【摘要】 通过实地调研5.12大地震后汶川震区附近道路沿线的滑坡与崩塌灾害分布情况,对地震烈度、地形地貌及地质构造等影响边坡动力稳定性的主要因素进行了分析。经过统计表明,沿发震断层长轴方向的地质灾害点数目明显地比垂直于断层的短轴方向比较多;地震滑坡、崩塌等地质灾害在该区域分布上以沿河流水系呈线状分布;地震引发的滑坡多集中在坡度20°～50°范围的边坡上,开始滑动的位置大多发育在边坡的中上部。此外,地震引发的滑坡、崩塌的分布与地质构造关系也非常密切,距离发震断层越近,滑坡、崩塌出现的密度就越大;上盘区域内滑坡、崩塌的出现密度及震害程度都远远大于下盘区域,并存在明显的优势滑动效应;发震断层端部、错落、转折等尖端部位在错断过程中,能量释放将会最为强烈,这些部位的地质灾害发育较为集中。更多还原

【Abstract】 Based on spot investigation for landslide and collapse distribution in seismic area of Wenchuan earthquake,the main influenceing factors of slope dynamic stability,including seismic intensity,topography,physiognomy,and geological structure,were analysed.The statistics indicates that(1) the amount of geological disasters along long axis direction of earthquake-triggering fault is obviously greater than that along short axis perpendicular to that fault;(2) the distribution features of landslide and collapse disasters are linear distribution along river systems in that region;(3) landslide induced by earthquake mainly existed in slope with 20°～50° slope angle,origin sliding position mostly generated in middle-upper part of slope;(3) the distribution of landslide and collapse induced by earthquake has close relationship with geological structure,density of landslide and collapse is greater with position close to earthquake-triggering fault;(4) the density and damage of landslide and collapse in hanging wall region is much greater than that in footwall,and advantage sliding effect obviously exists;(5)in dislocating process of earthquake-triggering fault,energy strongly released and disasters centrality appeared in peak part which includes end position,dislocating position t and transition position.更多还原