长江三峡库区崩滑地质灾害的形成与分布规律研究

Study on the formation and distribution of landslide geological hazard in the Three Gorges Reservoir area

长江三峡库区崩滑地质作用受岩石圈深层结构、表层地质构造和地貌新构造 3个层次因素的制约 ,构造 -岩性 -地貌组合条件控制着崩滑地质灾害的形成与分布。库区北东向的弧形构造控制了大型崩滑体的集中分布地段。库区大型崩塌主要发生在背斜核部厚层灰岩陡崖分布地带 ;大型滑坡主要发生在侏罗山式向斜槽部边缘软弱岩层形成的岸坡地带 ,并可归纳为 4个构造岩性结构类型。在此基础上对库区两岸大型崩滑体易发区段进行了划分和预测。

The geological process of landslide in the Three Gorges Reservoir area of Yangtze River is affected by the factors of three levels, i.e. deep structure of lithosphere, surface geological structure and new morphostructure. The formation and distribution of landslide geological hazard is controlled by the composite condition of structure, lithology and landform. The centralized distribution part of the massive landslide body was controlled by circular structure of northeast direction in the Three Gorges Reservoir area. The large rockfalls in the area mainly happened in the distribution zone of the thick limestone glint; The large landslide was mainly occurred in the belt of the slope bank formed by weak stratum on the edge of Jura type syncline, and might be summed up the four types of the lithologic structure. On the basis of information mentioned above, the division and forecast for the area of large easily occurred landslide body have been carried out on the both banks in the Three Gorges Reservoir area.