岩质边坡稳定性数值模拟及动力响应分析
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摘要
采用快速拉格朗日方法,以差分技术引入时间因素实现了从连续介质小变形到大变形的分析模拟,对湖南省对口援建项目—四川理县至小金公路工程中豹子嘴边坡建立了三维模型,并采用2008年5.12汶川M8.0级地震中木卡站实测的地震波,在对地震波进行校正的基础上,进行动力数值模拟,分析了地震荷载作用下岩质边坡的位移、加速度和速度的动力响应过程和规律。岩质边坡动力响应分析表明地震荷载下岩质边坡最小水平永久位移、最小水平加速度反应峰值及最小水平速度反应峰值均发生在坡脚处,且在竖向方向均存在较明显的放大效应,其位移、加速度和速度的放大效应存在一定差异,放大倍数分别为18,1.3和6.35。
Based on the fast lagrangian finite-difference method,the numerical simulation analysis on a small deformation of continuous medium to large deformation was achieved by differential technology taken the time factor into account.A three-dimensional model was established on the Baozizui slope in the Xiaojin-Li County Sichuan highway which was the counterparts on reconstruction projects of Hunan Province.And the dynamic numerical analysis of the slope was simulated by the seismic waves observed in Muka station during the Wenchuan 5·12 M8.0 earthquakes in 2008,based on the correction of seismic wave.The displacement,acceleration and speed dynamic response regularity of rock slope were analyzed under the seismic loads.The results showed that the minimum horizontal permanent displacement,the minimum response peak of horizontal acceleration and the minimum response peak of horizontal speed were occurred at the rock slope foot under seismic loading,and in the vertical direction there were obvious displacement amplification effect in which there exist differences in the amplifying effect of displacement,acceleration and speed whose magnification ratio was 18,1.3 and 6.35,respectively.
Based on the fast lagrangian finite-difference method,the numerical simulation analysis on a small deformation of continuous medium to large deformation was achieved by differential technology taken the time factor into account.A three-dimensional model was established on the Baozizui slope in the Xiaojin-Li County Sichuan highway which was the counterparts on reconstruction projects of Hunan Province.And the dynamic numerical analysis of the slope was simulated by the seismic waves observed in Muka station during the Wenchuan 5·12 M8.0 earthquakes in 2008,based on the correction of seismic wave.The displacement,acceleration and speed dynamic response regularity of rock slope were analyzed under the seismic loads.The results showed that the minimum horizontal permanent displacement,the minimum response peak of horizontal acceleration and the minimum response peak of horizontal speed were occurred at the rock slope foot under seismic loading,and in the vertical direction there were obvious displacement amplification effect in which there exist differences in the amplifying effect of displacement,acceleration and speed whose magnification ratio was 18,1.3 and 6.35,respectively.
引文
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[2]李宁,程国栋,谢定义.西部大开发中的岩土力学问题[J].岩土工程学报,2001,23(3):268-272.
[3]李海波,蒋会军,赵坚,等.动荷载作用下岩体工程安全的几个问题[J].岩石力学与工程学报,2003,22(11):1887-1891.
[4]黄润秋.汶川8.0级地震触发崩滑灾害机制及其地质力学模式[J].岩石力学与工程学报,2009,28(6):1239-1249.
[5]陈玲玲,陈敏中,钱胜国.岩质陡高边坡地震动力稳定分析[J].长江科学院院报,2004,21(1):33-35.
[6]刘春玲,祁生文,童立强,等.利用FLAC3D分析某边坡地震稳定性[J].岩石力学与工程学报,2004,23(16):2730-2733.
[7]Seed H B,Lee K L,Idriss I M,et al.Analysis of the slides inthe San Fernando dams during the earthquake of Feb.9,1971[R].Berkeley:EERC,University of California,1973.
[8]刘立平,雷尊宇,周富春.地震边坡稳定分析方法综述[J].重庆交通学院学报,2001,20(3):83-88.
[9]陈云敏,柯瀚,凌道盛.城市垃圾填埋体的动力特性及地震响应[J].土木工程学报,2002,35(3):66-72.
[10]Itasca Consulting Group Inc.FLAC-3D(Fast Lagrangian A-nalysis of Continua in 3 Dimensions),Version 2.00,UsersManual(Vol.V)[R].USA:Itasca Consulting Group Inc,1997.
[11]Kuhlemeyer R L,Lysmer J.Finite element method accuracyfor wave propagation problems[J].Journal of the Soil Me-chanic sand Foundations Division,ASCE,1973,99(5):421-427.
[12]Wilson R C.and Keefer D K.A real limits of earthquake-induced Landsliding[A].In:Evaluating Earthquake Hazardsin the Los Angeles Region[C].[s.l.],U.S.Geol.Sur.Press,1985,316-345.
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