沉箱码头聚脲涂层抗爆防护毁伤效应数值模拟

Numerical simulation of anti-explosion protection and damage effect of polyurea coating on caisson wharf

为探究爆炸荷载作用下聚脲涂层对沉箱码头的保护作用,采用LS-DANA非线性动力分析平台,模拟在1 kg TNT当量炸药水中非接触爆炸时,不同涂覆厚度聚脲涂层的沉箱码头毁伤破坏特征。结果表明:无聚脲防护的沉箱码头毁伤破坏程度明显大于涂覆聚脲防护的沉箱码头,沉箱码头的毁伤主要集中在迎爆面外墙和迎爆侧上部管沟,随着聚脲涂层厚度的增加,沉箱码头各部分毁伤程度降低;随着涂覆聚脲厚度的增加,迎爆侧外墙位移逐渐降低,但降幅较小,区域空化效应会加大外墙上部位移;无聚脲防护的沉箱码头迎爆侧外墙位移和毁伤程度明显大于涂覆聚脲防护的沉箱码头,表明聚脲涂层对于沉箱码头具有较好的保护作用。

In order to investigate the protective effect of polyurea coating on the caisson wharf under explosive loading,the damage characteristics of caisson wharf with different thicknesses of polyurea coating during the non-contact explosion of 1kg TNT equivalent explosive in the water were simulated by using the LS-DANA nonlinear dynamic analysis platform.The results showed that the damage degree of caisson wharf without polyurea protection was obviously higher than that of caisson wharf coated with polyurea protection.The damage of caisson wharf was mainly concentrated in the outer wall of explosion surface and the upper pipe trench of explosion side,and with the increase of polyurea coating thickness,the damage degree of each part of caisson wharf decreased.With the increase of polyurea coating thickness,the displacement of the explosion-proof side outer wall decreased gradually,but the decreasing amplitude was small,and the regional cavitation effect would enhance the upper displacement of outer wall.The displacement and damage degree of explosion side outer wall of the caisson wharf without polyurea protection were obviously larger than those of the caisson wharf coated with polyurea protection,which indicated that the polyurea coating has a better protective effect on the caisson wharf.