边坡地震响应的动力有限元分析
|
摘要
边坡的地震响应是一个复杂的命题,也是近年来的的热点,尤其是"5.12"地震以后。目前,动力有限元是解决边坡地震响应问题行之有效的方法之一,它以地震时程加速度作为反映地震荷载的主要因素,能够定量地反映出地震时程加速对边坡不同的应力场、位移场、运动速度的影响。以某水电站坝前一个受"5.12"地震所诱发复活的巨型滑坡为例,运用动力有限元软件,对该滑坡进行了地震荷载作用下的响应分析,计算得出了地震作用下该滑坡产生的水平垂直动位移、加速度、最大剪应力场。最后,图示说明了滑坡在地震作用下的往复振动对其稳定性的影响,得到了该滑坡的安全系数时程曲线,各项计算结果量值与地震后滑坡实际量值一致,这表明"5.12"地震是导致该古滑坡复活的直接原因。
The seismic response of landslide is a complicated proposition, and it’s also the hot spot in recent years, especially after the "5.12" Earthquake. At present, the dynamic finite element is one of an effective way to solve the dynamic response problem of landslide. In the dynamic finite element, earthquake acceleration is the major factor which reflects the seismic loading, and the impacts of the earthquake on the stress field, displacement field and velocity of the landslide. By using a giant landslide in front of some hydropower dam as an example which was induced by the "5.12" earthquake, the seismic response analysis of the landslide has been done by a dynamic finite element software, with which the displacement acceleration and the maximum shear stress of the seismic response of the slope have been calculated. Then the status of the reciprocating vibration on the impact of the stability of landslide is illustrated. Finally, the safety factor duration curve of the landslide is got, the calculated results are consistent with the actual displacement of the landslide after the earthquake, it shows that the "5.12" Earthquake is the direct factor inducing the ancient landslide resurrection.
The seismic response of landslide is a complicated proposition, and it’s also the hot spot in recent years, especially after the "5.12" Earthquake. At present, the dynamic finite element is one of an effective way to solve the dynamic response problem of landslide. In the dynamic finite element, earthquake acceleration is the major factor which reflects the seismic loading, and the impacts of the earthquake on the stress field, displacement field and velocity of the landslide. By using a giant landslide in front of some hydropower dam as an example which was induced by the "5.12" earthquake, the seismic response analysis of the landslide has been done by a dynamic finite element software, with which the displacement acceleration and the maximum shear stress of the seismic response of the slope have been calculated. Then the status of the reciprocating vibration on the impact of the stability of landslide is illustrated. Finally, the safety factor duration curve of the landslide is got, the calculated results are consistent with the actual displacement of the landslide after the earthquake, it shows that the "5.12" Earthquake is the direct factor inducing the ancient landslide resurrection.
引文
[1]祁生文,伍法权,严福章,等.岩质边坡动力反应分析[M].北京:科学出版社,2007.(QI Wen-sheng,WU Fa-quan,YAN Fu-zhang,et al.Rock Slope Dynamic Re-sponse Analysis[M].Beijing:Science Press,2007.(in Chinese))
[2]鲍叶静,高孟潭.地震诱发滑坡的概率分析[J].岩石力学与工程学报,2005,24(1):66-71.(BAO Ye-jing,GAO Meng-tan,JIANG Hui.Probabilistic analysis of earthquake-induced landslides[J].Rock Mechanics and Engineering,2005,24(1):66-71.(in Chinese))
[3]万永革.地震物理过程模拟研究[D].北京:中国地震局地质研究所,2006.(WAN Yong-ge.Modeling on physical processes of earthquakes[D].Beijing:Institute of Geology,China Earthquake Administration,2006.(in Chinese))
