侵爆荷载下地下结构隔振层优化设计研究

Research on optimization design of underground structure with vibration isolation layer under penetration and explosion load

武器侵彻爆炸对地下防护结构的振动影响不可忽视,为了提高侵彻爆炸作用下地下结构的抗打击能力,在地下结构被覆层和围岩之间设置泡沫混凝土隔振层,利用泡沫多孔特征对冲击波产生绕射,削弱冲击波对结构的压力作用,降低冲击波对结构的毁伤。应用ANSYS/LS-DYNA软件进行地下结构的侵彻爆炸数值模拟,并对隔振层设置方式进行优化分析,以确定最优隔振层设置位置和厚度。结果表明:泡沫混凝土隔振层有效减弱了结构的振动,减小了结构的内力,提高了结构的抗爆承载力;不同隔振层设置方式隔振效率不同;存在最优的隔振层厚度为0.5m。

The impact of weapon penetration and explosion on the vibration of underground protective structure cannot be ignored.In order to improve the anti-strike capability of underground structure under the action of penetration and explosion,the foamed concrete vibration isolation layer is set between the underground structure overlying layer and the surrounding rock. The diffracted effect of the blast wave caused by the porous characteristics of foamed concrete is used to weaken the pressure effect and reduce the damage of the blast wave on the structure. Using ANSYS/LS-DYNA software, the numerical simulation of penetration and explosion of underground structure was carried out, and the setting mode of vibration isolation layer was optimized to determine the location and thickness of the optimal vibration isolation layer. The results show that the foamed concrete vibration isolation layer can effectively reduce the vibration and the internal force of the structure, and improve the blast resistance of the structure;the vibration isolation efficiency of different vibration isolation layer settings is different;there is an optimal vibration isolation layer thickness of 0.5 meters.