青海东部西宁盆地北缘红层滑坡成因机制与稳定性评价——以石板滩滑坡为例  

Formation mechanism and stability evaluation of a bedding landslide in red-bed strata in Xining north basin,eastern Qinghai province—a case study of Shibantan landslide

作　　者：刘义[1] 武选民[1] 王兵虎[1] 邵长庆[1] 李亮[1] 向宏[1] 王彪[1] LIU Yi WU Xuanmin WANG Binghu SHAO Changqing LI Liang XIANG Hong WANG Biao(Hydrogeology and Environmental Geology Survey Center of China Geological Survey, Baoding,Hebei 071051 ,China)

机构地区：[1]中国地质调查局水文地质环境地质调查中心,河北保定071051

出　　处：《中国地质灾害与防治学报》2016年第3期34-41,共8页The Chinese Journal of Geological Hazard and Control

基　　金：中国地质调查局"青海省东部城市群重点地区1:5万水工环地质综合调查评价"项目(12120114059701)

摘　　要：笔者在顺层滑坡形成条件和基本特征的基础上,以西宁盆地红层地区石板滩滑坡为例,对滑坡体变形特征进行分析。通过定量计算结果和定性判断相结合,并结合野外实地调查、钻探、物探、槽探、室内试验测试结果,对滑坡成因机理和稳定性进行分析和评价,最后结合滑坡的实际情况提出相应的防治对策,为该地区顺层滑坡的防灾减灾提供科学依据和指导意义。通过野外调查、Geo-Studio和FLAC3D软件的模拟研究结果,笔者认为:基岩产状和斜坡坡度相近,顺层软弱夹层和水的存在是滑坡形成的决定性因素;滑坡目前处于稳定状态,但在强降雨条件下为基本稳定—欠稳定,其变形破坏模式为牵引式。This paper is based on the bedding landslide forming conditions and basic characteristics,case of shibantan landslide in red-bed area Xi Ning Basin,the characteristics of landslide deformation is analyzed.The results are gained by quantitative calculation and qualitative judgment,and combining with the field survey,geophysical exploration,trenching,laboratory test,those are studied on the formation mechanism and stability evaluation,finally combining with the actual situation of landslide,put forward the corresponding countermeasures,for bedding landslide disaster prevention and mitigation in the region to provide scientific basis and guidance significance. Through the field survey,the numerical simulation results by Geo-Studio and FLAC3 D,this paper argues that： the similarities of rock occurrence and slope,the existence of bedding weak interlayer and water are the decisive factor for the formation of landslide; Landslide is stable now,but under the condition of heavy rainfall to basically stable,unstable,the deformation failure mode for traction.

关 键 词：顺层滑坡 石板滩滑坡 成因机理 数值模拟 稳定性评价 

分 类 号：P642.22[天文地球—工程地质学]