典型工况下城市隧道竖井自然排烟模拟优化分析

为增强竖井自然排烟能力，开展竖井设置方案模拟优化研究。建立了竖井自然排烟能力对比评估模型，通过分析得到评估指标和评估方法。运用FDS对不同高度、横向设置、均匀设置和竖井组不同开口数目4种典型工况下的竖井排烟效果进行了模拟分析。得到优化方案如下：竖井组高度为16 m时排烟能力达到最强，横向设置竖井排烟能力明显强于纵向设置竖井，均匀设置竖井组排烟能力明显强于集中设置竖井组，随着竖井宽高比增加，竖井组的排烟能力逐渐减弱。

Optimizing analysis of shaft natural smoke exhaust of city tunnel by simulation under typical case

To enhance the ability of natural smoke exhaust, the optimizing study on shaft establishment scheme by simulation was conducted. Aiming at optimizing the natural smoke exhaust of city tunnel,the contrastive evaluation model was established, and the evaluation index and method were obtained. Then fire dynamics simutalor (FDS) was adopted to simulate the smoke exhaust effect of shafts with different height, transverse arrangement shafts, equidistributed shafts and shafts with different numbers of opening. The result of simulation was analyzed according to the evaluation method. The optimization results are particularized as follows: the smoke exhaust ability becomes the strongest when the shaft height comes to 16m; The smoke exhaust ability of transverse arrangement shafts is stronger than that of the longitudinal arrangement shafts; The smoke exhaust ability of the equidistributed arrangement shafts is stronger than that of the centralized arrangement shafts; The smoke exhaust ability becomes weak as the width height ratio of shafts increases.