摘要
高强度混凝土靶板在爆炸载荷作用下的毁伤效应极其复杂,针对爆炸载荷作用下高强度混凝土靶板的破坏问题设计了相应的实验,并采用自主构建的有虚拟流体欧拉-拉格朗日双向流固耦合算法(GEL)对实验结果进行了验证与分析,深入探讨了不同装药模式、装药量、混凝土靶板强度和炸高等对毁伤结果的影响规律,总结了外爆载荷与内爆载荷作用机理的差异,揭示了高强度混凝土在爆炸载荷作用下的毁伤机理,具有很高的理论研究意义和实际应用价值.结果表明,对于外爆工况,600 g装药3种强度下的爆坑深度比300 g装药下提升了11.85%,8.82%和7.71%,而爆坑直径分别提升了15.71%,8.51%和7.51%,说明随着混凝土强度的提升,爆坑深度和爆坑直径随装药量增大而提升的量逐渐减小,且对于各强度混凝土靶板,爆坑直径随装药量增大而提升的量要大于爆坑深度提升的量.当炸高分别为0,5和10 cm时,爆炸冲击波传播到混凝土靶板中心位置时的压力峰值分别为16.08,1.33和0.30 GPa,表明随着炸高的增大,混凝土靶板爆坑深度和直径都随之减小,越靠近混凝土靶板,爆坑深度和爆坑直径的降低量越小,冲击波随着传播距离的增加呈指数级衰减,这也是导致不同炸高条件下漏斗坑破坏存在差异的主要原因.对于内爆载荷,炸药起爆之后,巨大的爆炸冲击波能量无法及时排解到空气中,冲击波传播受到了严重阻碍,导致在混凝土内壁空气的压力和密度急速升高.以C120高强度混凝土靶板为例,60 g炸药作用下的混凝土靶板爆炸漏斗坑模拟深度和直径分别比30 g炸药下提升了13.38%和77.73%,说明提升装药量对靶板横向破坏影响较大.以30 g炸药内爆工况为例,C120高强度混凝土比C40普通混凝土的爆坑深度减少13.14%,C160高强度混凝土比C120高强度混凝土的爆坑深度减少2.20%,而爆坑直径的减少程度分别为54.43%和21.77%,说明高强度混凝土比普通混凝土具有更强的抗爆能力.与外爆条件的破坏模式略有不同,内爆作用下混凝土靶板的横向破坏模式比较明显.
The damage effect of high-strength concrete target plate under the action of explosion load is very complicated.The corresponding experiment is designed for the damage problem of high-strength concrete target plate under the action of explosion load,and the experimental results are verified and analyzed by using the virtual fluid Euler-Lagrange bidirectional fluid-structure coupling algorithm(GEL)constructed by the author.The effects of different charge modes,charge amount,strength of concrete target plate and explosion height on the damage results are discussed in detail.The difference of action mechanism between external and implosive loads is summarized,and the damage mechanism of high-strength concrete under the action of explosion loads is revealed.The results showed that for the external explosion condition,the depth of the explosion pit under three different strengths of 600 g charge increased by 11.85%,8.82%,and 7.71% compared to 300 g charge,while the diameter of the explosion pit increased by 15.71%,8.51%,and 7.51%,respectively.This indicates that with the increase of concrete strength,the increase in the depth and diameter of the explosion pit with the increase of charge gradually decreases,and for concrete target plates of various strengths,the increase in the diameter of the explosion pit with the increase of charge is greater than the increase in the depth of the explosion pit.When the explosion height is 0,5,and 10 cm respectively,the peak pressure of the explosion shock wave propagating to the center position of the concrete target plate is 16.08,1.33 and 0.30 GPa,indicating that as the explosion height increases,the depth and diameter of the concrete target plate's explosion pit decrease.The closer to the concrete target plate,the smaller the decrease in the depth and diameter of the explosion pit.The shock wave decays exponentially with the increase of propagation distance,which is also the main reason for the differences in funnel pit damage under different explosion height conditions.For implosion loads,after the explosive detonates,the huge energy of the explosion shock wave cannot be dissipated into the air in a timely manner,which severely hinders the propagation of the shock wave and leads to a rapid increase in the pressure and density of the air inside the concrete wall.Taking the C120 high-strength concrete target plate as an example,the simulated depth and diameter of the explosion funnel pit of the concrete target plate under the action of 60 g explosive increased by 13.38% and 77.73% respectively compared to 30 g explosive,indicating that increasing the charge has a significant impact on the lateral damage of the target plate.Taking the 30 g explosive detonation condition as an example,the depth of the explosion pit of C120 high-strength concrete is reduced by 13.14% compared to C40 ordinary concrete,and the depth of the explosion pit of C160 highstrength concrete is reduced by 2.20% compared to C120 high-strength concrete.The reduction in the diameter of the explosion pit is 54.43% and 21.77%,respectively,indicating that high-strength concrete has stronger blast resistance than ordinary concrete.The lateral failure mode of concrete target plate under internal explosion is more obvious,which is slightly different from the failure mode under external explosion conditions.
作者
孙雁新
王成
王浩宇
王鑫
郭宇阳
乔博阳
Sun Yanxin;Wang Cheng;Wang Haoyu;Wang Xin;Guo Yuyang;Qiao Boyang(State Key Laboratory of Explosion Science and Safety Protection,Beijing Institutive of Technology,Beijing 100081,China)
出处
《力学学报》
EI
CAS
CSCD
北大核心
2024年第11期3243-3261,共19页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家自然科学基金资助项目(12221002).
关键词
GEL
流固耦合算法
高强度混凝土
毁伤效应
爆炸载荷
爆炸冲击波
GEL fluid-structure coupling algorithm
high strength concrete
damage effect
explosion load
explosion shock wave