不同边界和地基条件的大型滑坡体动力响应分析
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摘要
动力有限元计算结果的真实性与模型边界条件的设置和地震波输入高程的选择有着密切的关系。采用动力有限元时程分析法对不同边界和地基条件的大型滑坡体进行了数值计算,在此基础上分析了地基辐射阻尼和地震加速度输入高程对滑坡体动力响应的影响,以及大型滑坡体的地震响应规律。结果表明,上田镇大型滑坡体在动力作用下上部的位移响应值大,剪应力小,而下部则相反;黏弹性边界能有效地降低滑坡体的地震反应,而且地震输入高程的不同对滑坡体的地震响应会产生相当大的影响,地基辐射阻尼和地震波输入的模拟合理性直接影响滑坡体动力分析的客观性。
The authenticity of dynamic finite element's results has a close relationship not only with boundary condition and the inputted datum of seismic wave.This paper calculates seismic response of large slipmass under different boundary conditions and inputted datum with time history method.On the basis of the calculating results to analyze the impacts which arise from radiation damping and inputted elevation on seismic response of slipmass and the law of seismic response.The results demonstrate that the upper part of Shangtian-town large slipmass has large displacement response and small shearing strength;but the response of lower part is opposite to the upper.Viscoelastic boundary can reduce the seismic response of slipmass;and the change of inputted elevation of earthquake wave can produce considerable influence on seismic response.The simulative rationality of radiation damping of foundation and inputted elevation of earthquake wave can influence the objectivity of seismic analysis.
The authenticity of dynamic finite element's results has a close relationship not only with boundary condition and the inputted datum of seismic wave.This paper calculates seismic response of large slipmass under different boundary conditions and inputted datum with time history method.On the basis of the calculating results to analyze the impacts which arise from radiation damping and inputted elevation on seismic response of slipmass and the law of seismic response.The results demonstrate that the upper part of Shangtian-town large slipmass has large displacement response and small shearing strength;but the response of lower part is opposite to the upper.Viscoelastic boundary can reduce the seismic response of slipmass;and the change of inputted elevation of earthquake wave can produce considerable influence on seismic response.The simulative rationality of radiation damping of foundation and inputted elevation of earthquake wave can influence the objectivity of seismic analysis.
引文
[1]吴圣林.崩塌一推覆滑移地质体成因机理及其稳定性研究[D].徐州:中国矿业大学,2008.
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[3]孟晖,胡海涛.我国主要人类工程活动引起的滑坡、崩塌和泥石流灾害[J].工程地质学报,1996,4(4):70-74.MENG Hui,HU Hai-tao.Disaster of lanslides,rockfalls,and mudflows induced by human engineering in China[J].Journal of Engineering Geology,1996,4(4):70-74.
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[5]郑颖人,叶海林,黄润秋.地震边坡破坏机制及其破裂面的分析探讨[J].岩石力学与工程学报,2009,28(8):1714-1723.ZHENG Ying-ren,YE Hai-lin,HUANG Run-qiu.Analysis and discussion of failure mechanism andfracture surface of slope under earthquake[J].ChineseJournal of Rock Mechanics and Engineering,2009,28(8):1714-1723.
[6]陈厚群.坝址地震动输入机制探讨[J].水利学报,2006,37(12):1417-1423.CHEN Hou-qun.Discussion on seismic input mechanismat dam site[J].Journal of Hydraulic Engineering,2006,37(12):1417-1423.
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[9]秋仁东,石玉成,付长华.高边坡在水平动荷载作用下的动力响应规律研究[J].世界地震工程,2007,23(2):131-138.QIU Ren-dong,SHI Yu-cheng,FU Chang-hua.Generallaws of dynamic responses of the high slopes underhorizontal dynamic input[J].World EarthquakeEngineering,2007,23(2):131-138.
[10]王环玲,徐卫亚.高烈度区水电工程岩石高边坡三维地震动力响应分析[J].岩石力学与工程学报,2005,24(2):5890-5895.WANG Huan-ling,XU Wei-ya.3D dynamical responseanalysis of high rock slope related to hydropower project inhigh intensive seismic region[J].Chinese Journal of RockMechanics and Engineering,2005,24(2):5890-5895.
