大断面土质隧道管棚与土钉墙支护技术

Supporting technology with pipe roofing and earth-nail wall for a large-section tunnel embedded in soil

深圳沙湾隧道是广东省东江—深圳供水改造工程中开挖断面最大、地质条件最差的隧道 ,施工中结合工程特点和难点 ,在隧道进、出口段采用了超前大管棚和土钉墙联合支护技术。文章就支护的理论分析。

Shawan tunnel in Shenzhen is the one with the largest section and the worst geologic condition in the water-supply renovation works from East River to Shenzhen in Guangdong. Considering the features and difficulties of the project, a combined supporting technology with advance big pipe roofing and earth-nail wall has been adopted at the entrance and exit sections. This paper describes the theoretical analysis, construction technology and quality inspection of the supporting system.