research.A dynamic numerical simulation model of bedding rock slope with bolts was established by using FLAC3D program;the dynamic response under coupling vertical and horizontal seismic waves is studied.The result of numerical simulation shows that the coupling vertical and horizontal seismic waves are closer to the actual situation and make greater destruction of the rock mass.Amplifications in the vertical zoom and free surface exist in bedding rock slope under coupling effects of earthquake.With elevation increasing,the horizontal and vertical accelerations of slope increase,particularly at the structural surface.Master factors of slope body early slump destruction are horizontal and vertical crack generated by vertical seismic waves.Amplification effect of parameters in slope dynamic response shows that the amplification coefficient of vertical acceleration is larger than that of horizontal acceleration;and the vertical and horizontal velocity decreasing one by one.With the increasing of aV/aH under coupling effects of earthquake,the horizontal displacement of monitoring points increase and it proves that the vertical seismic action plays an important role in the destruction.
The dynamic response of slopes under earthquake is the basis of slope dynamic stability research.A dynamic numerical simulation model of bedding rock slope with bolts was established by using FLAC3D program;the dynamic response under coupling vertical and horizontal seismic waves is studied.The result of numerical simulation shows that the coupling vertical and horizontal seismic waves are closer to the actual situation and make greater destruction of the rock mass.Amplifications in the vertical zoom and free surface exist in bedding rock slope under coupling effects of earthquake.With elevation increasing,the horizontal and vertical accelerations of slope increase,particularly at the structural surface.Master factors of slope body early slump destruction are horizontal and vertical crack generated by vertical seismic waves.Amplification effect of parameters in slope dynamic response shows that the amplification coefficient of vertical acceleration is larger than that of horizontal acceleration;and the vertical and horizontal velocity decreasing one by one.With the increasing of aV/aH under coupling effects of earthquake,the horizontal displacement of monitoring points increase and it proves that the vertical seismic action plays an important role in the destruction.
引文
[1]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.ZHENG Ying-ren,YE Hai-lin,HUANG Run-qiu,et al.Study on the seismic stability analysis of a slope[J].Journal of Earthquake Engineering and EngineeringVibration,2010,30(2):173-180.
[2]殷跃平.汶川八级地震地质灾害研究[J].工程地质学报.2008,16(4):433-444.YIN Yue-ping.Researches on the geo-hazards triggeredby Wenchuan earthquake,Sichuan[J].Journal ofEngineering Geology,2008,16(4):433-444.
[3]徐光兴,姚令侃,李朝红,等.边坡地震动力响应规律及地震动参数影响研究[J].岩土工程学报,2008,30(6):918-923.XU Guang-xing,YAO Ling-kan,LI Zhao-hong,et al.Dynamic response of slopes under earthquakes andinfluence of ground motion parameters[J].ChineseJournal of Geotechnical Engineering,2008,30(6):918-923.
[4]林淋.竖向地震动特征分析[D].哈尔滨:中国地震局工程力学研究所,2005.
[5]翟芳鹏.地震P-S波时差耦合作用的斜坡崩滑效应研究[D].北京:中国科学院地质与地球物理研究所,2009.
[6]Itasca Consulting Group.FLAC3D Version 4.0(fastlagrangian analysis of continua in 3 dimensions)User’smanual[M].USA:Itasca Consulting Group,2009.
[7]郑颖人,赵尚毅,张鲁渝.用有限元强度折减法进行边坡稳定分析[J].中国工程科学,2002,4(10):57-62.ZHENG Ying-ren,ZHAO Shang-yi,ZHANG Lu-yu.Slope stability analysis by strength reduction FEM[J].Engineering Science,2002,4(10):57-62.
[8]祁生文,伍法权.岩质边坡动力反应[M].北京:科学出版社,2007.
[9]胡聿贤.地震工程学[M].北京:地震出版社,1988.
[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 on the dynamiccharacteristics and seismic responses of slope[J].ChineseJournal of Rock Mechanics and Engineering,2008,27(3):624-632.
[11]董金玉,杨国香.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.DONG Jin-yu,YANG Guo-xiang.The large-scaleshaking table test study of dynamic response and failuremode of bedding rock slope under earthquake[J].Rockand Soil Mechanics,2011,32(10):2977-2983.
[2]殷跃平.汶川八级地震地质灾害研究[J].工程地质学报.2008,16(4):433-444.YIN Yue-ping.Researches on the geo-hazards triggeredby Wenchuan earthquake,Sichuan[J].Journal ofEngineering Geology,2008,16(4):433-444.
[3]徐光兴,姚令侃,李朝红,等.边坡地震动力响应规律及地震动参数影响研究[J].岩土工程学报,2008,30(6):918-923.XU Guang-xing,YAO Ling-kan,LI Zhao-hong,et al.Dynamic response of slopes under earthquakes andinfluence of ground motion parameters[J].ChineseJournal of Geotechnical Engineering,2008,30(6):918-923.
[4]林淋.竖向地震动特征分析[D].哈尔滨:中国地震局工程力学研究所,2005.
[5]翟芳鹏.地震P-S波时差耦合作用的斜坡崩滑效应研究[D].北京:中国科学院地质与地球物理研究所,2009.
[6]Itasca Consulting Group.FLAC3D Version 4.0(fastlagrangian analysis of continua in 3 dimensions)User’smanual[M].USA:Itasca Consulting Group,2009.
[7]郑颖人,赵尚毅,张鲁渝.用有限元强度折减法进行边坡稳定分析[J].中国工程科学,2002,4(10):57-62.ZHENG Ying-ren,ZHAO Shang-yi,ZHANG Lu-yu.Slope stability analysis by strength reduction FEM[J].Engineering Science,2002,4(10):57-62.
[8]祁生文,伍法权.岩质边坡动力反应[M].北京:科学出版社,2007.
[9]胡聿贤.地震工程学[M].北京:地震出版社,1988.
[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 on the dynamiccharacteristics and seismic responses of slope[J].ChineseJournal of Rock Mechanics and Engineering,2008,27(3):624-632.
[11]董金玉,杨国香.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.DONG Jin-yu,YANG Guo-xiang.The large-scaleshaking table test study of dynamic response and failuremode of bedding rock slope under earthquake[J].Rockand Soil Mechanics,2011,32(10):2977-2983.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心