兰州黄河阶地演变过程对滑坡活动的控制效应  

Control Effect of Evolution Process of the Yellow River Terrace in Lanzhou on Landslide Activity

作　　者：张泽林[1,2] 吴树仁[1] 唐辉明[2] 黎志恒 赵成 张永军 王涛[1] 

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]中国地质大学工程学院,湖北武汉430074 [3]甘肃省地质环境监测院,甘肃兰州730000

出　　处：《地球科学（中国地质大学学报）》2015年第9期1585-1597,共13页Earth Science-Journal of China University of Geosciences

基　　金：国家"十二.五"科技支撑项目(No.2012BAK10B02)

摘　　要：为探索特殊地质环境-河流阶地孕育滑坡的相关性,更深入地认识这类河流岸坡的变形破坏过程,在广泛分析区域工程地质资料的基础上,从第四系地貌学与工程地质学相结合的角度,研究了兰州市黄河河谷演化发育的阶段性特征和黄河阶地演化对滑坡的控制效应及其诱发模式.研究表明:(1)黄河河谷的演化对兰州地区滑坡发育的控制作用具有时间上的阶段性和空间上的分带性,在河谷演化不同阶段滑坡有着不同的发育模式和形成机理;(2)阶地型滑坡主要诱发因素为新构造运动的强烈抬升、黄河强烈下切以及阶地形成期相对湿润的古气候.第三系泥岩地层间形成的软弱夹层可诱发大型黄土泥岩滑坡,而黄土层内多发中小型崩滑.河谷演化期间,滑坡的发生可能导致部分阶地的缺失.In order to explore the relationship between the geological settings and the development of the slides,and mechanisms of landslides induced by evolution of the Yellow River terrace in Lanzhou,the development phase characters of the Yellow River valley evolution in Lanzhou,control effect of the valley evolution to landslides and landslide formation model are studied in this paper based on extensive analysis of regional engineering geology data,combined with Quaternary geomorphology and engineer-ing geology.It is found that：（1）the control effect of landslides in Lanzhou induced by the Yellow River valley evolution shows phase in time and zonation in space.The landslides have different development modes and formation mechanisms in different phases of river valley evolution.（2）The major inducing factors of terrace landslides are intense neotectonics uplifting,strong incision of the Yellow River and relative moisture paleoclimate during the terraces formed.The weak intercalated layers formed in Tertiary mud-stone stratum may induce large scale loess-mudstone landslides while it may develop small-middle scale landslides and collapses in the loess layer.The landslides may lead to the deficiency of partial terraces during the river valley evolution.

关 键 词：黄河阶地 阶地演化 滑坡 控制效应 滑坡形成机理 坡面稳定性 工程地质 

分 类 号：P642.22[天文地球—工程地质学]