强震作用下岩质高边坡动力特性
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摘要
通过对快速拉格朗日法(FLAC3D法)动力分析原理进行研究,选取合理的岩质边坡动力本构模型、动力边界以及阻尼模型,建立四川震区理县至小金公路工程中豹子嘴岩质高边坡三维数值模型。在对四川"5·12"汶川8.0级大地震主震台站即理县木卡站实测地震波校正的基础上,对强地震作用下岩质高边坡的动力特性进行数值模拟分析。研究结果表明:边坡顶部位移主要以沉降模式为主,坡腰附近主要以水平位移为主,而在水平地震荷载作用下边坡呈现出明显的位移分层现象,且边坡破坏以圆弧形滑动模式为主;在强震作用下,边坡顶部较边坡底部的位移、速度以及加速度等动力响应均有竖向放大现象,且加速度放大效应较小,而速度和位移的放大效应较大,这可为震区岩质高边坡的设计及边坡加固技术的优化提供理论依据。
Based on the research of fast Lagrangian analysis of continua(FLAC3D),three-dimensional numerical model for high rock slope of Lixian—Xiaojin highway in Sichuan Province was established by adopting reasonable dynamic constitutive model,dynamic boundary and damping model.Through correcting the measured seismic wave originated from seismic station-Lixian Muka station in "5·12" Wenchuan earthquake with earthquake magnitude of 8.0 grade,the dynamic characteristics for high rock slope was studied by numerical simulation analysis.The results show that the slope roof mainly is in the form of "settlement" and slope waist is mainly in the form "horizontal displacement".Rock slope shows apparent displacement delamination and arc-shaped sliding mode for damage under horizontal earthquake action.Moreover,the dynamic response of displacement,velocity and acceleration have vertical amplification effect through contrasting between slope roof and slope foot.The amplification effect of acceleration is smaller than that of velocity and displacement.The results can provide theoretical basis for high rock slope design and reinforcement optimization.
Based on the research of fast Lagrangian analysis of continua(FLAC3D),three-dimensional numerical model for high rock slope of Lixian—Xiaojin highway in Sichuan Province was established by adopting reasonable dynamic constitutive model,dynamic boundary and damping model.Through correcting the measured seismic wave originated from seismic station-Lixian Muka station in "5·12" Wenchuan earthquake with earthquake magnitude of 8.0 grade,the dynamic characteristics for high rock slope was studied by numerical simulation analysis.The results show that the slope roof mainly is in the form of "settlement" and slope waist is mainly in the form "horizontal displacement".Rock slope shows apparent displacement delamination and arc-shaped sliding mode for damage under horizontal earthquake action.Moreover,the dynamic response of displacement,velocity and acceleration have vertical amplification effect through contrasting between slope roof and slope foot.The amplification effect of acceleration is smaller than that of velocity and displacement.The results can provide theoretical basis for high rock slope design and reinforcement optimization.
引文
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[3]Abrahamsan N A,Silva W J.Empirical response spectral attenuation relations for shallow crustal earthquake[J].Seism Res Lett,1997,68(1):94-109.
[4]Shou K J,WANG C F.Analysis of the Chiufengershan land slide triggered by the 1999 Chi-Chi earthquake in Taiwan[J].Engineering Geology,2003,68:237-250.
[5]Keefer D V.Landslides caused by earthquakes[J].Geological Society of America Bulletin,l984,95(4):406-421.
[6]黄润秋,李为乐.“5.12”汶川大地震触发地质灾害的发育分布规律研究[J].岩石力学与工程学报,2008,27(12):2585-2592.HUANG Run-qiu,LI Wei-le.Research on development and distribution rules of geohazards induced by Wenchuan Earthquake on 12th may,2008[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(12):2585-2592.
[7]张旭辉,龚晓南,徐日庆.边坡稳定影响因素敏感性的正交法计算分析[J].中国公路学报,2003,16(1):36-39.ZHANG Xu-hui,GONG Xiao-nan,XU Ri-qing.Orthogonality analysis method of sensibility on factor of slope stability[J].China Journal of Highway and Transport,2003,16(1):36-39.
[8]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):2730-2736.LIU Chun-ling,QI Sheng-wen,TONG Li-qiang,et al.Stability analysis of slope under earthquake with FLAC3D[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(16):2730-2736.
[9]宰金珉.岩土工程测试与监测技术[M].北京:中国建筑工业出版社,2008:15-25.ZAI Jin-min.Testing and monitoring technology for geotechnical engineering[M].Beijing:China Building Industry Press,2008:15-25.
[10]Kuhlemeyer R L,Lysmer J.Finite element method accuracy for wave propagation problems[J].Journal of the Soil Mechanic Sand Foundations Division,1973,99(5):421-427.
[11]Itasca Consulting Group Inc.FLAC-3D(Fast Lagrangian analysis of continua in 3 dimensions),version 2.00,users manual(VolⅤ)[Z].Minneapolis,USA:Itasca Consulting Group Inc,1997:101-128.
[12]付宏渊,吕东滨,刘建华.震区岩质边坡地震稳定性影响因素敏感性分析[J].交通科学与工程,2010,26(3):14-19.FU Hong-yuan,LüDong-bin,LIU Jian-hua.Sensitivity analysis on factors of seismic stability of rock slope in the earthquake zone[J].Journal of Transport Science and Engineering,2010,26(3):14-19.
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