考虑加速度放大效应的唐家山滑坡运动过程模拟
|
摘要
2008年汶川地震触发了大量的灾害性滑坡。地震动荷载作用下,地形加速度放大效应是影响滑坡运动过程的重要因素。一种结合有限差分法(Finite Different Method,FDM)和非连续变形分析方法(Discontinuous Deformation Analysis, DDA)的数值分析技术用于模拟和研究唐家山滑坡的运动过程。首先唐家山滑坡启动前的动力反应通过FDM模拟,并且获得启动阶段时的速度分布。然后DDA模型中每个块体的初始加速度可通过FDM模型中对应坐标附近的单元获得,而后通过施加后续的地震加速度到DDA模型的基床块体,完成唐家山滑坡整个运动过程的模拟。结果表明,模拟的滑坡的最终堆积状态与实地测量的地形数据吻合较好。
The amount of disaster landslide is triggered by the Wenchuan earthquake in 2008. The terrain acceleration amplification effect is an important factor affecting the landslide movement process under the dynamic load of earthquake. The Tangjiashan landslide motion process is simulated and studied by a numerical analysis technology combined with finite different method and discontinuous deformation analysis method. First, the dynamic response before the startup of the Tangjiashan landslide is simulated by FDM, and the distribution of speed in startup stage is gained. Then, the initial acceleration of each mass in DDA model could be obtained by the cells nearby the corresponding coordinates in FDM model. Finally, the whole movement process simulation is achieved by applying the subsequent earthquake acceleration onto the foundation bed mass of the DDA model. The results show that the simulated final accumulation state of the landslide is consistent to the topographic data based on field measurements.
The amount of disaster landslide is triggered by the Wenchuan earthquake in 2008. The terrain acceleration amplification effect is an important factor affecting the landslide movement process under the dynamic load of earthquake. The Tangjiashan landslide motion process is simulated and studied by a numerical analysis technology combined with finite different method and discontinuous deformation analysis method. First, the dynamic response before the startup of the Tangjiashan landslide is simulated by FDM, and the distribution of speed in startup stage is gained. Then, the initial acceleration of each mass in DDA model could be obtained by the cells nearby the corresponding coordinates in FDM model. Finally, the whole movement process simulation is achieved by applying the subsequent earthquake acceleration onto the foundation bed mass of the DDA model. The results show that the simulated final accumulation state of the landslide is consistent to the topographic data based on field measurements.
引文
[1]黄润秋,李为乐.“5.12”汶川大地震触发地质灾害的发育分布规律研究[J].岩石力学与工程学报,2008,27(12):2585-2592.
[2]Gorum T,Fan X,Westen C J V,et al.Distribution pattern of earthquake-induced landslides triggered by the 12 May2008 Wenchuan earthquake[J].Geomorphology,2011,133(3):152-167.
[3]许强,裴向军,黄润秋.汶川地震大型滑坡研究[M].科学出版社,2009.
[4]Xu W J,Xu Q,Wang Y J.The mechanism of high-speed motion and damming of the Tangjiashan landslide[J].Engineering Geology,2013,157(6):8-20.
[5]Shi G H,Goodman R E.Two dimensional discontinuous deformation analysis[J].International Journal for Numerical&Analytical Methods in Geomechanics,2010,9(6):541-556.
[6]Shi G H.Genralization of two-dimensional discontinuous deformation analysis for forward modeling[J].Int.j.numerical Analytical Methods in Geomechanics,1989,13.
[7]贾洪涛.基于有限元法的闸后折坡水跃数值研究[J].水利规划与设计,2016(08):40-41+115.
[8]吴利平.浅谈鹦鸽嘴水库右岸滑坡体除险加固设计[J].水利规划与设计,2016(09):117-120.
[9]翟新典,阎传宝,张庆彬.南水北调中线一期工程临城段某滑坡原因分析[J].水利规划与设计,2017(03):42-43.
[10]王志兵,房文娟,杨振琨.土工格栅在漳河灌区膨胀土渠道滑坡中的应用[J].水利规划与设计,2018(07):174-176.
[2]Gorum T,Fan X,Westen C J V,et al.Distribution pattern of earthquake-induced landslides triggered by the 12 May2008 Wenchuan earthquake[J].Geomorphology,2011,133(3):152-167.
[3]许强,裴向军,黄润秋.汶川地震大型滑坡研究[M].科学出版社,2009.
[4]Xu W J,Xu Q,Wang Y J.The mechanism of high-speed motion and damming of the Tangjiashan landslide[J].Engineering Geology,2013,157(6):8-20.
[5]Shi G H,Goodman R E.Two dimensional discontinuous deformation analysis[J].International Journal for Numerical&Analytical Methods in Geomechanics,2010,9(6):541-556.
[6]Shi G H.Genralization of two-dimensional discontinuous deformation analysis for forward modeling[J].Int.j.numerical Analytical Methods in Geomechanics,1989,13.
[7]贾洪涛.基于有限元法的闸后折坡水跃数值研究[J].水利规划与设计,2016(08):40-41+115.
[8]吴利平.浅谈鹦鸽嘴水库右岸滑坡体除险加固设计[J].水利规划与设计,2016(09):117-120.
[9]翟新典,阎传宝,张庆彬.南水北调中线一期工程临城段某滑坡原因分析[J].水利规划与设计,2017(03):42-43.
[10]王志兵,房文娟,杨振琨.土工格栅在漳河灌区膨胀土渠道滑坡中的应用[J].水利规划与设计,2018(07):174-176.