共查询到20条相似文献,搜索用时 78 毫秒
1.
爆炸荷载作用下一种新型防护结构的静力分析 总被引:6,自引:2,他引:6
运用ANSYS大型有限元软件,对箱形钢板-钢筋混凝土组合结构这种新型的防护结构和普通钢筋混凝土结构在相同爆炸荷载下的响应进行了数值模拟和对比分析,得出了较满意的结果,说明该结构在抗爆炸领域中具有很高的应用价值。 相似文献
2.
3.
为了研究常规钻地炸弹在岩石中爆炸时对地下支护结构的影响,应用LS-DYNA有限元程序分析了地下防护工程锚喷支护结构在爆炸荷载作用下的动力响应.模型中考虑了锚杆对岩石的锚固作用,其中混凝土采用H-J-C模型,并考虑了应变率效应.与国内外经验公式的计算结果比较表明,该分析模型与方法是合理的,能据此进行爆炸荷载作用下地下结构的动力可靠性分析. 相似文献
4.
爆炸荷载作用下结构的分析分为两类:波动理论和振动理论.因为爆炸荷载持续时间非常短暂,并且应力波在结构构件中的传播非常迅速,所以爆炸荷载作用下结构构件的反应主要以整体振动为主.根据爆炸荷载持续时间与结构构件特征周期的比例关系,结构构件在爆炸荷载作用下的反应可以分为脉冲荷载区、准静态荷载区和动态荷载区.本文作者根据能量守恒基本原理,推导了弹性简支梁在爆炸荷载作用下的基本计算公式,重点研究了动态荷载区弹性简支梁的反应特征,并提出了荷载时间系数的概念.通过大量的有限元分析,得到了弹性简支梁荷载时间系数在不同荷载区的计算公式,为弹性简支梁的抗爆分析提供了理论依据. 相似文献
5.
运用ANSYS大型有限元软件 ,对箱形钢板 钢筋混凝土组合结构这种新型的防护结构和普通钢筋混凝土结构在相同爆炸荷载下的响应进行了数值模拟和对比分析 ,得出了较满意的结果 ,说明该结构在抗爆炸领域中具有很高的应用价值 相似文献
6.
为了进一步研究波纹钢拱形结构在爆炸荷载作用下的动力响应,采用ANSYS/LS-DYNA动力有限元数值方法,利用流固耦合算法,对覆土波纹钢板在土中爆炸冲击作用下的动力响应进行了数值模拟,分析了不同爆距下爆炸冲击对结构动力响应的影响。结果表明,随着爆炸距离增大,爆炸波在结构表面产生的动力响应明显减弱。 相似文献
7.
8.
采用有限元方法对空间网壳结构进行内爆炸数值模拟,利用已知的空间球面网壳结构表面爆炸冲击波压力场分布,应用LS-DYNA软件研究空间网壳结构在爆炸荷载下的动力响应.通过改变结构尺寸和TNT当量,分析结构在不同情况下的爆炸动力响应,并根据分析结果提出球面网壳结构的泄爆措施. 相似文献
9.
10.
11.
12.
介绍了炼铁高炉的冷却方式,并对各方式的冷却原理、优缺点进行了分析比较,着重论述了汽化冷却的过程,指出汽化冷却是大中型高炉炉体冷却方式的发展方向。 相似文献
13.
结合工程实例,对隧道边坡爆破施工现场普遍存在的问题进行了分析,采用深孔爆破、光面爆破等技术对隧道边坡进行爆破控制,实践证明:科学的起爆方法和爆破网络是保证隧道边坡爆破效果的关键。 相似文献
14.
分析了硐室爆破对周围设施可能造成的危害,根据周围的地质,地形条件对爆破方案进行了周密的设计,采用了多药室微差起爆的方法,完全达到了预定的爆破效果。 相似文献
15.
16.
Onder Uysal Kaan Erarslan M. Akif Cebi Hamdi Akcakoca 《International Journal of Rock Mechanics and Mining Sciences》2008,45(5):712-719
Blasting is one of the key elements of open pit mining. However, explosive usage may cause an environmental problem such as blast-induced seismic vibration. One of the solutions to the problem may be opening an artificial discontinuity as a barrier to shock waves. Such a phase is formed by lightly charging the barrier holes and firing them. This research is aimed at investigating the effect of empty barrier holes alone on seismic vibration. For this purpose, a series of field experiments were conducted in a dragline panel, Seyitomer Coal Enterprise, Kütahya, Turkey. In order to form a barrier at the centre of the panel, 30 holes were drilled on three parallel rows. The spacing between the rows was 1 m. In each row, 10 holes 1 m apart were drilled. The barrier holes were not charged and they were left empty. On the other hand, blast holes were charged and fired for rock fragmentation. Progress direction of the operation was from the ends of the panel toward the centre. At each firing, peak particle velocity (PPV) values were measured by two instruments located just in front of and behind the empty barrier holes. In this way, it could be possible to see how the empty barrier holes act. In total, 121 PPV values were recorded and analysed. Besides, in a number of experiments the barrier holes were filled with water. Analysis of data has revealed that a decrease in PPV of up to 18% has been detected just behind the barrier holes. 相似文献
17.
18.
介绍了爆破地震波作用下既有建(构)筑物振动破坏机理,探讨了避免爆破地震对既有设施造成危害的措施和方法,通过对某地铁基坑工程爆破危害性的分析计算,采取相应的措施予以保护,避免了爆破对基坑带来的安全风险。 相似文献
19.
20.
《岩石力学与岩土工程学报(英文版)》2023,15(1):255-261
The blast-induced ground vibrations can be significantly controlled by varying the location and orientation of point of interest from blast site. The blast waves generated due to individual holes get superimposed and resultant peak particle velocity (PPV) generates. With the orientation sequence of holes blasts on site, the superimposition angle of wave changes and hence results in significant variation in resultant PPV. The orientation with respect to the initiation of blasts resulting in lowest PPV needs to be identified for any site. By knowing the PPV contour of vibration waves in mine sites, it is possible to reduce the vibration on the structures by changing the initiation sequence. In this paper, experimental blasts were conducted at two different mine sites and the PPV values were recorded at different orientations from the blast site and its initiation sequence. The PPV contours were drawn to identify the orientation with least and highest PPV generation line. It was found that by merely changing the initiation sequence of blasts with respect to the sensitive structure or point of interest, the PPV values can be reduced significantly up to 76.9%. 相似文献