双层介质抗爆炸震塌结构的性能研究

在明挖方式构筑的地下人防工程结构中，通常采用碎石土回填层与钢筋混凝土结构共同构成抗爆炸震塌结构。在弹级、爆炸深度等相同，抗爆炸震塌结构总厚度一定的条件下，碎石土回填层厚度和钢筋混凝土结构厚度是影响结构抗爆炸震塌的主要因素。为了研究抗爆炸震塌结构最佳的厚度比值，进行了现场模型试验及理论分析，结果表明，选择低阻抗的岩土介质做回填层，不仅取材方便，而且具有较好的消波吸能性能，同时给出了几种情况下构成抗爆炸震塌结构的最佳厚度比值及其选择原则。

STUDY ON PERFORMANCE OF DOUBLE-LAYER LINING STRUCTURE AGAINST EXPLOSION-INDUCED COLLAPSE

The double-layer lining structure of soil aggregate backfilling layer and reinforced concrete structure is usually employed as anti-explosion-induced-collapse structure in the open-excavated underground civil defend projects. In the condition of the same explosion loading and the same total thickness of structures,the thicknesses of the soil aggregate backfilling layer and reinforced concrete structure are the major influencing factors of the performance of anti-explosion-induced-collapse structure. Field tests and theoretical analysis are carried out to determine the optimal structure thickness. The results show that the backfilling of low-resistance rock or soil materials has clear superiority in absorbing shock energy. The optimal thickness ratio and its application methods are given for several conditions.