通过横山隧道进口段富水破碎小净距隧道的成功实施，系统地介绍了富水破碎小净距隧道施工的综合技术，包括开挖方案优化、支护施工技术（重点是中夹岩柱加固措施及支护体系加强措施）及富水处理措施（井点降水方法），体现了施工方案的安全性和经济性。

Taking the construction of the waterrich and fractured portal section of smallnetspaced Hengshan tunnel on YongWu highway as example, the author systematically presents the comprehensive construction technology for smallnetspaced tunnels located in waterrich and fractured regions, including the optimization of the excavation plan, the reinforcement technology (with the emphasis being placed on the consolidation of the rock pillars and the strengthening of the reinforcement system) and the rich water treatment (i.e., wellpoint dewatering). The presented construction technology demonstrates that the construction plan is safe and economic.