纵波作用下边坡动力响应规律研究
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摘要
地震工程的观点认为水平地震力是引起岩土体破坏的决定性因素,竖向地震力的影响则微不足道。鉴于汶川地震中表现出竖向地震力对边坡和建筑造成极大破坏,本文利用FLAC软件对不同坡高、坡角的边坡在不同周期、振幅的纵波作用下边坡动力响应规律做了数值模拟研究。结果表明:坡高较低时,振动加速度在1/2坡高以下范围内随高程逐渐增大,1/2坡高以上则保持不变,当坡高增大时,振动加速度变化出现律动性,坡顶附近较其他部位存在明显的放大;坡角的增大会造成振动加速度放大幅度的增大;振动加速度随动力振幅的增大而增大,并呈明显的线性关系;振动加速度随地震波周期的增大逐渐减小。
In the viewpoint of seismic engineering,the horizontal seismic force is the decisive factor that leads to rock-soil mass destruction,while the vertical seismic forces are negligible.In view of huge destruction of the slopes and constructions caused by vertical seismic force in Wenchuan Earthquake,this paper conducted a numerical simulation research on the horizontal and vertical response law of the vertical acceleration in the slope with different heights and slope angle under the influence of the P-wave with different cycles and amplitude by use of FLAC finite difference software.The results showed that when the slope height is low,the acceleration,less than half of the slope height,increases with the height,while more than half of the slope height,it remains unchanged.When the slope height increases,the acceleration changes with a regularity,and the acceleration in the peak of the slope is bigger than any other parts in the slope.The bigger the slope angle and the greater the vibration acceleration enlargement ranges.The vibration acceleration increases as the amplitude increases.They have significant linear relations.The vibration acceleration on the slope increases as the cycle gradually decreases.
In the viewpoint of seismic engineering,the horizontal seismic force is the decisive factor that leads to rock-soil mass destruction,while the vertical seismic forces are negligible.In view of huge destruction of the slopes and constructions caused by vertical seismic force in Wenchuan Earthquake,this paper conducted a numerical simulation research on the horizontal and vertical response law of the vertical acceleration in the slope with different heights and slope angle under the influence of the P-wave with different cycles and amplitude by use of FLAC finite difference software.The results showed that when the slope height is low,the acceleration,less than half of the slope height,increases with the height,while more than half of the slope height,it remains unchanged.When the slope height increases,the acceleration changes with a regularity,and the acceleration in the peak of the slope is bigger than any other parts in the slope.The bigger the slope angle and the greater the vibration acceleration enlargement ranges.The vibration acceleration increases as the amplitude increases.They have significant linear relations.The vibration acceleration on the slope increases as the cycle gradually decreases.
引文
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[8]梁庆国,韩文峰,赵士耀.垂直向地震作用对节理岩体失稳破坏的影响[J],西北地震学报,2007,26(4):307～313.Liang Qingguo,Han Wenfeng,Zhao Shiyao.Influence of Vertical Seismic Action on Seismic Dynamic Failure of Jointed Rock Mass,Northwestern Seismological Journal,2007,26(4):307～313.
[9]侯超群,王晓谋,石恒俊.地震对边坡稳定性影响分析[J].路基工程,2008,6,187～188.Hou Chaoqun,Wang Xiaomou,Shi Henjun.Subgrade Engineer-ing,2008,6,187～188.
[10]何蕴龙,陆述远.岩石边坡地震作用近似计算方法[J].岩土工程学报,1998,20(2):66～68.He Yunlong,Lu Shuyua.A method for calculating the seismic ac-tion in rock slope.Chinese Journal of Geotechnical Engineering,1998,20(2):66～68.
[11]祁生文.边坡动力响应规律研究[J].中国科学E辑技术科学,2003,33(增刊):28～40.Qi Shengwen,Wu Faquan.Science in China Series E,2003,33(sup):28～40.
[12]徐光兴,姚令侃,李朝红,高召宁.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,Gao Zhaoning.Dynam-ic response of slopes under earthquakes and influence of ground motion parameters,Journal of Geotechnical Engineering,2008,30(6):918～923.
[2]尹紫红.地震作用下的高速公路滑坡稳定性分析[J].重庆工学院学报(自然科学版),2007,21(9):92～95.Yin Zihong.Analysis on the Stability of Superhighway Landslide in Earthquakes.Journal of Chongqing Institute of Technology(Natural Science Edition),2007,21(9):92～95.
[3]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.Huang Runqiu.Mechanism and Geomechanical Modes of Land-slide Hazards Triggered by Wenchuan8.0Earhquake Chinese Journal of Rock Mechanics and Engineering,2009,28(6):1239～1249.
[4]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 Characteristics of Large Land-slide Triggered by Wenchuan Earthquake.Journal of Engineering Geology,2008,16(6):721～729.
[5]殷跃平.汶川八级地震地质灾害研究[J].工程地质学报,2008,6(24):433～444.Yin Yueping.Researches on the geo-hazards triggered by Wen-chuan Earthquake,Sichuan.Journal of Engineering Geology,2008,16(24):433～444.
[6]非明伦,樊跃新,崔建文,包一峰,陈坤华,卢吉高.施甸5.9级地震震害与竖向地震力作用[J].地震研究,2003,26(3):292～298.Fei,Minglun,Fan Yuexin,Cui Jianwen,Bao Yifeng,Chen,Kun-hua,Lu,Jigao.Earthquake Dam agesfor M5.9Shidian Earthquake and Vertical Earthquake Force Function.Journal of Lseismologica researc,2003,26(3):292～298.
[7]胡晓燕,周健,胡晓虎.地震引起的竖向力对地铁隧道的影响[J].工程抗震,2006,(2):32～35.Hu Xiaoyan,Zhou Jian,Hu xiaohu.The Influence of Vertical Stress Induced by Earthquake to the Subway Tunnel.Earthquake resist-ant engineering,2006,(2):32～35.
[8]梁庆国,韩文峰,赵士耀.垂直向地震作用对节理岩体失稳破坏的影响[J],西北地震学报,2007,26(4):307～313.Liang Qingguo,Han Wenfeng,Zhao Shiyao.Influence of Vertical Seismic Action on Seismic Dynamic Failure of Jointed Rock Mass,Northwestern Seismological Journal,2007,26(4):307～313.
[9]侯超群,王晓谋,石恒俊.地震对边坡稳定性影响分析[J].路基工程,2008,6,187～188.Hou Chaoqun,Wang Xiaomou,Shi Henjun.Subgrade Engineer-ing,2008,6,187～188.
[10]何蕴龙,陆述远.岩石边坡地震作用近似计算方法[J].岩土工程学报,1998,20(2):66～68.He Yunlong,Lu Shuyua.A method for calculating the seismic ac-tion in rock slope.Chinese Journal of Geotechnical Engineering,1998,20(2):66～68.
[11]祁生文.边坡动力响应规律研究[J].中国科学E辑技术科学,2003,33(增刊):28～40.Qi Shengwen,Wu Faquan.Science in China Series E,2003,33(sup):28～40.
[12]徐光兴,姚令侃,李朝红,高召宁.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,Gao Zhaoning.Dynam-ic response of slopes under earthquakes and influence of ground motion parameters,Journal of Geotechnical Engineering,2008,30(6):918～923.
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