西安市白鹿塬滑坡特征及成因分析

白鹿塬位于西安市东南部,白鹿塬滑坡给当地居民的生活造成了很大的困难,也制约着当地经济的可持续发展。白鹿塬滑坡在空间分布上主要集中在以下3个区域:白鹿塬的灞河一侧,河的古刘村一带,鲸鱼沟边。其中,灞河一侧几乎全为滑坡发生区,成群分布。在对西安市白鹿塬滑坡所处地质环境条件调查的基础上,运用地质与遥感方法总结了白鹿塬滑坡特征,认为白鹿塬边较大的地形差异、地层的二元结构、河流的侧蚀作用及人为的削脚是白鹿塬滑坡形成的主要原因。遥感影像图上,滑坡区塬缘处呈现弧形陡坎状,滑坡区坡体较碎,坡体上冲沟发育,有双沟交汇现象;非滑坡区较平整,与塬面浑然一体。表明遥感影像在反映滑坡体方面很有效。

Analysis of Characteristic and Cause of Formation of Landslides at Bailuyuan

Bailuyuan locates in the southeast of Xi′an city. the occurrence of landslides at Bailuyuan have brought a lot of trouble to the life of local people, and restricted the contiuable development of local economy. The landslides at Bailuyuan mainly concentrate in three areas: (1) the side of Bahe river of Baluyuan; (2) the guliu village section near to Chanhe river; (3) the side of Jinyu gouge.among them,the landslides almost exist along the side of Bahe river in group. On the basis of the investigation of geological conditions at Bailuyuan, Xi′an and by using geological and remote-sensing methods, the characteristics of landslides at Bailuyuan are described, and the main facters leading to landslides in Bailuyuan are as follows: difference in topography, dual structure of stratum, lateral erosion of rivers and artifial cutting of slope toe.. In remote sensing image,the back edge of the landslide looks like a steep arc, and the sliding body seem to be broken, there are gullys developing on the surface of landslides. Moreover, the area without landslides looks like one integrated mass. Therefore, the remote sensing image reflect the characteristics of landslides very effectively.