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.
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.