四川省丹巴县滑坡地质灾害分布特征浅析

The preliminary study of the distribution of the landslide geological hazards in Danba,Sichuan

丹巴县滑坡地质灾害具有①集中分布在断裂带两侧的人口密集区;②在河谷两岸的分布数量相当;③主要集中分布于中等海拔的中等坡度区等特征。滑坡地质灾害的发生主要受控于区域独特的地形地貌(尤其是地形坡度)、强烈的构造运动及日益加剧的人类工程经济活动等因素。

The Danba county town, Sichuan stands at the foot of a giant palaeo-sliding mass and belongs to a highly hazardous area in Sichuan. Landslide data obtained from our field observations in Danba have been statistically studied in the present paper so as to understand the distribution of landslide geological hazards and to analyze related influencing factors. The results of research indicate that the landslide geological hazards in Danba are generally distributed： （ 1 ） along the both sides of regional faults with higher density of population; （2） along the both sides of rivers with approximately equal amounts, and （3） in the moderate altitudes with moderate slope gradients. It has been suggested that the distribution of landslide geological hazards in Danba are mainly affected by the special landforms （especially by the slope gradients）, intensely tectonic activities and increasingly intensive human activities, etc.