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.