厦门翔安海底隧道F1风化深槽注浆加固技术

Study on the grouting technology adopted in F1 weathered trough for Xiamen Xiang'an Subsea Tunnel

以厦门翔安海底隧道涌水量最大、施工难度最大的海域段F1风化槽为研究对象,根据其围岩地质条件和突涌水特点,采用全断面注浆加固和堵水,注浆加固范围为掌子面内及隧道开挖轮廓线外5 m,隧道纵向加固长度为70 m,注浆材料以超细水泥单液浆为主的注浆加固方案。施工期现场监控量测与数值计算结果表明:F1风化深槽围岩注浆加固效果均较为理想,未发生涌水突泥,达到了设计的技术要求。该项研究成果为今后开展类似工程的注浆加固提供了技术借鉴。

Focusing on F1 weathered trough which has maximum water inflow and great difficulty in construction in Xiamen Xiang＇an Subsea Tunnel,full-sectional grouting reinforcement and waterproofing,5 m grouting inside heading,70 m along longitudinal direction of tunnel and superfine cement single-fluid grouting as major grouting material were applied according to poor geological conditions and the character of sudden water inflow.Meanwhile,the corresponding parameters of grouting were established after drillings for grouting were conducted.The results of field monitoring and numerical calculation during construction show that the grouting-effect meets the qualifications of design and construction of Xiamen Xiang＇an Subsea Tunnel.The research results can provide technical reference for similar projects in grouting and waterproofing.