近场水下爆炸气泡与混凝土组合板相互作用的试验研究

Experimental Study on Interaction between Bubble and Concrete Composite Slab in Near-field Underwater Explosion

混凝土组合板(作为水工结构中的基本构件)在水下近场爆炸作用下的响应特征及对气泡运动的影响规律,是评估水下爆炸对工程结构毁伤的关键科学问题。通过开展一系列钢筋混凝土板、钢-混凝土-钢组合板的水下爆炸试验,研究了不同爆距下气泡与两种类型板构件相互作用的动态过程。获得以下规律:长径比为1的柱形装药最大半径同经验公式计算结果一致;在相同壁面条件下,随着爆距的减小,气泡脉动周期增大,气泡逐渐被壁面吸附,脉动及高速射流造成的毁伤效果增强;在相同工况条件下,钢筋混凝土板对气泡脉动过程的影响弱于钢-混凝土-钢组合板,壁面刚度越大,高速射流方向性越显著、作用效果越强。

The response characteristics of concrete composite slab,as the basic component in hydraulic structure under the action ofnear-fieldunderwater explosion and the law of itsinfluence on bubble motion are the key scientific issues to evaluate the damage of underwater explosion to engineering structures.The dynamic process of interaction among bubbles and two types of slab members at different blast distances is studied through a series of underwater explosion tests of reinforced concrete slab and steel-concrete-steel composite slab.The results show that the maximum radius of cylindrical charge with aspect ratio of 1 is consistent with the result calculated by empirical formula.Under the same wall conditions,the pulsation period of bubble increaseswith the decrease of the blast distance,the bubble is gradually adsorbed by the wall,and the damage effect caused by the pulsation and high-speed jet is enhanced.The influence of reinforced concrete slab on the bubble pulsation process is weaker than that of steel-concrete-steel composite slab under the same working conditions.The higher the wall stiffness is,the more obvious the directivity and effect of high-speed jet are.