中文摘要：

饱和砂土地基在爆炸荷载作用下会发生液化,地基上的结构物将受到爆炸荷载及地基液化的双重作用,从而产生不均匀沉降和破坏性变形。基于大型现场爆炸液化试验,对场地上钢筋混凝土（RC）结构的动力响应和地基液化后RC结构的变形进行了分析研究。结果表明：液化场地中浅埋RC结构产生了明显的不均匀沉降,且最大沉降量达到结构高度的10%,结构差异沉降达到最大沉降量的1/5,结构沉降变形在液化后15 h时基本稳定;RC结构表面未产生明显的裂缝,动态拉、压应变均在400？？以内,不会对结构造成显著破坏;结构动力响应表现为柱侧加速度峰值明显大于梁侧,但柱侧动力稳定所需时间较梁侧短,即柱承受了更大的瞬时冲击力且其抵抗瞬时冲击力的能力更强。研究结果可以为在可液化地基中的浅埋RC结构稳定设计等工程情况提供参考。

英文摘要：

Saturated sand foundation may be liquefied under explosive load. Structures on the foundation will suffer a dual influence of explosive load and sand liquefaction, which causes uneven settlement and destructive deformation. Based on a large-scale field test of liquefied foundation induced by embedded blast, the dynamic response of the shallow-buried reinforced concrete（RC） structures subjected to explosion and its deformations after liquefaction are examined. It is indicated that, obvious uneven settlement of the RC structure occurs; and the maximum settlement reaches 10% of the height of the RC structure; and differential settlement reaches 1/5 of the maximum settlement. The settlement comes to be stable in 15 hours after the explosion. There is no obvious crack appearing on the surface of the structure; and the dynamic tensile and compressive strains are both under 400 ？？, which would not cause significant damage to the structure. The acceleration peak of the column is larger than that of the girder; however, the time required for the dynamic stability of column is shorter than that of the girder, i.e. column suffers a larger instantaneous impulse and has stronger ability to resist instantaneous impulse. The results provide references for the seismic design of shallow-buried RC structures in the liquefiable soils.