【摘要】 城市燃气管线与地铁隧道多有交叉,燃气有泄漏爆炸风险并对地铁隧道造成一定影响,因此有必要对燃气泄漏爆炸对地铁隧道影响进行分析。由于燃气爆炸与炸药爆炸性质有所不同,为研究燃气泄漏爆炸对地铁隧道的影响,采用TNO多能法对燃气泄漏爆炸荷载进行计算,得出爆炸荷载强度及爆炸荷载作用范围,然后将爆炸冲击荷载作用于隧道上部土体表面一定范围内进而分析爆炸冲击荷载作用下地铁隧道的动力响应。建立地铁隧道的三维数值模型,并将所计算的爆炸冲击荷载施加于模型土体表面,采用显示分析方法进行计算。分析结果表明,燃气泄漏爆炸主要对地铁隧道的竖向变形产生影响,地铁隧道竖向最大位移随爆炸荷载强度、爆炸荷载作用时间增加而近线性增加,随隧道埋深增加而近线性减小。相对爆炸荷载强度及作用时间,隧道埋深对隧道最大竖向位移影响较小。更多还原

【Abstract】 Some of the gas pipeline crosses with the subway tunnel in the city,and the gas has the risk of leaking and exploding. When the gas is leaking and exploding,the subway tunnel is affected. So it is necessary to analyze the effect of the gas leaking and exploding to the subway tunnel. Because of the difference of the explosion properties between the gas exploding and the explosive exploding,in order to study the explosive effect of the fuel gas leaking to the subway tunnel,the TNO Multi-energy method is used to calculated the explosive load of the fuel gas leaking,then the explosive impact load is acted on a certain range of the soil surface above the subway tunnel after the explosive load and region are obtained. Finally,the dynamic response of the subway tunnel under the explosive effect is analyzed. After getting the explosive load,the 3 D numerical model of the subway tunnel is built,then the explosive load is applied to the soil surface of the numerical model and the explicit computing method is carried out.The result shows that the main effect of the fuel gas exploding to the subway tunnel is the response of the vertical displacement. The max vertical displacement of the subway tunnel linearly increases when the explosive load and time increase,while the displacement linearly decreases when the buried depth increases. Relative to the explosive load and time,effect of the buried depth to the tunnel is lighter.更多还原