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双线隧道常用的传统施工方法,一般对于Ⅵ～Ⅲ类围岩,采用品字形导坑、先拱后墙法,Ⅱ～Ⅰ类围岩采用侧壁导坑、先拱后墙法施工的为多。我们在××线北段×平双线隧道的施工中,由品字形导坑,先拱后墙这一基本形式变换到品字形导坑,两侧下导坑漏斗棚架,反台阶开挖。把双线隧道品字形导坑施工方法和单线隧道蘑菇形施工方法结合起来,发展为“品字形导坑蘑菇形”的施工方法。现将这一施工方法的实践和认识介绍如下。一、概况
The traditional construction methods commonly used in double-track tunnels generally adopt the shape guide pits, the arch-back wall method, the type Ⅱ ~ Ⅰ surrounding rock using sidewall guide pits, and the construction of the first arch-back wall method many. In the construction of × double line tunnel in the northern section of ×× line, the basic form of the pit-shaped pit and the first back arch wall is changed to the pit shape pit, . Combining the construction method of double-lane tunnel-shaped guide pit with the mushroom construction method of single-lane tunnel, it has been developed into the construction method of “mushroom-shaped” shape-shaped guide pit. Now the practice of this construction method and understanding are as follows. First, the overview