全风化花岗岩偏压陡坡段隧道进洞施工技术

Construction Technology of Tunnel Entry in Steep Slope Section of Fully Weathered Granite Under Eccentric Pressure

大岭隧道浅埋段处洞身为全风化花岗岩地质,风化方式为球状风化,未完全风化的花岗岩以孤石形式存在于隧道洞身各处,浅埋段地面为冲沟,穿越冲沟时洞身露顶,此地质条件严重影响了施工安全及效率。论文以该隧道工程为例,通过对隧道现场地形、地质、水文情况进行勘察及研究,采用偏压陡坡进洞的技术确保了施工安全和质量,加快了施工进度。

The shallow buried section of Daling Tunnel is a fully weathered granite geology,and the weathering mode is spherical weathering.The partially weathered granite exists in the form of solitary stone in various parts of the tunnel body.The ground of the shallow buried section is a gully,and the tunnel body is exposed when crossing the gully.Taking the tunnel project as an example,the paper investigated and studied the topography,geology and hydrology of the tunnel site,and adopted the technology of bias steep slope to enter the tunnel to ensure the safety and quality of construction and speed up the construction progress.