水下公路隧道纵向疏散通道加压送风系统研究

为研究水下公路隧道纵向疏散通道加压送风系统的关键设计参数,结合纵向疏散通道的特点,借鉴一般建筑加压送风系统的设计要求,提出了纵向疏散通道内加压送风量的计算方法,并通过数值模拟方法对纵向疏散通道加压送风系统进行了研究。结果表明,利用风速法计算得到的送风量比压差法计算得到的结果大20倍左右,并且压差法计算送风量时受疏散口缝隙宽度影响较大,工程适用性差。通过数值模拟可知,疏散通道内的送风风速达到1.5m/s时即能够满足人员安全疏散要求,这与风速法计算的结果一致。研究结果可供采用纵向疏散模式的隧道疏散通道加压送风系统设计参考。

Study on Pressurization Air Supply System of Longitudinal Evacuation Route in Underwater Highway Tunnel

In order to study the key design parameters of pressurization air supply system of longitudinal evacuation route in underwater highway tunnel,combining the characteristics of longitudinal evacuation route,the calculation method of pressurization air supply volume in longitudinal evacuation route is proposed by drawing on the design demand of pressurization air supply system in general construction.Then the pressurization air supply system of longitudinal evacuation route is studied by numerical simulation method.It is indicated that the pressurization air supply volume calculated by air velocity method is about 20 times larger than that calculated by pressure difference method,and the width of escape exit slot has a major influence on the computation of pressurization air supply volume when using the pressure difference method,whose project serviceability is bad.It is known that the security request of evacuation is basically met when the blowing-in speed in evacuation route reaches 1.5 m/s through numerical simulation,which is consistent with the results calculated by air velocity method.The results would provide a reference for the design of pressurization air supply system in evacuation route of the tunnels using the longitudinal evacuation pattern.