【摘要】 地震滑坡影响因素与滑坡崩塌分布关系的研究,有助于认识地震滑坡崩塌的发育规律,进而对潜在的地震滑坡危险区段进行划分,为土地的合理使用提供支持。5.12汶川地震引发了大量的滑坡、崩塌、碎屑流等次生灾害,造成了严重的人员伤亡和经济财产损失。以受滑坡、崩塌灾害影响严重的北川县擂鼓镇约180km2的地区作为研究对象,选取坡度、高程、坡向等影响因素进行确定性及面积发育率分析,探讨它们与滑坡、崩塌等灾害空间分布之间的关系。研究结果表明:在高程低于1km的地段,滑坡崩塌的发生频率达13.5%,高于其它地段;坡向为东向、北东向、南东向的坡体的滑坡崩塌发生率较其它方向大;随着坡度的增大,滑坡、崩塌的分布也在增大,坡度大于30°的区域滑坡发生频率较高。采用2种方法对研究区进行地震滑坡危险性区划,获得大体一致的划分结果:①基于综合确定性系数与面积发育率方法分析的地震滑坡危险性区划结果中,约有66%的滑坡崩塌落入较高危险和高危险区域;②采用判别分析法获得的地震滑坡危险性区划结果中,约有73%的滑坡崩塌判定为不稳定区域。其中,判别分析法选用的地震动、坡度、曲率等因素在不同地区都对滑坡分布具普遍的影响作用。更多还原

【Abstract】 It is useful to study the relationship between distribution of earthquake-induced landslides and influencing factors in order to predict potential hazard places in the future land using.The Wenchuan Earthquake in 8.0 Ms on May 12 triggered a lot of slopes to failure including landslides,rock falls and debris flows.The study area is about 180 km2 and located at Leiguzhen of Beichuan region where the slope-failure hazard is severe.The slope gradient,elevation and aspect are chosen as the influencing factors of the slope-failure distribution.Their relationships with the distribution of slope failures are analyzed using CF and Rji.The research shows that:1)Landslides occurred more frequently at the elevation lower than 1 000 m.2)With the increasing of the slope gradient,the occurrence probability of the slope failure becomes higher.The slope failures concentrate in the areas with the gradient greater than 30°.3)More slope failures occurred at the slopes facing E,NE,and SE.Both predict methods based on factors susceptibility analysis and discrimination analysis,show consistently in the zoning results of high hazard and low hazard.About 66% slope failures occurred in the places classifying as high and second to high degree hazard zone based on the factors susceptibility analysis,and about 73% slope failures occurred in the places judged as unstable by discrimination analysis.The factors used in discrimination analysis method such as slope gradient,curvature and seismic acceleration have widely influence on occurring of earthquake-triggered landslides.更多还原