Abstract

To identify the correspondence between the different dynamic responses of the Daguangbao landslide and the different faulting mechanisms of the composite-hypocenter, the whole hypocenter of the Wenchuan earthquake was divided into four sub-hypocenters. On another hand, based on the location of the Dauangbao landslide, the composite-hypocenter was divided into the Initial Sub-hypocenter, the Approaching Sub-hypocenter, the Local Sub-hypocenter, the Receding sub-hypocenter and the Terminal sub-hypocenter. Subsequently, dynamic response of the landslide was modeled by using UDEC software. The results show that progressive damage and critical failure of the mega landslide are triggered by the second sub-hypocenter. Simutaneously, with respect to the second classification basis, its progressive damage is induced by the Approaching Hypocenter and the Local Hypocenter in time sequence. The Local Hypocenter triggers its critical failure. During the long-runout stage, besides the local topography, its self-gravity poses a dominant contribution to the dynamic responses of the landslide. Especially, the inertial seismic force is another key factor that triggers the ejection stage of the landslide. The following seismic forces triggered by the corresponding sub-hypocenter influence the long-runout stage slightly. The horizontal seismic force poses a dominant contribution to the progressive damage and critical failure of the mega landslide.

摘要

为确定大光堡滑坡不同动力响应与复合震源不同断层机制的对应关系，将汶川地震整个震源划分为4个亚震源。另一方面，根据道昂堡滑坡的位置，将复合震源分为初始副震源、接近副震源、局部副震源、后退副震源和终端副震源。随后，利用UDEC软件模拟了滑坡的动力响应。结果表明，大型滑坡的渐进破坏和严重破坏是由第二个次震源触发的。同时，对于二分类基准，其渐进性损伤是由接近震源和局部震源按时间顺序引起的。本地震源触发其严重故障。在长跳动阶段，除了局部地形外，其自重对滑坡的动力响应也有主要贡献。尤其是惯性地震力是触发滑坡顶出阶段的另一个关键因素。相应次震源触发的以下地震力对长跳动阶段的影响较小。水平地震力对大型滑坡的渐进破坏和严重破坏起主要作用。它的自重力对滑坡的动力响应起主要作用。尤其是惯性地震力是触发滑坡顶出阶段的另一个关键因素。相应次震源触发的以下地震力对长跳动阶段的影响较小。水平地震力对大型滑坡的渐进破坏和严重破坏起主要作用。它的自重力对滑坡的动力响应起主要作用。尤其是惯性地震力是触发滑坡顶出阶段的另一个关键因素。相应次震源触发的以下地震力对长跳动阶段的影响较小。水平地震力对大型滑坡的渐进破坏和严重破坏起主要作用。