陕西延安地区黄土滑坡特征及其活跃性分期

Characteristics and staging of the loess landslide in the Yan'an area,Shaanxi province

延安地区位于黄土高原中部,地质灾害频发。本文结合延安地区地质灾害详细调查结果,从该地区环境变迁分析滑坡分布特征。从以下三个方面进行了分析,第一方面分析了延安地区滑坡的特点;第二方面从沉积环境分析控滑面的类型分析滑坡发育规律,而不同的控滑面形成环境不同,作用机理不同;第三方面从冷暖湿热气候变迁对黄土滑坡存在三个活跃期进行了阐述,滑坡发育期与其环境变迁存在息息相关的联系,在第四纪以来三个明显湿润期在时间上产生了三个明显阶段的滑坡。

Yanan area is located in the middle of the Loess Plateau and frequent geological disasters. This paper, combining geological disasters detailed survey results analysis Landslide distribution characteristics from the region environment change. Analysis from three aspects, the first, analysis types and functions of sliding surface from sedimentary environment; The second, from the loess sedimentary law, the loess particle size distribution reduce gradually from northwest to southeast, physieo-mechanieal properties along with the particle size distribution changes, the scale of loess landslides and particle size distribution has certain regularity; The third, in this paper, from the changes in temperature hot and humid climate change in loess landslides are three active period is discussed.