基于理想坡面形态的三维边坡地震动力三量分布
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摘要
为了讨论边坡坡面形态对地震边坡加速度、速度以及位移分布规律的影响,将边坡按坡面形态分为凹面坡以及凸面坡,并引入底面角的概念表述了坡面的凹凸强烈程度。通过三维数值建模,利用动力有限元计算方法计算了不同坡形和底面角对三量分布的影响。研究结果表明:在同一水平高度,其放大系数在凹面坡和凸面坡坡面中心达到最大值,并且向两侧逐渐减小,放大系数随着坡底角的增大而增大;同时,边坡坡面形态对边坡内部的三量分布影响较小,但其分布随着坡高的增高而增大。
In order to investigate the influence of slope surface shape on distribution patterns of acceleration,velocity and displacement of seismic slope,according to the slope surface morphology,the slope was divided into concave slope and convex slope,and the concept of underside angle was introduced to express the unevenness degree.By 3D numerical modeling,the influence of different slope surface shapes and underside angles on the three-quantity distribution was calculated by using dynamic finite element method.The research result indicates that(1) at the same height,the amplification factor at the center of concave slope and convex slope attends to the maximum and decreases gradually to both sides,the amplification factor increases with the increases of underside angle;(2) the influence of slope surface shape on the three-quantity distribution inside the slope is less,but the distribution scope increases with the increases if slope height.
In order to investigate the influence of slope surface shape on distribution patterns of acceleration,velocity and displacement of seismic slope,according to the slope surface morphology,the slope was divided into concave slope and convex slope,and the concept of underside angle was introduced to express the unevenness degree.By 3D numerical modeling,the influence of different slope surface shapes and underside angles on the three-quantity distribution was calculated by using dynamic finite element method.The research result indicates that(1) at the same height,the amplification factor at the center of concave slope and convex slope attends to the maximum and decreases gradually to both sides,the amplification factor increases with the increases of underside angle;(2) the influence of slope surface shape on the three-quantity distribution inside the slope is less,but the distribution scope increases with the increases if slope height.
引文
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[3]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 Guangxing,YAO Lingkan,GAO Zhaoning,et al.Large-scale Shaking Table Model Test Study on Dynamic Characteristics and Responses of Slope[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(3):624-632.
[4]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 Guangxing,YAO Lingkan,LI Zhaohong,et al.Dynamic Response of Slopes under Earthquakes and Influence of Ground Motion Parameters[J].Chinese Journal of Geotechnical Engineering,2008,30(6):918-923.
[5]LIN M L,WANG K L.Seismic Slope Behavior in a Large Scale Shaking Table Model Test[J].Engineering Geology,2006,86(2):118-133.
[6]许强,刘汉香,邹威,等.斜坡加速度动力响应特性的大型振动台试验研究[J].岩石力学与工程学报,2010,29(12):2420-2429.XU Qiang,LIU Hanxiang,ZOU Wei,et al.Large-scale Shaking Table Test Study of Acceleration Dynamic Responses Characteristics of Slopes[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(12):2420-2429.
[7]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模型试验研究[J].岩土力学,2011,32(10):2977-2983.DONG Jinyu,YANG Guoxiang,WU Faquan,et al.The Large-scale Shaking Table Test Study of Dynamic Response and Failure Mode of Bedding Rock Slope under Earthquake[J].Rock and Soil Mechanics,2011,32(10):29772983.
[8]张学东,言志信,张森.ANSYS在岩质边坡动力响应分析中的应用[J].西北地震学报,2010,32(2):117-121.ZHANG Xuedong,YAN Zhixin,ZHANG Sen.Numerical Analysis on Dynamic Response of Rock Slope Using ANSYS Software[J].Northwestern Seismological Journal,2010,32(2):117-121.
[9]祁生文.单面边坡的两种动力反应形式及其临界高度[J].地球物理学报,2006,49(2):518-523.QI Shengwen.Two Patterns of Dynamic Responses of Single-free-surface Slopes and Their Threshold Height[J].Chinese Journal of Geophysics,2006,49(2):518-523
[10]PARISH Y,SADEK M,SHAHROUR I.Review Article:Numerical Analysis of the Seismic Behaviour of Earth Dam[J].Natural Hazards and Earth System Sciences,2009(9):451-458.
[11]Itasca Consulting Group Inc.FLAC-3D Fast Lagranian Analysis of Continua in3Dimensions[R].ver.2.0.Minneapolis,USA:Itasca Consulting Group,Inc,1997.
[12]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):2585-2591.HUANG Runqiu,LI Weile.Research on Developmentand Distribution Rules of Geohazards Induced by Wenchuan Earthquake on12th May,2008[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(12):2585-2591.
[13]张立,付宏渊,付康林,等.汶川地震诱发边坡动力失稳影响因素分析[J].公路交通科技,2011,28(4):12-18.ZHANG Li,FU Hongyuan,FU Kanglin,et al.Analysis on Influencing Factors of Slope Dynamic Stability Induced by Wenchuan Earthquake[J].Journal of Highway and Transportation Research and Development,2011,28(4):12-18.
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