基于Hertz理论的泥石流大块石冲击力修正计算
Amending calculation on impact force of boulders in debris flow based on Hertz theory
查看参考文献18篇
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文摘
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为合理确定泥石流块石对构筑物的冲击力,以Hertz接触理论和结构力学为基础,建立泥石流大块石对桥梁的冲击模型,量化冲击系统中对象的材料特性、相对尺寸大小及结构变位对冲击力的影响,导出泥石流大块石冲击力修正计算公式.结果表明:材料修正系数在0.20~0.45之间,其值与材料屈服强度$Y$成正比,与冲击系统的等效模量$E$呈反相关关系;球径比修正系数随构筑物尺寸的增大先迅速增大而后平稳增长;结构变位修正系数受墩顶约束及冲击位置双重影响.将提出的计算方法应用于登基沟泥石流大块石对桥墩的冲击力计算,结果仅为Hertz弹性碰撞理论的6.7%,冲击力-冲击速度关系曲线平缓,与工程实践估值结果基本一致. |
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其他语种文摘
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Impact model between boulder and pier was built based on the Hertz contact theory and structural mechanics. Three main influence factors of impact force, including the material properties, relative size, and structure displacement were quantized and the modified formula was presented to calculate impact force. It shows that, material correction coefficient ranges from 0.20 to 0.45, which is proportional to material yield strength $Y$ while correlated reciprocally with the equivalent modulus of system, $E$. The correction coefficient of ball diameter ratio exhibits that, along with the increase of structure size, it increases stably after rapid growth. Structure displacement correction coefficient is affected by the constraint condition of pier top and impact location. The practical application of this modifier formula in Dengjigou engineering result is only 6.7% of the calculated value by Hertz elastic collision theory, and according to the outcome that, relation curve between impact force and impact velocity is relatively flat, which performs in accordance with practical estimation. |
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来源
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哈尔滨工业大学学报
,2017,49(2):124-129 【核心库】
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DOI
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10.11918/j.issn.0367-6234.2017.02.020
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关键词
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泥石流
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大块石冲击力
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Hertz接触力学
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结构变位
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修正因子
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地址
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中国科学院水利部成都山地灾害与环境研究所, 山地灾害与地表过程重点实验室(中国科学院), 成都, 610041
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0367-6234 |
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学科
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建筑科学 |
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基金
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国家自然科学基金重点项目
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文献收藏号
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CSCD:5937683
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参考文献 共
18
共1页
|
|
1.
Zeng Chao. Failure modes of reinforced concrete columns of buildings under debris flow impact.
Landslides,2015,12(3):561-571
|
被引
2
次
|
|
|
|
|
2.
张晨. 基于神经网络对泥石流危险范围的研究.
哈尔滨工业大学学报,2010,42(10):1642-1645
|
被引
4
次
|
|
|
|
|
3.
He Siming. Prediction of impact force of debris flows based on distribution and size of particles.
Environmental Earth Sciencess,2016,75(4):1-8
|
被引
3
次
|
|
|
|
|
4.
于献彬. 复合型拦砂坝受泥石流大块石冲击作用的动力响应.
施工技术,2015,44(24):114-119
|
被引
2
次
|
|
|
|
|
5.
胡凯衡. 泥石流冲击力的野外测量.
岩石力学与工程学报,2006,25(增刊1):2813-2819
|
被引
16
次
|
|
|
|
|
6.
章书成. 泥石流中巨石冲击力计算.
泥石流观测与研究,1996:67-72
|
被引
9
次
|
|
|
|
|
7.
Wang Quancai. Impact force of boulders conveyed in debris flows on bridge piers and anticollision measures.
International Journal of Geohazards and Environment,2016,2(2):72-81
|
被引
2
次
|
|
|
|
|
8.
Thornton C. Coefficient of restitution for collinear collisions of elastic perfectly plastic spheres.
Journal of Applied Mechanics,1997,64(2):383-386
|
被引
71
次
|
|
|
|
|
9.
Yamaguchi L.
Erosion control engineering,1985:32-45
|
被引
1
次
|
|
|
|
|
10.
Mizuyama T. Evaluation of impact of debris flow on check dams.
Journal of the Japan Society of Erosion Control Engineering,1979,32(1):269-274
|
被引
1
次
|
|
|
|
|
11.
Braccesi C. A general elasticplastic approach to impact analisys for stress state limit evaluation in ball screw bearings return system.
International Journal of Impact Engineering,2007,34(7):1272-1285
|
被引
17
次
|
|
|
|
|
12.
黄宏斌. 土石流对梳子坝撞击力之研究.
台湾水利,2006,55(1):41-58
|
被引
2
次
|
|
|
|
|
13.
Raous M. Contact mechanics.
Springer Netherlands,2009,108(4):464-468
|
被引
4
次
|
|
|
|
|
14.
周必凡.
泥石流防治指南,1991:65-68
|
被引
9
次
|
|
|
|
|
15.
何思明. 考虑弹塑性变形的泥石流大块石冲击力计算.
岩石力学与工程学报,2007,26(8):1664-1669
|
被引
36
次
|
|
|
|
|
16.
Zhang Xiang. Modeling the dependence of the coefficient of restitution on the impact velocity in elasto-plastic collisions.
International Journal of Impact Engineering,2002,27(3):317-341
|
被引
4
次
|
|
|
|
|
17.
Brizmer V. The effect of contact conditions and material properties on the elasticity terminus of a spherical contact.
International Journal of Solids and Structures,2006,43(18/19):5736-5749
|
被引
31
次
|
|
|
|
|
18.
曾聪. PTFE-不锈钢摩擦滑移隔震支座摩擦系数的影响因素研究.
工程抗震与加固改造,2009,31(1):58-63
|
被引
6
次
|
|
|
|
|
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