侧壁排烟模式下超宽断面沉管隧道火灾排烟效率研究

发布时间：2019-06-10 03:37

【摘要】：排烟效率是衡量火灾期间隧道排烟效果的重要指标。为得到侧壁排烟模式下超宽断面沉管隧道排烟特性,通过数值模拟计算对依托工程进行研究,分析排烟孔间距、排烟孔面积、排烟孔布置形式、沉管隧道宽度等因素对排烟效率的影响。结果表明:增加排烟孔数量可提高排烟效率;当排烟孔按三个一组布置时,增大排烟组间的间距有利于排烟;排烟孔均匀布置的排烟效率高于按三个一组布置;排烟孔开启数量相同时,增大排烟孔开口面积可提高排烟效率;随着沉管隧道宽度的增加,排烟效率降低,单向两车道情况下排烟效率为93.7%,单向四车道情况下排烟效率仅为45.94%。对于单向四车道超宽沉管隧道,侧壁排烟方式适用性较差。
[Abstract]:Smoke exhaust efficiency is an important index to measure the smoke exhaust effect of tunnel during fire. In order to obtain the smoke exhaust characteristics of ultra-wide section immersed pipe tunnel under side wall smoke exhaust mode, the smoke exhaust hole spacing, smoke hole area and smoke exhaust hole arrangement form are studied by numerical simulation calculation. The influence of the width of immersed pipe tunnel on smoke exhaust efficiency. The results show that increasing the number of smoke exhaust holes can improve the smoke exhaust efficiency, when the smoke exhaust holes are arranged according to three groups, increasing the distance between smoke exhaust groups is beneficial to smoke exhaust, and the smoke exhaust efficiency of uniform arrangement of smoke exhaust holes is higher than that of three groups of smoke exhaust holes, and the smoke exhaust efficiency of smoke exhaust holes is higher than that of three groups when the smoke exhaust holes are arranged in three groups. When the number of smoke holes is the same, the efficiency of smoke exhaust can be improved by increasing the opening area of smoke holes. With the increase of the width of the immersed tunnel, the smoke exhaust efficiency decreases. The smoke exhaust efficiency is 93.7% in the case of one-way two-lane and only 45.94% in the case of one-way four-lane. For one-way four-lane ultra-wide immersed tunnel, the applicability of side wall smoke exhaust is poor.
【作者单位】：招商局重庆交通科研设计院有限公司;公路隧道建设技术国家工程实验室;
【基金】：重庆市基础与前沿研究计划项目(cstc2015jcyj BX0020)
【分类号】：U458;U459.5

【相似文献】