跨海峡隧道风化槽围岩衬砌防排水技术研究

 采用钻爆法修建海底隧道必须采取有效措施预防塌方、涌水、突泥等地质灾害，海底隧道钻爆法施工时如何安全穿越断层破碎带是工程设计与施工的技术难点。结合厦门跨海峡隧道围岩的特点，研究钻爆法穿越断层破碎带的注浆加固、防排水技术，提出不同围岩条件下的隧道防排水和注浆设计方案。并根据实验室三轴试验结果得到强风化花岗岩渗透系数以及反演的围岩力学参数，分析风化槽隧道衬砌的外水压力分布特点和量值。研究成果为衬砌结构设计以及国内同类型隧道的衬砌防排水和衬砌支护技术设计提供可靠指导。

WATERPROOF AND DRAINAGE TECHNOLOGIES FOR LINING OF SUBSEA TUNNEL IN WEATHERED TROUGH

Effective measures should be adopted to avoid geologic hazard such as collapse，water gushing and debris flow，when the drill and blast method is used to construct subsea tunnel. In the drill and blast method，the technical difficulty for engineering design and construction is how to ensure the safety of project when the tunnel passes through the fault zone. Combined with the characteristics of surrounding rock in Xiamen subsea tunnel，the grouting reinforcement，waterproof and drainage techniques are studied；and the related design schemes are proposed for tunnel passing through the fault zone with drill and blast method. According to the laboratory triaxial test results，the permeability of highly weathered granite is obtained. And the mechanical parameters of surrounding rock are obtained by back analysis. The distribution of external water pressure on lining of tunnel in weathered trough is obtained by numerical simulation. The achievements obtained in the research will benefit other subsea tunnels in practical engineering.