三峡库区及邻近地区滑坡发育宏观地学背景分析

Analysis on Macro Geography Background of Landslide Development at Three Gorges Reservoir Area and Nearby

三峡库区及邻近地区滑坡地质灾害受地质构造、地貌单元、地层岩性、大气降水等因素的制约,构造-岩性-地貌组合条件控制着滑坡地质灾害的形成与分布;强烈的新构造运动控制了滑坡体的集中分布地段,大型滑坡主要密集分布在地貌阶梯附近;构造应力场与滑坡滑动方向有密切关系;地貌深切的河谷及丰富的降水利于滑坡发育;滑坡发育过程实质上也是一种地貌发育形成变化的过程。在此基础上,以杨家屋场滑坡为例,对三峡库区及邻近地区滑坡发育宏观地学背景进行了分析,以便对该地区滑坡发育有新的认识和更深的研究。

Landslide disasters at Three Gorges Reservoir area and nearby are constrained by the geological structure, geomorphologie units, lithology, precipitation and other factors. The eonstruetion-lithology-geomorphologie combination of conditions is in control of the formation and distribution of landslide geological disasters. Strong new teetonie movement controls the convergence of landslide distribution. The large-landslides mainly distribute near the geomorphologie ladder; tectonic stress field is closely related to the direction of landslides. Landscape of deep valleys and abundant rainfall is helpful to the landslide development; the development of landslide is essentially a kind of geomorphologie development, formation and change in the process. On this basis, taking Yangjiawuchang landslide as an example, the macro background of landslide development of Three Gorges Reservoir area and nearby is analyzed in order to have a new understanding and further research on the landslide development in this area.