| 泥石流防撞墩冲击力理论计算方法 |
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| 引用本文： | 王强,何思明,张俊云.泥石流防撞墩冲击力理论计算方法[J].防灾减灾工程学报,2009,29(4):423-427. |
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| 作者姓名： | 王强 何思明 张俊云 |
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| 作者单位： | 1. 西南交通大学,成都,610031
2. 中国科学院山地灾害与地表过程重点实验室,成都,610041;中国科学院成都山地灾害与环境研究所,成都,610041 |
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| 基金项目： | 国家自然科学基金项目，交通部西部科技项目 |
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| 摘 要： | 在西部泥石流多发区,交通线路经常需要穿越泥石流沟,设置在泥石流沟床中的桥墩容易遭受泥石流大块石的冲击,为此,常常在其前端设置泥石流防撞墩,以达到保护桥墩的目的。防撞墩设计的关键参数是泥石流大块石的冲击力。目前,有关泥石流冲击力的计算方法都比较粗糙,计算结果与实际情况不符。本文以Thornton理想弹塑性接触模型为基础,并考虑防撞墩的弯矩变形特性,根据能量守恒定律,推导了泥石流大块石冲击力的计算公式。结果表明,考虑结构弹塑性特性后,泥石流大块石冲击力大大降低,远小于按弹性冲击理论所确定的冲击力,计算结果更符合实际情况。
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| 关 键 词： | 泥石流 防撞墩 弹塑性 冲击力 计算模型 |
Theoretical Method for Calculating Impact Force on Debris Flow Protection Piers |
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| WANG Qiang,HE Si-ming,ZHANG Jun-yun.Theoretical Method for Calculating Impact Force on Debris Flow Protection Piers[J].Journal of Disaster Prevent and Mitigation Eng,2009,29(4):423-427. |
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| Authors: | WANG Qiang HE Si-ming ZHANG Jun-yun |
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| Institution: | WANG Qiang1,HE Si-ming2,3,ZHANG Jun-yun1(1.Southwest Jiaotong University,Chengdu 610031,China,2.Key Laboratory of Mountain Hazards and Surface Process,Chinese Academy of Science,Chengdu 610041,3.Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,China) |
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| Abstract: | In the western regions of china where debris flows occur frequently,the traffic routes always need to go through the debris flow channel,so the piers built in the channels of the debris flow are easily suffered the impact of the big block rock in debris flow.Therefore,the designer generally set up the debris flow protection frustum in front of the piers to protect them.The key parameter of the design of the protection pier is the impact pressure of the big block rock in debris flow.At present,all the method... |
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| Keywords: | debris flow protection pier elastic-plastic impact force calculation model |
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