| 地震滑坡启程动力学机理 |
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| 引用本文： | 顾成壮,胡卸文,罗刚,牛彦博,胡恒洋.地震滑坡启程动力学机理[J].西南交通大学学报,2012,47(4):567-572. |
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| 作者姓名： | 顾成壮 胡卸文 罗刚 牛彦博 胡恒洋 |
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| 作者单位： | 1. 西南交通大学地球科学与环境工程学院,四川成都,610031
2. 西南交通大学峨眉校区土木工程系,四川峨眉山,614202 |
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| 基金项目： | 国家自然科学基金资助项目(40972175);中央高校基本科研业务费专项资金资助项目(SWJTU11ZT14) |
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| 摘 要： | 为深入揭示地震滑坡的启程动力学机理,探讨了地震诱发滑坡的启动机制.在分析滑坡滑动前聚集的临床弹性应变能的基础上,同时考虑地震水平加速度和竖向加速度,运用能量转化原理,导出了地震滑坡启程速度的计算公式.研究结果表明,地震触发斜坡破坏,主要是其"波动振荡链"综合效应所致;地震滑坡启程阶段经历了"先启动,后加速至启程"的过程;汶川地震东河口滑坡启程速度的计算结果与用动量传递法计算的结果相比,误差约3%.
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| 关 键 词： | 波动振荡链 启动速度 能量转化率 低阻效应 启程速度 |
Setting-out Mechanism of Landslide Induced by Earthquake |
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| GU Chengzhuang
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HU Xiewen
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LUO Gang
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NIU Yanbo
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HU Hengyang.Setting-out Mechanism of Landslide Induced by Earthquake[J].Journal of Southwest Jiaotong University,2012,47(4):567-572. |
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| Authors: | GU Chengzhuang HU Xiewen LUO Gang NIU Yanbo HU Hengyang |
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| Affiliation: | 1.School of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 610031,China;2.Department of Civil Engineering,Southwest Jiaotong University,Emeishan 614202,China) |
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| Abstract: | The starting mechanism of earthquake-induced landslides was investigated in order to make a further research on the complex dynamics mechanism of landslide setting out.Based on the analysis of aggregated elastic strain energy,the expression of the setting-out velocity of seismic landslides was derived with the theory of energy conversion and by considering the vertical and horizontal accelerations of an earthquake together.The research result shows that the slope failure caused by earthquake is due to the comprehensive effect of "fluctuating oscillation chain",and seismic landslides go through a process from starting to accelerating to setting-out in the whole setting-out stage.The relative difference between calculated setting-out velocities based on the above expression and the momentum transfer method is about 3% to Donghekou landslide induced by the Wenchuan earthquake. |
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| Keywords: | fluctuating oscillation chain starting velocity energy conversion rate low resistance effect setting-out velocity |
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