【摘要】 四川盆周地形急变带是青藏高原东缘向四川盆地过渡的一个地形陡变带,地形地貌复杂、构造活动强烈、地层岩性复杂,内外动力地质作用非常活跃,是地质灾害高易发区和频发区。通过综合资料收集与补充调查,研究区地质灾害类型以崩塌、滑坡、泥石流、不稳定斜坡隐患为主,共发育地质灾害单体18 225处,主要灾种为滑坡,规模以中小型为主。研究区地质灾害集中于活动断裂带、深切河谷流域、红层地区、起伏山地区域,其中,活动断裂以北川-映秀断裂最为典型;深切河谷流域以岷江最为代表;红层地区为区内滑坡最佳孕灾条件;起伏山地以中起伏地貌最为广泛发育。综合考虑地质、地形条件,四川盆周地形急变带可划分为大巴山、岷山、大雪山、大凉山、乌蒙山及盆周地形急变带五个亚区,本文分别对亚区区域特征进行了总结,并对研究区地质灾害提出了相关防治建议。更多还原

【Abstract】 Southwest drastically changeable terrain locates between the east of Tibetan Plateau and Sichuan Basin,who has complex landform,strong tectonic activity and complicated formation lithology. The dynamic geological action inside and outside here is extremely active and geohazards occur easily and frequently here. Through data collecting and supplement survey,the geohazard types in research area are mainly consisted of collapse,landslide,debris flow and unstable slope. There are 18225 geohazard units developed,which mostly are small and medium landslides. The geohazards in research area is centralized in active fault zone,deep valley basin,red bed area and fluctuant mountainous region. Among them,the active fault zone is mostly represented by Beichuan-Yingxiu fault; the deep valley basin is mostly represented by the Minjiang River; red bed area has the best developmental condition for landslide;fluctuant mountainous region has extensively medium undulant landform. By considering the geological and topography conditions overall,southwest drastically changeable terrain can be divided into five subregions that are Daba Mountains,Min Mountains,Snowy Mountains,Ta-liang Mountains and Wumeng Mountains. The characteristics of each subregion is concluded and prevention proposals for geohazard in research area are presented.更多还原