Numerical simulation of water-pressure blasting mechanism in breaking viaduct box girder
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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。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.
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Key words:
- viaduct /
- box girder /
- water pressure blasting /
- breakage mechanism /
- blasting plan
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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
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
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
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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[1] 张宪堂, 陈士海.多层复合壁构筑物水压爆破药量计算及应用[J].爆炸与冲击, 1999, 13(3):256-261. http://www.bzycj.cn/CN/abstract/abstract10351.shtmlZhang Xiantang, Chen Shihai. Calculation and application of water pressure blasting with multi-layered compound walls[J]. Explosion and Shock Waves, 1999, 13(3):256-261. http://www.bzycj.cn/CN/abstract/abstract10351.shtml [2] 周听清, 奉孝中.水压爆破中群药包药量的计算[J].中国科学技术大学学报, 2000, 30(5):593-599. doi: 10.3969/j.issn.0253-2778.2000.05.014Zhou Tingqing, Feng Xiaozhong. The Numeration of multi-charges weight for explosive in the water-pressure blasting[J]. Journal of University of Science and Technology of China, 2000, 30(5):593-599. doi: 10.3969/j.issn.0253-2778.2000.05.014 [3] 谢俊杰, 龙源, 吴腾芳, 等.水压爆破在特殊结构构筑物拆除中的应用技术[J].工程爆破, 2005, 11(4):50-53. doi: 10.3969/j.issn.1006-7051.2005.04.014Xie Junjie, Long Yuan, Wu Tengfang, et al.Application technology of water pressure blasting to demolish of especial structure building[J]. Engineering Blasting, 2005, 11(4):50-53. doi: 10.3969/j.issn.1006-7051.2005.04.014 [4] 段卫东, 马建军, 钟冬望.水压爆破拆除矩形钢筋混凝土酿酒池[J].工程爆破, 2003, 9(2):60-62. doi: 10.3969/j.issn.1006-7051.2003.02.017Duan Weidong, Ma Jianjun, Zhong Dongwang.Demolition of a reinforced-concrete wine-making rectangular pool by water-pressure blasting[J]. Engineering Blasting, 2003, 9(2):60-62. doi: 10.3969/j.issn.1006-7051.2003.02.017 [5] 李耀光.水压爆破拆除钢筋砼蓄水池工程实践[J].爆破, 2007, 24(1):79-80, 83. doi: 10.3963/j.issn.1001-487X.2007.01.023Li Yaoguang. Application of hydraulic explosion in demolishing a reinforced concrete pool[J]. Blasting, 2007, 24(1):79-80, 83. doi: 10.3963/j.issn.1001-487X.2007.01.023 [6] 杨忠华, 杨军, 陈大勇.混凝土拱座空心立柱水压爆破数值模拟研究[J].爆破, 2010, 27(4):70-73. http://d.old.wanfangdata.com.cn/Periodical/bp201004018Yang Zhonghua, Yang Jun, Chen Dayong. Study on water pressure blasting of reinforced arch seat and hollow pillar in numerical simulation[J]. Blasting, 2010, 27(4):70-73. http://d.old.wanfangdata.com.cn/Periodical/bp201004018 [7] Holmquist T J, Johnson G R. A computational constitutive model for concrete subjected to larger strains, high strain rates and high pressure[C]//Jackson N, Dickert S. 14th International Symposium Ballistics. USA: American Defense Preparedness' Association, 1995, 591-600. [8] 吴亮, 钟冬望, 卢文波.空气间隔装药爆炸冲击荷载作用下混凝土损伤分析[J].岩土力学, 2009, 30(10):3109-3104. doi: 10.3969/j.issn.1000-7598.2009.10.037Wu Liang, Zhong Dongwang, Lu Wenbo. Study of concrete damage under blast loading of air-decking[J]. Rock and Soil Mechanics, 2009, 30(10):3109-3104. doi: 10.3969/j.issn.1000-7598.2009.10.037 -
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