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| 多级旋转黄土滑坡形成机理及失稳模式 | |
| 引用本文： | 李滨,殷跃平,吴树仁,石菊松.多级旋转黄土滑坡形成机理及失稳模式[J].吉林大学学报(地球科学版),2012,42(3):760-769. |
| 作者姓名： | 李滨 殷跃平 吴树仁 石菊松 |
| 作者单位： | 1.国土资源部新构造运动与地质灾害重点实验室,北京100081; 2.中国地质科学院地质力学研究所,北京100081; 3.中国地质调查局,北京100037 |
| 基金项目： | 国家"十一·五"科技支撑项目，国家自然科学基金 |
| 摘 要： | 我国黄土高原面积广阔，地质灾害频繁发生。多级旋转黄土滑坡因其特征和成因复杂成为一种特殊的灾害类型。在野外详细调查、工程勘察的基础上，分析宝鸡渭北台塬边和永靖黑方台塬边多级旋转滑坡基本特征，认为渭北台塬大型黄土-红层多级旋转滑坡主要受新构造运动、河流的侧蚀、地层岩性等因素控制形成，黑方台的浅层旋转黄土层内滑坡和黄土-泥岩多级旋转滑坡则是长期黄土塬大面积漫灌的结果。同时首次建立了多级旋转黄土滑坡的3种形成演化模式：扩展式旋转滑坡、渐灭式旋转滑坡和复合式旋转滑坡，并进行滑坡实例分析，提出多级旋转滑坡局部蠕动挤压、滑坡加速剧滑失稳、滑坡调整稳定、后缘新滑坡孕育变形和滑后稳定调整5个变形阶段，为这类滑坡的稳定性评价奠定了基础。 |
| 关 键 词： | 多级旋转黄土滑坡 变形特征 失稳模式 滑坡 |
| 收稿时间： | 2011-08-19 |
Failure Mode and Formation Mechanism of Multiple Rotational Loess Landslides |
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| Li Bin , Yin Yue-ping , Wu Shu-ren , Shi Ju-song.Failure Mode and Formation Mechanism of Multiple Rotational Loess Landslides[J].Journal of Jilin Unviersity:Earth Science Edition,2012,42(3):760-769. | |
| Authors: | Li Bin Yin Yue-ping Wu Shu-ren Shi Ju-song |
| Institution: | 1.Key Laboratory of Neotectonic and Goehazard, Ministry of Land Resources, Beijing100081, China; 2.Institute of Geomechanics, Chinese Academy of Geological Science, Beijing100081, China; 3.China Geological Survey, Beijing100037, China |
| Abstract: | The loess plateau covers a vast area in China and is suffered from frequent geological hazards.Multiple rotational loess landslide is a special type of geological hazards owing to its basic characteristics and complicated causes.On the basis of field investigation and engineering geological survey,basic characteristics of landslides in Weibei loess tableland edge and Heifangtai loess tableland edge are analyzed.The formation of large loess-red mudstone multiple rotational landslides in Weibei tableland that is mainly affected by neotectonic movement,river lateral erosion and lithology,while multiple rotational shallow loess landslides and loess-red mudstone landslides in Heifangtai tableland are the result of a long-term excessive irrigation.Three formation and evolution modes of multiple rotational loess landslides are first built which are extensional rotational landslide,gradually extinct rotational landslide,compound rotational landslide.Examples of respective modes are introduced and analyzed.Furthermore,failure mechanism of multiple rotational loess landslides is put forward.The whole deformation process of multiple rotational loess landslides includes five phases,namely,regional creep and squeeze,accelerated sliding,temporary self-stabilizing,new landslide initializing in crown,self-stabilizing.All these works build a foundation for stability evaluation of multiple rotational loess landslides. |
| Keywords: | multiple rotational loess landslide deformation characteristics failure mode landslide |
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