爆炸荷载作用下软回填结构动力响应

A study of dynamic response of structures backfilled soft materials under explosion loads

运用数值模拟手段对有软回填层的支护结构在爆炸荷载作用下的动力响应问题进行研究，定量分析了软回填层在结构防护能力提升方面的作用。研究结果表明：软回填层可缩短结构变形恢复周期，减少竖向变形尺度，提高支护结构在变形过程中的适应性；同时，回填介质的可压缩特性为结构提供了应力释放的空间，使结构的内部应力得到充分释放，避免了应力集中。

The dynamic response of support structures backfilled with soft materials under explosion loads was analyzed, where the effect of backfilled soft materials on improving structure resistance was quantified. Numerical results reveal shorter deformation rebound cycle and reduced vertical deformation for this kind of backfilled structures, where accordingly, the structure resistance is enhanced due to stronger deformation adaptability. Meanwhile, the stress concentration problem can be avoided owing to the compressibility property of backfilled materials, which leads to full release of internal stress.