渭河盆地滑坡及其构造基础

LANDSLIDES AND THEIR TECTONIC FOUNDATION IN WEIHE RIVER BASIN

渭河盆地有滑坡1060处,以黄土滑坡为主,大型滑坡多为复活的古老滑坡,近期有23处在蠕动变形。它们主要集中在5条滑坡带和雨片滑坡区中,常造成阻断交通、摧毁厂矿、掩没村庄、压死人畜的事件,灾害甚重。渭河盆地区域性的黄土构造节理是黄土原有的软弱面和地下水下渗的通道;主要活动断层和活动断块分别控制上列滑坡带和滑坡区的分布,其活动特征、断距和长度大小分别决定了沿线多数滑坡的分布规律、发育程度和规模大小。它们同是该区滑坡的构造基础。

There are 1060 landslides ever found in Weihe River basin. Most of them are considered as loess landslides. The large scale landslides are mostly the reactive of ancient ones. In recent period 23 new landslides are in creeping and deforming. All the landslides distribute concentratedly and can be divided into 5 landslide belts and 2 landslide districts, Where serious landslide disasters happen constantly, and cause a lot of problems, such as the blocking of traffic, the destroying of factories, the burying of villages and the killing of people and livestock. These landslide belts and districts are mainly controlled by the active faults and blocks in Weihe rift valley at most points, such as the distribution, the scale and the development degree. Also the regional loess structural joint, which is the primary weak plane and passage of underground water, is the component of the, tectonic foundation of the landslides.