为了安全快速地穿越富水破碎带区段,结合小净距隧道的结构特点,基于现场钻探揭露结论及涌水量、水压的测定结果,提出了小净距隧道左右洞交替作为导流洞的防排水施工技术。基于流固耦合理论,采用FLAC~(3D)数值模拟软件分析了左右隧洞并行掘进时,围岩孔隙水压力及围岩位移的分布特征,揭示了围岩变形与孔隙水压力的相互作用机理,并结合现场围岩变形监测数据与掌子面最大涌水量数据,验证了该防排水施工技术的可行性。 In order to safely and quickly traverse the section of water-rich fractured zone and combine with the structural characteristics of small spacing tunnels, based on the conclusion of field drilling and the determination of water inflow and water pressure, it is proposed that the left and right tunnels with small clear distance tunnel alternately act as diversion tunnel Waterproof construction technology. Based on the fluid-solid coupling theory, the FLAC 3D numerical simulation software is used to analyze the distribution characteristics of pore water pressure and surrounding rock displacement when the tunnels are driven in parallel, and the interaction mechanism between rock deformation and pore water pressure is revealed. The feasibility of this drainage and drainage construction technology is verified by combining the monitoring data of the surrounding rock deformation with the data of the maximum gushing water of the face.