条形装药爆炸条件下地下结构的动力数值分析

军事地下工程多采用直墙拱结构形式，实战中美军大量使用的精确制导炸弹装药可视为条形装药。为研究近区爆炸条件下条形装药对直墙拱结构的动力响应影响问题，利用LS—DYNA程序进行了条形装药爆炸条件下地下直墙拱结构的动力数值分析。通过对比集团装药的数值模拟结果，发现在条形装药垂直入射结构拱项时，直墙拱顶的有效应力峰值高于集团装药达25％。因此，如果按传统方法将精确制导炸弹装药视为集团装药，进行防护工程结构计算和设计偏于不安全，根据数值计算结果提出了防护工程结构设计参考建议。

Dynamic Numerical Analysis of Underground Structure Under Strip-charge Explosion

The straight-wall-arch structure is widely used in military underground engineering. The charge of preciseguided bomb, which is largely used in battles by the US army, can be regarded as strip-charge. In order to investigate the problems of dynamic response influence near to the explosion of strip-charge, dynamic numerical analysis of underground straight-wall-arch structure in the condition of strip-charge explosion was performed by utilizing LS-DYNA program in this paper. It is discovered that the effective peak stress of straight-wall-arch structure exceeds more than 25% by contrasting with group-charge＇ s numerical simulation results when strip-charge normal incidence towards the vault of structure. Hence ,it is unsafe in calculation and design of protective engineering structure in the event of regarding the charge of precise-guided bomb as group-charge according to conventional methods, and some reference suggestions in protective engineering structure designing are put forward based on the numerical calculation results.