【摘要】 针对在野外调查过程中发现汶川地震灾区的一些特殊区域,滑坡的滑动方向呈现出一些与地震动力直接相关的异常现象,作者对典型研究区进行了详细的遥感解译,统计了不同坡向上滑坡灾害的发育密度和大型滑坡滑向与发震断层的关系,得出汶川地震诱发滑坡具有"背坡面效应"和"断层错动方向效应"。"背坡面效应"是指在与发震断裂带近于垂直的沟谷斜坡中,在地震波传播的背坡面一侧的滑坡发育密度明显大于迎坡面一侧。"断层错动方向效应"是指滑坡的滑动方向与发震断裂的活动方式和错动方向密切相关。在分析强震诱发滑坡成因机理时,应加强对2种因素和效应的研究:1)地震时断裂的突然错动所产生的直接动力对斜坡失稳的初始驱动作用;2)地震过程中地震波在斜坡山体内传播的折射、反射以及由此引起的坡体内应力的变化。更多还原

【Abstract】 According to the field investigation,it was founded that in some special areas,the sliding direction of landslides presented a few unusual features related to the earthquake dynamics.Through the detailed remote-sens-ing interpretation of the study area,the landslide density in slopes of different direction was calculated and the rela-tionship between the sliding direction of large-scale landslides and seismic fault was analyzed,and two features of Wenchuan Earthquake-triggered landslides were obtained,including back-slope and fault diastrophism direction effects.These two effects indicated that when analyzing the genetic mechanism of landslides triggered by strong earthquake,more attention should be given to the following two factors,one being the initial driving force produced by the abrupt diastrophism of seismic fault to slope instability and the other being the refraction and reflection of seismic wave in the slope body and the change of its internal stress thus incurred.更多还原