[11]言志信,张森,张学东,等.地震边坡失稳机理及稳定性分析[J].工程地质学报,2010,18(8):844-850.YAN Zhi-xin,ZHANG Sen,ZHANG Xue-dong,et al.Failure mechanism and stability analysis of slope underearthquake[J].Journal of Engineering Geology,2010,18(8):844-850.
[12]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):624-622.XU Guang-xing,YAO Ling-kan,GAO Zhao-ning,et al.Large-scale haking table model test study of dynamiccharacteristics and dynamic responses of slope[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(3):624-622.
[2]文海家,张永兴.山区建设场地高切坡稳定性评估概要[J].地下空间,2002,22(4):299-302.WEN Hai-jia,ZHANG Yong-xing.Summary on stabilityassessment for man-excavated high slope adjacent tobuilding site in mountain areas[J].Underground Space,2002,22(4):299-302.
[3]孟晖,胡海涛.我国主要人类工程活动引起的滑坡、崩塌和泥石流灾害[J].工程地质学报,1996,4(4):70-74.MENG Hui,HU Hai-tao.Disaster of lanslides,rockfalls,and mudflows induced by human engineering in China[J].Journal of Engineering Geology,1996,4(4):70-74.
[4]晏志勇,王斌,周建平,等.汶川地震灾区大中型水电工程震损调查与分析[M].北京:中国水利水电出版社,2009.
[5]郑颖人,叶海林,黄润秋.地震边坡破坏机制及其破裂面的分析探讨[J].岩石力学与工程学报,2009,28(8):1714-1723.ZHENG Ying-ren,YE Hai-lin,HUANG Run-qiu.Analysis and discussion of failure mechanism andfracture surface of slope under earthquake[J].ChineseJournal of Rock Mechanics and Engineering,2009,28(8):1714-1723.
[6]陈厚群.坝址地震动输入机制探讨[J].水利学报,2006,37(12):1417-1423.CHEN Hou-qun.Discussion on seismic input mechanismat dam site[J].Journal of Hydraulic Engineering,2006,37(12):1417-1423.
[7]中国水利水电科学研究院.DL5073-2000水工建筑物抗震设计规范[S].北京:中国电力出版社,2000.
[8]黄诚,王安明,任伟中.水平向与竖向地震动的时间遇合模式对边坡动力安全系数的影响[J].岩土力学,2010,31(11):3404-3410.HUANG Cheng,WANG An-ming,REN Wei-zhong.Influence of time combination pattern of horizontal andvertical ground motions on slope seismic safety factor[J].Rock and Soil Mechanics,2010,31(11):3404-3410.
[9]秋仁东,石玉成,付长华.高边坡在水平动荷载作用下的动力响应规律研究[J].世界地震工程,2007,23(2):131-138.QIU Ren-dong,SHI Yu-cheng,FU Chang-hua.Generallaws of dynamic responses of the high slopes underhorizontal dynamic input[J].World EarthquakeEngineering,2007,23(2):131-138.
[10]王环玲,徐卫亚.高烈度区水电工程岩石高边坡三维地震动力响应分析[J].岩石力学与工程学报,2005,24(2):5890-5895.WANG Huan-ling,XU Wei-ya.3D dynamical responseanalysis of high rock slope related to hydropower project inhigh intensive seismic region[J].Chinese Journal of RockMechanics and Engineering,2005,24(2):5890-5895.
[11]言志信,张森,张学东,等.地震边坡失稳机理及稳定性分析[J].工程地质学报,2010,18(8):844-850.YAN Zhi-xin,ZHANG Sen,ZHANG Xue-dong,et al.Failure mechanism and stability analysis of slope underearthquake[J].Journal of Engineering Geology,2010,18(8):844-850.
[12]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):624-622.XU Guang-xing,YAO Ling-kan,GAO Zhao-ning,et al.Large-scale haking table model test study of dynamiccharacteristics and dynamic responses of slope[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(3):624-622.
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