圭嘎拉超长高海拔公路隧道进出口工区施工通风方案研究

Construction Ventilation Scheme for the Entrance and Exit Section in the Guigala Super Long High Altitude Highway Tunnel

为了研究超长高海拔高速公路隧道进出口工区施工通风方案,文章选取圭嘎拉隧道作为研究对象,分别分析了独头压入式通风与巷道式通风的通风方案。在不同分管直径工况下比较各方案的风机功率、风管长度、施工难易。结果表明,在同一施工条件下,独头压入式通风风阻过大,难以实现隧道独头掘进长度,因此建议圭嘎拉隧道进出口工区建议采用巷道式通风方案,风管的直径选取2 m。

In order to study the ventilation scheme of the entrance and exit section of the super long and high altitude highway tunnel,the paper selects the Guigala tunnel as the research object.The ventilation schemes of the forced ventilation and gallery ventilation are analyzed respectively.The fan power,the length of the ventilation pipe and the difficulty in the construction are compared under the different pipe diameter conditions.The results show that under the same construction condition,the wind resistance of forced ventilation is too large to realize the ventilation.It is suggested that gallery ventilation scheme should be adopted in the entrance and exit sections,with the pipe diameter of 2 m.