| 泥石流区桥墩损毁机制与控制研究 |
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| 引用本文： | 王林峰,唐红梅,陈洪凯.泥石流区桥墩损毁机制与控制研究[J].地震学刊,2012(3):353-358. |
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| 作者姓名： | 王林峰 唐红梅 陈洪凯 |
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| 作者单位： | 重庆交通大学岩土工程研究所,重庆400074 |
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| 基金项目： | 国家自然科学基金项目（41071017）; 重庆交通大学省部共建水利水运工程教育部重点实验室开放基金项目（SLK2009B04 SLK2008B03）资助 |
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| 摘 要： | 为了保证安全,泥石流多发区的道路常采用桥梁的方式通过。位于泥石流区的桥梁的桥墩在泥石流暴发时受到泥石流的冲击,常会造成不同程度的损毁。泥石流冲击力是泥石流区桥墩受到的主要荷载,目前在计算泥石流冲击力时一般将其视为均质体,但是泥石流为固液两相流体,因此得到的计算结果误差较大。为了提高精确度,本文对泥石流冲击力计算公式进行了修正,先分别运用动力学中的弹性碰撞理论和牛顿第二定律对泥石流固相和液相的冲击力进行计算,然后将其进行叠加,得到总的泥石流冲击力。泥石流区桥墩破坏的模式主要有冲击破坏、倾覆破坏和滑动破坏3种形式。为了减小泥石流对桥墩的破坏能,可在桥墩受到泥石流冲击的部位设置消能层,通过算例发现,设置消能层后冲击力减小了26.94%。
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| 关 键 词： | 泥石流 桥墩 冲击力 毁损机制与控制 |
Study on the Mechanism of Pier′s Destruction and Control in the Active Debris Flow Regions |
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| WANG Lin-feng,TANG Hong-mei,CHEN Hong-kai.Study on the Mechanism of Pier′s Destruction and Control in the Active Debris Flow Regions[J].Journal of Seismology,2012(3):353-358. |
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| Authors: | WANG Lin-feng TANG Hong-mei CHEN Hong-kai |
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| Institution: | (Institute of Geotechnical Engineering,Chongqing Jiaotong University,Chongqing 400074,China) |
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| Abstract: | In order to ensure the road safety,bridge was adopted in the active debris flow regions.When the debris flow broke out,the pier located in the activie debris flow regions was impacted by the debris flow.The different impact forces could destruct the pier in different degrees.The debris flow′s impact force is the main load in the debris flow regions.Now,we usually consider the debris flow as an isotropic body.In fact,the debris flow is two-phase liquid,so the impact forces of debris flow included the solid phase′s impact force and liquid phase′s impact force.The two impact forces must be calculated separately.This paper has corrected the debris flow′s impact forces′ formula.Based on the inelastic collision and dynamics theory this paper receives the formula of the solid phase′s impact force.But the liquid phase′s impact force could be calculated by the Newton′s second law,because the pier′s stiffness is greater than the liquid phase′s.The destruction of pier contains three modes： impact destruction mode,capsize mode and slide mode Set a energy-dissipating layer on the pier could not only decrease the impct force but also decrease the damage potential of the debris flow.The exemple indicates that this technique′s control effect is significant. |
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| Keywords: | debris flow pier impact force mechanism of destruction and control |
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