【摘要】 基于青岛开发区一商场爆破工程,利用颗粒离散元法建立离散元网格实体模型,用多面体离散元法模拟分析拆除爆破中建筑物的倒塌过程。研发的网格实体模型详细模拟了建筑物从结构局部失稳到整体完全倒塌的整个过程,确定了爆堆轮廓线和爆堆尺寸,直观给出了爆破设计的效果。触地振动、冲击力变化分析结果表明:所给出的爆破方案可达到预期拆除爆破的效果,触地振动符合《爆破安全规程》要求;该模型可优化爆破设计,指导爆破施工,为建筑物拆除爆破的灾害预测与安全评估提供理论依据。更多还原

【Abstract】 Based on the market blasting engineering in Qingdao development zone,the discrete element solid lattice model was established by particle discrete element method,and the collapse process in demolition blasting was simulated by polyhedral discrete element method.The whole process was simulated from the solid lattice model local structral instabicity to completely collapsing of the structure was in detail and the blasting pile profile and size were determined.The effect of blasting design was given visually.The results of the touchdown vibration and the impact force change showed that the blasting scheme could achieve the desired effect of demolition blasting and the touchdown vibration could consistent with "safety regulations for blasting" requirement.The model could optimize the blasting design,guide the blasting construction and provide the theoretical basis for disaster prediction and safety assessment of buildings blasting demolition.更多还原