高速公路超长隧道纵向式通风设计计算

Design and Calculation of Longitudinal Ventilation for Over-long Tunnel in Expressway

目前我国高速公路隧道通风设计,采用纵向式通风方案的临界长度为4.5 km,大于4.5 km长度的隧道通常采用分段纵向式或半横向式通风方式,这需要大大增加工程造价和运营成本。该文结合伊朗德黑兰北部高速公路Taloon隧道通风设计的成功案例,详细介绍了5 km左右隧道采用国际路协"PIARC(1995)报告"推荐的通风设计标准进行设计的计算方法。计算表明该设计方法完全能够满足国际现行通风设计要求,同时也能大大减少采用我国现行规范进行保守式设计所造成的资源浪费,对在海外高速公路隧道项目设计具有较好的借鉴意义。

As for the design of the tunnel ventilation in expressway in China,the critical length of the longitudinal ventilation scheme is 4.5 km.The tunnel being larger than 4.5 km commonly uses the by-sections longitudinal or semi-transverse ventilation mode.It is required to greatly increase the engineering cost and the operation cost.According to the successful case of the expressway Taloon tunnel ventilation design at the north of Iran Teheran,the article introduces in detail the design calculation method by the ventilation design standard recommended in 'PIARC(1995) Report' of International Road Federation used for about 5-km tunnel.The calculation makes clear that this design method can completely satisfy the current international ventilation requirement,and also can greatly decrease the resource wasting caused by the conservative design according to the current standard in China,which has the better reference for the design of the oversea expressway tunnel projects.