攀西黑水河流域北部地区崩塌与滑坡分布规律

攀西黑水河流域北部地区是我国地质灾害高易发地区。为深入研究该地区崩塌、滑坡灾害发育规律,基于现场调查和高精度遥感影像崩塌、滑坡解译,借助Arc GIS平台强大的空间分析能力,研究区内崩塌、滑坡的分布规律。主要成果与结论为:1研究区共发育崩塌76个,滑坡487个,93.4%的滑坡分布于10°~40°斜坡范围内,47.4%的崩塌发育于40°~50°斜坡;2地层岩土体结构组合特征及力学强度在宏观上决定山地灾害的类型及其易发性;3尽管研究区现今处于地震活动的相对平静期,但断层对崩塌、滑坡的发育仍有一定的影响(滑坡约300 m,崩塌约500 m),断层切过处往往发育大型崩塌和滑坡;4研究区滑坡的分布宏观上受河网水系的控制;5公路对滑坡发育的影响范围约300 m。

Spatial Distribution of Rockfalls and Landslides in Northern Area of Heishui River Basin in Panzhihua-Xichang Region

Geological disasters are highly prone to take place in the northern area of Heishui river basin in the Pan -zhihua-Xichang region.The distribution rules of rockfalls and landslides in the region are researched based on field investigation and high -precision remote sensing image interpretation in association with ArcGIS .The main results are concluded as follows: 1) there are 76 rockfalls and 487 landslides in the study area and 93.4% of the landslides are distributed in slope with gradient of 10°-40°,and 47.4% of the rockfalls are distributed in slope with gradient of 40°-50°; 2) the types and susceptibility of mountain hazard are determined by the combination characteristic and mechanical strength of rock and soil mass in macro scale ; 3) at present earthquake activity in the study area is rela -tively quiet, but faults also have influence on the development of landfalls within a distance of 500m and landslides of 300m, and large-scale landslides and rockfalls usually develop at regions traversed by faults ; 4) the distribution of landslides is controlled by river water system in macro sense ; 5) roads have influence on the development of landslides within a distance of 300 meters.