高架桥混凝土多室箱梁水压爆破破碎机理数值模拟

孙金山; 姚颖康; 吴亮; 谢先启; 贾永胜; 韩传伟; 刘昌邦

doi:10.11883/1001-1455(2017)02-0299-08

高架桥混凝土多室箱梁水压爆破破碎机理数值模拟

doi: 10.11883/1001-1455(2017)02-0299-08

1.
中国地质大学(武汉)工程学院, 湖北武汉 430074
2.
武汉爆破有限公司, 湖北武汉 430023
3.
武汉科技大学理学院, 湖北武汉 430081

基金项目:

国家自然科学基金项目 51379194

详细信息

作者简介:
孙金山(1980-)，男，副教授，博士，sun99001@126.com

中图分类号: O383.2
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出版历程
- 收稿日期: 2015-07-20
- 修回日期: 2015-12-10
- 刊出日期: 2017-03-25

Numerical simulation of water-pressure blasting mechanism in breaking viaduct box girder

1.
Engineering Faculty, China University of Geosciences (Wuhan), Wuhan 430074, Hubei, China
2.
Wuhan Explosions and Blasting Corporation Limited, Wuhan 430023, Hubei, China
3.
College of Science, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China

摘要

摘要: 高架桥钢筋混凝土箱梁属于薄壁空腔结构，钢筋含量高，难以进行钻孔爆破破碎。以武汉沌阳高架桥爆破拆除工程为背景，提出了采用水压爆破破碎多室钢筋混凝土箱梁的方案，并采用动力有限元数值模拟方法模拟了全封闭多室箱梁结构的水压爆破破坏过程，研究了炸药在水中爆炸后诱发的冲击波和爆生气体对下箱梁结构的双重作用过程；在对数值模拟与实际爆破效果分析基础上，探讨了箱梁水压爆破方案的药包布置方式、爆破参数和起爆顺序等。
- 高架桥 /
- 钢筋混凝土箱梁 /
- 水压爆破 /
- 破碎机制 /
- 爆破方案
Abstract: As a thin-walled structure with a very high content of reinforcement, a viaduct box girder is hard to break using the drilling-style blasting. In this paper, based on the demolition project of Zhuan Yang Viaduct in Wuhan, a blasting plan using the water-pressure blasting technique was proposed to demolish multi-chamber reinforced concrete box girders. The breaking process of the multi-chamber box girder was simulated using the dynamic finite element method, the role played by the shockwave and the explosive gas in the breaking process were analyzed and, on the basis of the analysis and the actual blasting results, the charge arrangement, the blasting parameters and the blasting sequence of the water pressure blasting plan were discussed.
- viaduct /
- box girder /
- water pressure blasting /
- breakage mechanism /
- blasting plan

HTML全文

图 1 沌阳高架桥箱梁水压爆破方案

Figure 1. Water pressure blasting plan of box girder of Zhuanyang viaduct

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图 2 箱梁水压爆破有限元模型

Figure 2. Finite element model of water pressure blasting plan of box girder

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图 3 水中冲击波传播过程

Figure 3. Shock wave propagation progress in water

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图 4 药包下方箱梁底板压力时程曲线

Figure 4. Pressure time-history curve of the bottom of box girder under the explosive

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图 5 爆生气体膨胀过程

Figure 5. Expansion process of blasting gas

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图 6 箱梁破碎过程

Figure 6. Break process of box girder

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图 7 箱梁破碎效果

Figure 7. Breaking result of viaduct

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表 1 JH-2炸药计算参数

Table 1. Computational parameters of JH-2

ρ/(kg·m^-3)	D/(m·s^-1)	A/GPa	B/GPa	R₁	R₂	ω	E₀/(MJ·m^-3)
1 300	4 000	214.4	0.182	4.2	0.9	0.15	4 192

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