Abstract Construction of a multiple-arch tunnel can cause safety problems because it features a large span and multi-step excavation, which can cause repeated disturbance of the soil mass and result in obvious surface settlements. Based on one section of the four-arch tunnel from Harbin South Station to Hada Station of Harbin Metro Line 1, a construction method combining double-side-drift with a middle pilot heading for a large-section four-arch tunnel is studied with a focus on elements such as the principles, characteristics，construction steps and key techniques.
Keywords ：
Four-arch tunnel Construction method Construction steps Key technology
Abstract ：
Construction of a multiple-arch tunnel can cause safety problems because it features a large span and multi-step excavation, which can cause repeated disturbance of the soil mass and result in obvious surface settlements. Based on one section of the four-arch tunnel from Harbin South Station to Hada Station of Harbin Metro Line 1, a construction method combining double-side-drift with a middle pilot heading for a large-section four-arch tunnel is studied with a focus on elements such as the principles, characteristics，construction steps and key techniques.
Keywords ：
Four-arch tunnel Construction method Construction steps Key technology
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2016, Vol. 53 