陡倾层状岩质边坡动力响应大型振动台模型试验研究
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
结合5.12汶川地震诱发的大量次生地质灾害,设计并完成了比例为1:100的边坡大型振动台模型试验,讨论了相似关系和模型的设计、传感器的布置、模型的建造过程,编制了动荷载加载制度。试验结果表明,边坡对输入动荷载具有放大作用,沿坡面向上,PGA放大系数呈上升趋势,并具有一定的节律性,其节律性变化规律受坡体岩性、结构面组合和动荷载振动方向的影响;动荷载X向振动时的坡面峰值重力加速度(PGA)放大系数明显大于Z向振动时的坡面PGA放大系数,说明坡体在X向振动时的动力响应更为强烈;坡体内PGA放大系数在铅直向上呈线性放大,在水平向上表现为节律性变化。试验结果有助于了解陡倾层状岩质边坡在不同动荷载作用下的响应规律,对研究其变形失稳机制和抗震结构设计提供了依据。
This paper is based on a large number of secondary geological disasters induced by the Wenchuan Earthquake.It designs and completes a large-scale shaking table model test of slopes with the scale of 1: 100.It discusses the design of similarity relation and the model,sensor layout,process of model construction as well as the seismic wave loading system.The results show that the model slopes have amplification effect to the input dynamic load.Upward along with the slope surfaces,the PGA amplification coefficients have a rise tendency and some rhythmic.The variation law of rhythmic is affected by the lithology of slopes,combination of structural surface and vibration direction of the dynamic loads.Coefficients of the PGA amplification along surface of slopes are significantly greater for the vibration direction of dynamic load to horizontal(X)than for the direction of dynamic load to vertical(Z),which shows that the dynamic response of slopes is stronger when the vibration direction X.The PGA amplification coefficients in the vertical direction of the slope body are amplified linearly.They in the horizontal direction change in rhythm.The results can help to understand the dynamic response rules of steep stratified rock slopes in the effect of different kinds of dynamic loads,and provide a basis to study the mechanism of deformation and instability of slopes under earthquake and the design of anti-earthquake structure.
引文
[1]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 sha-king table model test study on dynamic characteristics and dynamicresponses of slope.Chinese Journal of Rock Mechanics and Engi-neering,2008,27(3):624~632.
    [2]肖锐铧,许强,冯文凯,等.强震条件下双面坡变形破坏机理的振动台物理模拟试验研究[J].工程地质学报,2010,18(6):837~843.Xiao Ruihua,Xu Qiang,Feng Wenkai,et al.Shaking table simula-tion experiment on deformation failure mechanism of double sidesslope in condition of intense earthquake.Journal of EngineeringGeology,2010,18(6):837~843.
    [3]许强,陈建君,冯文凯,等.斜坡地震响应的物理模拟试验研究[J].四川大学学报(工程科学版),2009,41(3):266~272.Xu Qiang,Chen Jianjun,Feng Wenkai,et al.Study of the seismicresponse of slopes by physical modeling.Journal of Sichuan Univer-sity(Engineering Science),2009,41(3):266~272.
    [4]梁庆国,韩文峰,马润勇,等.强地震动作用下层状岩体破坏的物理模拟研究[J].岩土力学,2005,26(8):1307~1311.Liang Qingguo,Han Wenfeng,Ma Runyong,et al.Physical simula-tion study on dynamic failures of layered rock masses under strongground motion.Rock and Soil Mechanics,2005,26(8):1307~1311.
    [5]于玉贞,邓丽军,等.砂土边坡地震动力响应离心模型试验[J].清华大学学报(自然科学版),2007,47(6):789~792.Yu Yuzhen,Deng Lijun,et al.Centrifuge model test of the seismicresponse behavior of a sand slope.Journal of Tsinghua University(Science and Technology,2007,47(6):789~792.
    [6]李育枢,李天斌,等.黄草坪2#隧道洞口段减震措施的大型振动台模型试验研究[J].岩石力学与工程学报,2009,28(6):1128~1136.Li Yushu,Li Tianbin,et al.Large-scale shaking table test for vibra-tion-absorption measures of portal section of Huangcaoping tunnelNo.2.Chinese Journal of Rock Mechanics and Engineering,2009,28(6):1128~1136.
    [7]沈建,陈新民,魏平,等.土质边坡地震稳定性动力模型试验研究综述[J].工业建筑,2010,40(S1):625~628.Shen Jian,Chen Xinmin,Wei Ping,et al.Review on the dynamicmodel tests of seismic stability of soil slopes.Industrial Construc-tion,2010,40(S1):625~628.
    [8]许强,刘汉香,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):2420~2428.Xu Qiang,Liu Hanxiang,et al.Large-scale shaking table test studyof acceleration dynamic responses characteristics of slopes.ChineseJournal of Rock Mechanics and Engineering,2010,29(12):2420~2428.
    [9]蒋树屏,蒋华,王晓雯,等.高烈度地震区公路隧道洞口段大型振动台模型试验方案设计[J].公路,2009,(10):245~249.Jiang Shuping,Jiang Hua,Wang Xiaowen,et al.Design test schemeof large scale shaking table model for tunnel outlet of highway tun-nel in seismic region with strong motion.Highway,2009,(10):245~249.
    [10]祁生文,伍法权,等.岩质边坡动力反应分析[M].北京:科学出版社,2007.Qi Shengwen,Wu Faquan,et al.Rock Slope Dynamic ResponseAnalysis.Beijing:Science Press,1987.
    [11]石崇,周家文,仁强,等.单面边坡高程放大效应的射线理论解[J].河海大学学报(自然科学版),2008,36(2):238~241.Shi Chong,Zhou Jiawen,Ren Qiang,et al.Ray theory solution ofthe elevation amplification effect on a single-free-face slope.Jour-nal of Hohai University(Natural Science),2008,36(2):238~241.
    [12]许强,黄润秋.5.12汶川大地震诱发大型崩滑灾害动力特征初探[J].工程地质学报,2008,16(6):721~729.Xu Qiang,Huang Runqiu.Kinetics charateristics of large land-slides triggered by May 12th Wenchuan earthquake.Journal ofEngineering Geology,2008,16(6):721~729.
    [13]张菊明,王思敬.层状边坡岩体滑动稳定的三维动力学分析[J].工程地质学报,1994,2(3):1~12.Zhang Juming,Wang Sijing.3-D dynamic analysis of rock slidingon the layered rock slope.Journal of Engineering Geology,1994,2(3):1~12.
    [14]陶连金,苏生瑞,张悼元,等.节理岩体边坡的动力稳定性分析[J].工程地质学报,2001,9(1):32~38.Tao Lianjin,Su Shengrui,Zhang Zhuoyuan,et al.Dynamic stabili-ty analysis of jointed rock slope.Journal of Engineering Geology,2001,9(1):32~38.

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