崔家冲隧洞软弱围岩注浆工法的研究应用

Study and Application of Grouting Method in Weak Surrounding Rock Tunnel of Cuijiachong

摘要:

长沙引水及水质环境工程崔家冲隧洞要穿越区域性高棱山压扭性断层F86，断层宽度达100余米，长度达1000余米，洞顶以上地表覆盖层达110 m，其规模为同类工程所罕见。由于断层破碎带岩体强度低，透水性好，穿越断层破碎带洞段的施工成为工程建设中的重点和难点。所以隧洞在施工过程中需采用多种方法穿越众多的不良地质段。主要介绍和探讨了该隧洞穿越F86断层破碎带所采用的超前预注浆技术、超前支护技术及长管棚施工技术，为今后在类似工程中提供施工借鉴。

Abstract:

F86 compress-shear fault was crossed for Cuijiachong tunnel of the diversion works and water quality environment project in Changsha; with 110m overburden layer, the fault was more than 100 m in width and more than 1000 m in length. Because of the low rock mass strength and good permeability, the fault fracture zone crossing became important and difficult construction problem; several methods were adopted in several poor geological sections for tunnel construction. The paper introduced pilot pre-grouting grouting, advanced support and long pipe roof techniques in F86 compress-shear fault crossing, which could be the reference for the similar projects.