燃气爆炸荷载作用下地下综合管廊动力响应

DYNAMIC RESPONSE OF UNDERGROUND COMPREHENSIVE PIPE GALLERY UNDER GAS EXPLOSION LOAD

地下综合管廊在城市化建设中扮演着重要角色,其安全是城市正常运营的重要保障。依托工程实例,采用有限元软件ABAQUS建立管廊–土相互作用模型,分析管廊在燃气爆炸荷载作用下的动力响应和抗爆性能,进一步分析爆炸荷载的峰值和持时对地下管廊抗爆性能的影响。结果表明,燃气爆炸荷载作用下,管廊内墙的响应最大,且燃气爆炸荷载负压对管廊作用比正压作用时的响应大;爆炸荷载峰值越大,管廊的响应越大;爆炸荷载持时为0.2 s时,管廊响应最大,爆炸荷载持时为0.4 s时,管廊响应最小。

Underground pipe gallery plays an important role in the construction of urbanization,and its safety is an important guarantee for the normal operation of the city.Based on the engineering example,the finite element software ABAQUS is used to establish the pipe gallery–soil interaction model to analyze the dynamic response and anti-explosion performance of the pipe gallery under the gas explosion load,and further analyze the impact of the peak value and duration of the explosion load on the anti-explosion performance of the underground pipe gallery.The results show that the response of the inner wall of the pipe gallery is the largest under the gas explosion load,and the response of the negative pressure of the gas explosion load to the pipe gallery is greater than that under the positive pressure;the greater the peak value of the explosion load,the greater the response of the pipe gallery;when the explosion load lasts for 0.2 s,the response of the pipe gallery is the largest,and when the explosion load lasts for 0.4 s,the response of the pipe gallery is the smallest.