基于块体单元离散模型的地铁车站爆炸破岩与防护研究

地铁已成为大、中型城市主要交通工具,然而地铁车站一直是恐怖爆炸袭击的重点对象,直接影响地铁运营安全,增强地铁车站结构防护抗爆能力至关重要.本文采用理论分析、数值模拟相结合的研究方法,利用单元内连续、单元间非连续的计算方法,构建块体单元离散弹簧动力学模型,建立地铁车站三维计算模型,模拟地铁车站内部爆炸状况,研究爆炸波空间传播和耗散规律及对构筑物破坏作用;分析低能爆炸作用下车站支柱混凝土、钢管护层混凝土和泡沫钢板夹芯护层混凝土抗爆性能,根据不同防护结构衰减应力波和吸能性能,优化地铁车站构筑物防护结构型式,提高车站抗爆能力,具有重要的实际应用价值.

STUDY OF ROCK BREAKING AND PROTECTION OF SUBWAY STATION BASED ON DISCRETE MODEL OF BLOCK ELEMENT

Subway has become a big city's main traffic tool.A subway station may easily become terrorist attack object.This directly affects the subway operation safety. It is important to enhance the subway station structure protection and antiknock ability. In this paper, the rock breaking and protection of subway station are explored by combined study of theoretical analysis, numerical simulations and experiments. Using the calculation method with discontinuous elements, three-dimensional calculation model is set up. Explosion wave propagation and dissipation regularity and damage to structures are studied, based on the discrete model of block element. The antiknock seismic performance of the station management layer of concrete pillar concrete,steel, bandages concrete and foam sandwich steel armor layer concrete is analyzed under low-energy explosions. According to different protective structure, attenuation of stress wave, and energy absorption performance, the optimization of subway station structure and structure protection type have important practical application value.