| 地震纵横波时差耦合作用的斜坡崩滑效应研究 |
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| 引用本文： | 崔芳鹏,胡瑞林,殷跃平,许强,张明.地震纵横波时差耦合作用的斜坡崩滑效应研究[J].工程地质学报(英文版),2009,17(4):455-462. |
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| 作者姓名： | 崔芳鹏 胡瑞林 殷跃平 许强 张明 |
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| 作者单位： | 1.中国科学院地质与地球物理研究所工程地质力学重点实验室|北京|100029 |
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| 基金项目： | "十一五"国家科技支撑计划项目，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)"科技减灾;重建家园"专项科研资助项目 |
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| 摘 要： | 多次典型地震的灾后实地调查都表明震中附近的竖向地震力作用十分明显，而传统的斜坡动力响应分析仅考虑了水平地震力的作用。文中运用离散元数值模拟技术，对震中附近的斜坡体在具地域性和空间非均质性的地震纵横波时差耦合作用下产生崩滑破坏的动力全过程进行了研究，确定了地震动力作用触发的震中附近斜坡体崩滑破坏的形成机制及主控因素。研究表明:对于地震作用下震中附近的斜坡体崩滑破坏，由于纵横波作用的时间差较短，其崩滑形成机制多为受地震纵横波的耦合作用，即竖向周期拉压与水平周期剪切的耦合作用，在此基础上又以纵波的竖向拉伸作用占优，即表现为拉剪破坏形式；此外，在地震构造组合机制、岩体结构与构造、斜坡岩体风化程度及物理力学参数等因素既定的情况下，地震力作用（即地震纵波的周期拉压和地震横波的周期剪切耦合作用）是诱发斜坡体产生初期崩滑破坏的主控因素，而斜坡所处地形（如高程差、沟谷延伸方向）则是促使破坏后的斜坡体形成后续碰撞解体及碎屑流等运动过程的控制诱发因素。
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| 关 键 词： | 地震纵横波，时差耦合作用，斜坡崩滑效应，离散元数值模拟，形成机制，主控因素 |
NUMERICAL SIMULATION OF SLOPE COLLAPSING AND SLIDING DUE TO SINGLE OR COMBINED ACTIONS OF SEISMIC P- AND S-WAVES WITH TIME DIFFERENCE |
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| Institution: | 1.Key Laboratory of Engineering Geomechanics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing|1000292.[JP4]State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu|6100593.China Geological Survey, Beijing|100037 |
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| Abstract: | Field geological investigations after earthquakes show that the effect of vertical seismic force is very evident, whereas only the effect of horizontal seismic force is concerned in conventional analysis of dynamic response of slopes. Collapsing and sliding responses of slope near epicenter and its running out process triggered by single and combined actions with time difference, local condtions and spatial heterogeneity of P and S seismic waves are elaborated. The formation mechanism and key controlling factors of the slope collapsing and sliding are confirmed. The result of numerical simulation shows that the slope collapsing and sliding are triggered by the combined action of seismic P- and S-waves, i.e. the coupled effect of vertical periodic tension and compression and horizontal periodic shearing. For the vertical tension of P-wave is dominant, tension and shear fractures would appear in slope body. On the other hand, combined action between periodic tension and compression of P-wave and periodic shearing of S-wave is the key controlling factor inducing slope collapsing and sliding on the conditions of known seismic tectonics, structure and tectonics of slope mass, weathering degree of rock mass and physical and mechanical parameters of slope body. At the same time, slope topography is the key controlling factor leading to collision and debris flow of slope mass fractured in latter process. It is of great theoretical and practical value in studying collapsing and sliding of slope triggered by seismic loads. |
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