富水区水工隧洞外水压力降压措施研究  

Study on Water Pressure Reduction Measures Outside Hydraulic Tunnels in Water-Rich Areas

作　　者：徐靖 曹远宜 刘畅 张继勋[2] 任旭华[2] XU Jing;CAO Yuanyi;LIU Chang;ZHANG Jixun;REN Xuhua(Construction Administration Bureau of Central Yunnan Water Diversion Project,Kunming 650205,China;College of Water Conservancy and Hydropower,Hohai University,Nanjing 210098,China)

机构地区：[1]云南省滇中引水工程建设管理局,昆明650205 [2]河海大学水利水电学院,南京210098

出　　处：《三峡大学学报（自然科学版）》2025年第1期16-21,共6页Journal of China Three Gorges University：Natural Sciences

基　　金：云南省重大科技专项计划项目(202102AF080001)。

摘　　要：外水压力是影响隧洞稳定及衬砌结构安全性的重要因素,特别是对富水地层深埋水工隧洞,高外水压力给衬砌设计带来巨大挑战.目前隧洞排水降压措施没有统一的标准,且主要聚焦于对衬砌外水压力的影响,对渗流场的影响分析还有待加强.本文依托滇中引水工程松林隧洞,借助ABAQUS软件开展隧洞围岩及衬砌结构流固耦合分析,分析在不同灌浆圈参数及排水布置方案下,隧洞渗流场及衬砌外水压力的变化规律.研究结果表明:通过改变灌浆圈厚度或降低灌浆圈的渗透性均可有效降低衬砌外水压力并减小隧洞开挖对渗流场的影响;布置排水孔亦能有效降低衬砌外水压力,且对距离排水孔越近降压效果越显著,离排水孔越远降低幅度越小且对渗流场产生较大影响,建议在实际工程中应采取堵排结合的措施来降低外水压力,并对排水孔及灌浆圈开展优化设计,以得到最优减压效果.External water pressure is an important factor affecting the stability of the tunnel and the safety of the lining structure.Especially for the deep-buried hydraulic tunnel with rich water stratum,the high external water pressure brings great challenges to the lining design.At present,there is no unified standard of pressure reduction measures for tunnel drainage,and the main focus is on the influence of external water pressure on the lining,thus the influence analysis on the seepage field needs to be strengthened.Based on Songlin Tunnel of Central Yunnan Diversion Project,this paper carried out fluid-solid coupling analysis of surrounding rock and lining structure with ABAQUS software,and analyzed the changes of seepage field and external water pressure of lining under different grouting ring parameters and drainage layout schemes.The results show that the water pressure outside the lining can be effectively reduced and the influence of tunnel excavation on the seepage field can be reduced by changing the thickness of the grouting ring or reducing the permeability of the grouting ring.The layout of drainage holes can also effectively reduce the external water pressure of the lining,and the closer the distance from the drainage holes,the more significant the pressure reduction effect is,while the farther the distance from the drainage holes,the smaller the reduction range,and the greater the impact on the seepage field.It is suggested that the combination of plugging and drainage measures should be adopted in the actual project to reduce the external water pressure,and the optimal design of drainage holes and grout rings should be carried out to obtain the optimal pressure reduction effect.

关 键 词：隧洞 灌浆圈 排水孔 外水压力 渗流场 

分 类 号：TV554[水利工程—水利水电工程]