强震作用下多层土质边坡破坏规律与变形特征
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摘要
通过对汶川地震受灾区北川县陈家坝地区的地质灾害调查,根据现场松散土质边坡破坏情况,由工程地质类比法选择了计算模型和地震波,采用岩土弹塑性理论和FLAC3D软件分析了多层土质边坡在动荷载作用下边坡单元的剪切拉伸破坏和剪切应变动力响应规律。研究表明,在水平和竖直地震波联合作用下,地震边坡单元首先在坡体内产生剪切破坏。随着震动时间的增加,剪切破坏单元向坡脚和坡肩处延伸,而在坡肩处主要产生拉破坏,一旦剪切破坏面和拉破坏面贯通,将导致边坡失稳。强震过后边坡坡脚鼓出,坡肩下凹,整个坡体呈弧形破坏。
Through investigating geological hazards of Beichuan Chenjiaba town in Wenchuan earthquake disaster areas,according to engineering geologic analogy method,calculating model and seismic wave are chosen reasonably based on the investigation and analysis of the loose soil slope failure,FLAC3D simulation software and rock and soil masses of elastic-plastic theory are adopted to analyze the shear and tension failure law and shear strain dynamic response of the stratified soil element under dynamic load.The study shows that the shear failure of slope element inside the slope body will appear firstly,along with the time vibrations,shear failure elements extend to the toe and top of slope,and the tension failure mainly happens along the slope shoulder.It will cause the slope failure suddenly when shear failure surface and tension failure surface is connected.After the earthquake,the slope toe deflects to free face,meanwhile,the slope shoulder subsides,finally the failure surface of slope presents arch failure.
Through investigating geological hazards of Beichuan Chenjiaba town in Wenchuan earthquake disaster areas,according to engineering geologic analogy method,calculating model and seismic wave are chosen reasonably based on the investigation and analysis of the loose soil slope failure,FLAC3D simulation software and rock and soil masses of elastic-plastic theory are adopted to analyze the shear and tension failure law and shear strain dynamic response of the stratified soil element under dynamic load.The study shows that the shear failure of slope element inside the slope body will appear firstly,along with the time vibrations,shear failure elements extend to the toe and top of slope,and the tension failure mainly happens along the slope shoulder.It will cause the slope failure suddenly when shear failure surface and tension failure surface is connected.After the earthquake,the slope toe deflects to free face,meanwhile,the slope shoulder subsides,finally the failure surface of slope presents arch failure.
引文
[1]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.
[2]郑颖人,叶海宁,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.
[3]冯文凯,徐强,黄润秋.斜坡震裂变形力学机制初探[J].岩石力学与工程学报,2009,28(增1):3124-3130.
[4]唐辉明,李德威,胡新丽.龙山门断裂带活动特征与工程区域地壳稳定性评价理论[J].工程地质学报,2009,17(2):145-152.
[5]殷跃平.汶川八级地震滑坡高速远程特征分析[J].工程地质学报,2009,17(2):153-166.
[6]刘佑荣,唐辉明.岩体力学[M].北京:化学工业出版社,2008.
[7]方云,林彤,谭松林.土力学[M].武汉:中国地质大学出版社,2003.
[8]戴自航,刘志伟,刘成禹,等.考虑张拉与剪切破坏的土坡稳定数值分析[J].岩石力学与工程学报,2008,27(2):375-382.
[9]FUKUSUMI T,OZAKI H,KOBA M.Influence of the ground profile on the reduction of earthquake motion at the filled man-made islands in the Kobe harbor during the 1995 Hyogoken Nambu earthquake[J].Soil Dynamics and Earthquake Enginee-ring,2002,22:893-899:967-975.
[10]PAVLENKO,IRIKURA K.Nonlinearity in the response of soils in the 1995 Kobe earthquake in vertical components of records[J].Soil Dynamics and Earthquake Engineering,2002,22:967-975.
[11]王学滨,潘一山,马瑾.剪切带内部应变(率)分析及基于能量准则的失稳判据[J].工程力学,2003,20(2):111-115.
[2]郑颖人,叶海宁,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.
[3]冯文凯,徐强,黄润秋.斜坡震裂变形力学机制初探[J].岩石力学与工程学报,2009,28(增1):3124-3130.
[4]唐辉明,李德威,胡新丽.龙山门断裂带活动特征与工程区域地壳稳定性评价理论[J].工程地质学报,2009,17(2):145-152.
[5]殷跃平.汶川八级地震滑坡高速远程特征分析[J].工程地质学报,2009,17(2):153-166.
[6]刘佑荣,唐辉明.岩体力学[M].北京:化学工业出版社,2008.
[7]方云,林彤,谭松林.土力学[M].武汉:中国地质大学出版社,2003.
[8]戴自航,刘志伟,刘成禹,等.考虑张拉与剪切破坏的土坡稳定数值分析[J].岩石力学与工程学报,2008,27(2):375-382.
[9]FUKUSUMI T,OZAKI H,KOBA M.Influence of the ground profile on the reduction of earthquake motion at the filled man-made islands in the Kobe harbor during the 1995 Hyogoken Nambu earthquake[J].Soil Dynamics and Earthquake Enginee-ring,2002,22:893-899:967-975.
[10]PAVLENKO,IRIKURA K.Nonlinearity in the response of soils in the 1995 Kobe earthquake in vertical components of records[J].Soil Dynamics and Earthquake Engineering,2002,22:967-975.
[11]王学滨,潘一山,马瑾.剪切带内部应变(率)分析及基于能量准则的失稳判据[J].工程力学,2003,20(2):111-115.
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