滇中引水长隧洞斜井富水断层破碎带快速施工技术

Rapid Construction Technology for Fractured Zone of Rich Water Fault in the Inclined Shaft of Long Tunnel in Central Yunnan Water Diversion Project

以滇中引水工程昆明段蔡家村隧洞3号施工支洞穿越区域性断裂小仓—银厂箐断裂及横穿水库左、右岸为例,通过“综合法”超前地质预报手段,科学、准确的预判掌子面前方地质围岩以及地下水情况,采用超前堵水灌浆、超前大管棚、超前小导管等措施进行超前堵水兼做加固围岩,利用超前钻探兼做排水孔,采用预留核心土、分台阶开挖支护的方式,并预留变形量,保证斜井富水断层破碎带洞段安全、快速通过。

Taking Caijiacun Tunnel No.3 construction branch of Kunming section of Central Yunnan Water Diversion Project crossing the regional fault Xiaocang Yinchangqing Fault(F24)and crossing the left and right banks of the reservoir as an example,the"comprehensive method"advanced geological prediction method is used to scientifically and accurately predict the geological surrounding rock and groundwater conditions in front of the tunnel face.Advanced measures such as advanced water blocking grouting,advanced large pipe sheds,and advanced small conduits are used for advanced water blocking and reinforcement of surrounding rock.Advanced drilling is also used as drainage holes,and core soil is reserved for excavation and support in steps.Deformation is also reserved to ensure the safe and rapid passage of the fractured section of the inclined well rich water fault.