Directional water pressure blasting of Jamuna bridge and its numerical simulation
-
摘要: 为了分析及研究薄壁空腔桥墩的水压爆破机理，以孟加拉国贾木那大桥水压定向爆破拆除工程为研究对象，采用显示动力学分析软件模拟了桥墩的水压爆破破碎过程，根据数值模拟结果，得出了水压爆破主要是利用爆炸冲击波、爆轰气体、反射拉伸波及高速水流对桥墩壁面进行破坏，在此基础上，探讨了桥墩水压定向爆破的药包布置方式、起爆顺序等技术问题。Abstract: In this study we investigated the mechanism of water pressure blasting in the thin-walled bridge pier, taking the water pressure directional blasting demolition project of Jamuna bridge as the research object and using the explicit dynamics analysis software to simulate the crushing process of the water pressure blasting in the bridge pier. The numerical simulation results show that the failure of the bridge pier mainly depends on the explosive shock wave, the detonation gas, the reflected tension wave and the high-speed flow. Based on these findings, we examined the technical problems of the arrangement of the explosive charge and the order of detonation in the directional water pressure blasting in the bridge pier.
-
图 2 桥墩水压爆破有限元模型
Figure 2. Finite element model of water pressure blasting plan of bridge pier
图 4 不同传播介质时桥墩总体能量历时曲线
Figure 4. The total energy diachronic curve of bridge pier in water and air mediums
表 1 水压爆破相关参数
Table 1. Water pressure blasting parameters
结构物编号 δ/m R/m k k2 Q/kg Ⅰ、Ⅲ 0.536 1.029 5 1.305 2.938 Ⅱ 0.480 0.820 5 1.351 1.894 注：Q 分别取整数，即Ⅰ、Ⅲ区域总药量取 3 kg，Ⅱ区域取 2 kg。 
下载: 导出CSV
表 2 乳化炸药计算参数
Table 2. Computational parameter of emulsion explosive
A/GPa B/GPa R1 R2 ω E0/(MJ·m−3) ρe/(kg·m−3) D/(m·s−1) 214.4 0.182 4.2 0.9 0.15 4 192 1 447 4 300
下载: 导出CSV
-
[1] 张亚宾, 张云鹏, 李占金, 等. 水压爆破的数值模拟 [J]. 河北理工大学学报 (自然科学版), 2007, 29(4): 1–4. DOI: 10.3969/j.issn.1674-0262.2007.04.001.ZHANG Yabin, ZHANG Yunpeng, LI Zhanjin, et al. Study on hydraulic blasting with numerical simulation [J]. Journal of Hebei Polytechnic University (Natural Science Edition), 2007, 29(4): 1–4. DOI: 10.3969/j.issn.1674-0262.2007.04.001. [2] 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. DOI: 10.3963/j.issn.1001-487X.2010.04.018.YANG Zhonghua, YANG Jun, CHEN Dayong. Study on water pressure blasting of reinforced arch seat and hollow pillarin numerical simulation [J]. Blasting, 2010, 27(4): 70–73. DOI: 10.3963/j.issn.1001-487X.2010.04.018. [3] 孙金山, 姚颖康, 吴亮, 等. 高架桥混凝土多室箱梁水压爆破破碎机理数值模拟 [J]. 爆炸与冲击, 2017, 37(2): 299–306. DOI: 10.11883/1001-1455(2017)02-0299-08.SUN Jinshan, YAO Yingkang, WU Liang, et al. Numerical simulation of water-pressure blasting mechanism in breaking viaduct box girder [J]. Explosion and Shock Waves, 2017, 37(2): 299–306. DOI: 10.11883/1001-1455(2017)02-0299-08. [4] 汪旭光. 爆破设计与施工[M]. 北京: 冶金工业出版社, 2011: 454−460. [5] 金淳圭. 水压控制爆破合理参数的确定 [J]. 爆炸与冲击, 1992, 12(4): 363–370.JIN Chungui. Determination of proper parameters of water pressure control blasting [J]. Explosion and Shock Waves, 1992, 12(4): 363–370. [6] 袁俊平, 王启贵. 水力劈裂楔劈效应试验研究 [J]. 岩土力学, 2015, 36(12): 3360–3364. DOI: 10.16285/j.rsm.2015.12.003.YUAN Junping, WANG Qigui. An experimental study of wedge splitting effect of hydraulic fracturing [J]. Rock and Soil Mechanics, 2015, 36(12): 3360–3364. DOI: 10.16285/j.rsm.2015.12.003. [7] 张世文, 胡美娥, 贾宏志. 冲击波加载区域对冲击波速度和衰减的影响 [J]. 应用力学学报, 2016, 33(3): 371–377. DOI: 10.11776/cjam.33.03.B052.ZHANG Shiwen, HU Meie, JIA Hongzhi. Influence of shockwave loading area on its propagating velocity and decay law [J]. Chinese Journal of Applied Mechanics, 2016, 33(3): 371–377. DOI: 10.11776/cjam.33.03.B052. [8] 罗福友. 城市爆破中电子雷管与导爆管雷管的应用对比 [J]. 火工品, 2017(2): 57–60. DOI: 10.3969/j.issn.1003-1480.2017.02.015.LUO Fuyou. Application contrast of digital electronic detonator and ordinary detonator in city blasting [J]. Initiators and Pyrotechnics, 2017(2): 57–60. DOI: 10.3969/j.issn.1003-1480.2017.02.015. -
点击查看大图
计量
- 文章访问数: 5785
- HTML全文浏览量: 1939
- PDF下载量: 47
- 被引次数: 0