[4]徐桂弘.地震诱发滑坡的危险性分析与预测[J].内陆地震,2008,22(2):188-192.(XUGui-hong.Anal-ysis and prediction of danger of landslide caused earth-quakes[J].Inland Earthquake,2008,22(2):188-192.(in Chinese))
[5]朱大栋.复杂岩质边坡的静动力稳定性分析[D].南京:河海大学,2007.(ZHU Da-dong.Study on compli-cated rock slopes of static and dynamic stability[D].Nanjing:Hohai University,2007.(in Chinese))
[6]李忠生.地震作用下滑坡稳定性分析[J].水文地质工程地质,2004,(2):4-8.(LI Zhong-sheng.Land-slide stability analysis under seismic ground motion[J].Hydrogeology and Engineering Geology,2004,(2):4-8.(in Chinese))
[7]朱学贤.岩石高边坡爆破开挖安全评价[D].武汉:长江科学院,2007.(ZHUXue-xian.Safety analysis on the dynamic stability of high rock slope induced by blasting vibration[D].Wuhan:Yangtze River Scientific Re-search Institute,2007.(in Chinese))
[8]张倬元,王士天,王兰生.工程地质分析原理[M].北京:地质出版社,1994.(ZHANG Zuo-Yuan,WANG Shi-tian,WANG Lan-sheng.Engineering Geology Theory Analyse[M].Beijing:Geology Press,1994.(in Chi-nese))
[9]陈昌凯.地震作用下边坡的有限元动力模拟[D].昆明:昆明理工大学,2006.(CHEN Chan-kai.Infinite element simulation on dynamic responses of slope underearthquake load[D].Kunming:Kunming University of Science and Technology,2006.(in Chinese))
[10]刘春玲,祁生文.利用FLAC3D分析某边坡稳定性[J].岩石力学与工程学报,2004,23(16):2730-2733.(LIU Chun-ling,QI Sheng-wen.Stability analysis of slope under earthquake with FLAC3D[J].Chinese Journalof Rock Mechanics and Engineering,2004,23(16):2730-2733.(in Chinese))
[2]鲍叶静,高孟潭.地震诱发滑坡的概率分析[J].岩石力学与工程学报,2005,24(1):66-71.(BAO Ye-jing,GAO Meng-tan,JIANG Hui.Probabilistic analysis of earthquake-induced landslides[J].Rock Mechanics and Engineering,2005,24(1):66-71.(in Chinese))
[3]万永革.地震物理过程模拟研究[D].北京:中国地震局地质研究所,2006.(WAN Yong-ge.Modeling on physical processes of earthquakes[D].Beijing:Institute of Geology,China Earthquake Administration,2006.(in Chinese))
[4]徐桂弘.地震诱发滑坡的危险性分析与预测[J].内陆地震,2008,22(2):188-192.(XUGui-hong.Anal-ysis and prediction of danger of landslide caused earth-quakes[J].Inland Earthquake,2008,22(2):188-192.(in Chinese))
[5]朱大栋.复杂岩质边坡的静动力稳定性分析[D].南京:河海大学,2007.(ZHU Da-dong.Study on compli-cated rock slopes of static and dynamic stability[D].Nanjing:Hohai University,2007.(in Chinese))
[6]李忠生.地震作用下滑坡稳定性分析[J].水文地质工程地质,2004,(2):4-8.(LI Zhong-sheng.Land-slide stability analysis under seismic ground motion[J].Hydrogeology and Engineering Geology,2004,(2):4-8.(in Chinese))
[7]朱学贤.岩石高边坡爆破开挖安全评价[D].武汉:长江科学院,2007.(ZHUXue-xian.Safety analysis on the dynamic stability of high rock slope induced by blasting vibration[D].Wuhan:Yangtze River Scientific Re-search Institute,2007.(in Chinese))
[8]张倬元,王士天,王兰生.工程地质分析原理[M].北京:地质出版社,1994.(ZHANG Zuo-Yuan,WANG Shi-tian,WANG Lan-sheng.Engineering Geology Theory Analyse[M].Beijing:Geology Press,1994.(in Chi-nese))
[9]陈昌凯.地震作用下边坡的有限元动力模拟[D].昆明:昆明理工大学,2006.(CHEN Chan-kai.Infinite element simulation on dynamic responses of slope underearthquake load[D].Kunming:Kunming University of Science and Technology,2006.(in Chinese))
[10]刘春玲,祁生文.利用FLAC3D分析某边坡稳定性[J].岩石力学与工程学报,2004,23(16):2730-2733.(LIU Chun-ling,QI Sheng-wen.Stability analysis of slope under earthquake with FLAC3D[J].Chinese Journalof Rock Mechanics and Engineering,2004,23(16):2730-2733.(in Chinese))
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