汶川大地震山地灾害发育的控制因素分析

ANALYSIS OF THE CONTROLLING FACTORS ON GEO-HAZARDS IN MOUNTAINOUS EPICENTER ZONES OF THE WENCHUAN EARTHQUAKE

汶川大地震震后地质灾害调查结果表明,龙门山山地灾害无论是空间分布还是在剖面分布上均具有明显的不均一性:平面上集中在发震断裂及非发震断裂及其附近,剖面上集中在坡顶、坡折及孤立的突出地形上;运动形式具有加速起飞-滑翔-俯冲着陆三阶段。主要受控因素有发震断裂、高烈度、地震持续时间、斜坡地形效应、岩性及结构等。

Our to the mountainous epicenter zones of the Wenchuan Earthquake shows that the geo- hazard distribution in the Longmen Shan is heterogeneous on both horizontal and vertical directions. The geohazards are concentrated along the seismic fractures and non - seismic fractures in horizontal and at the top, river shoulders and isolated topography in vertical. The movement process can be divided into three stages of zero - length accelerated launching, gliding and - landing. The development of the geo - hazards is controlled by the seismic fracture, high intensity, duration of the earthquake, topography effects, the composed lithology and textures of the mountainous slopes.