| 1786年磨西地震触发的摩岗岭滑坡演化过程与成因机理 |
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| 引用本文： | 周洪福,韦玉婷,王运生,刘宏.1786年磨西地震触发的摩岗岭滑坡演化过程与成因机理[J].成都理工大学学报(自然科学版),2017(6):649-658. |
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| 作者姓名： | 周洪福 韦玉婷 王运生 刘宏 |
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| 作者单位： | 1. 中国地质调查局成都地质调查中心,成都,610081;2. 四川省地质工程勘察院,成都,610072;3. 地质灾害防治与地质环境保护国家重点实验室(成都理工大学),成都,610059;4. 成都市勘察测绘研究院,成都,610081 |
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| 基金项目： | 中国地质调查局国土资源大调查项目 |
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| 摘 要： | 研究1786年磨西地震触发的摩岗岭滑坡特征及形成演化过程.采用资料收集、地面调查、三维实体模型、高精度遥感影像、理论分析、数值模拟等技术方法,对摩岗岭滑坡的形成进行全过程演化分析.摩岗岭地震滑坡演化过程分为6个阶段:河谷高边坡形成阶段以及斜坡浅表部岩体卸荷拉裂阶段、卸荷拉裂隙扩展阶段、潜在滑动面形成阶段、震动拉裂和高速启动阶段、抛射撞击溃散阶段、滑体堵江及溃决阶段.其成因机理为卸荷震动拉裂-剪断抛射堆积.
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| 关 键 词： | 地震滑坡 摩岗岭滑坡 摩西地震 演化过程 成因机理 |
Discussion on the formation evolution and genetic mechanism of Mogangling landslide triggered by Moxi earthquake,Sichuan, China |
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| Abstract: | The characteristics of Mogangling landslide,triggered by Moxi earthquake in 1786,and its formation and evolution are studied by means of data collection,field investigation,3D-modeling,high resolution remote sensing image interpretation,theoretical analysis and FEM modeling.Focus is put on the analysis of formation and evolution process of the Mogangling landslide.It reveals that the earthquake-induced Mogangling landslide has experienced 6 stages of evolution processes.Firstly,high valley slope appears in the area,followed by the formation of unloading induced fractures of superficial rock mass on the slope.Then,the unloading induced fractures develop,propagate and form the potential sliding plane.Earthquake enhances fractures and initiates the high-speed start-up of landslide,followed by projection slide,impaction and collapse.The landslide mass blocks the Dadu River and forms a barrier lake,and finally,the blocked dam collapsed.Therefore,the formation mechanisms of Mogangling earthquake-induced landslide can be summarized as unload-shock-fracture,shear off-projection-pile. |
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| Keywords: | earthquake-induced landslide Mogangling landslide Moxi earthquake genetic evolution formation mechanism |
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