地形修复技术在大跨度浅埋偏压隧洞洞口段开挖中的应用研究  

Research on the application of terrain restoration technology in the tunnel entrance excavation of large-span shallow buried asymmetric pressure tunnel

作　　者：付兆凯 龙海剑[2] 祝长江 李洪涛[1] Fu Zhaokai;Long Haijian;Zhu Changjiang;Li Hongtao(College of Water Resources and Hydropower,Sichuan University,Chengdu 610065,China;PowerChina Srnohydro Bureau 7 Co.,Ltd.,Chengdu 610000,China)

机构地区：[1]四川大学水利水电学院,四川成都610065 [2]中国水利水电第七工程局有限公司,四川成都610000

出　　处：《吉林水利》2025年第3期22-26,共5页Jilin Water Resources

基　　金：国家重点研发计划(2023YFC3008305);四川省国际科技创新合作项目(2025YFHZ0165)。

摘　　要：针对巴拉溢洪洞超浅埋、大偏压、大断面洞室合理施工方案的选取问题,根据工程经验和现场调研,提出了“L型明挖开挖”“U型明挖开挖”和“地形修复”洞挖3种方案并进行对比研究。结果表明,3种方案工程量和投资差别不大,两种明挖方案均存在高直边坡失稳问题和顶部通村公路断路风险,洞挖方案无高直边坡失稳问题,对边坡扰动小,能够保证通村公路畅通。洞口段开挖研究采用了贴坡混凝土、边坡锚杆、固结灌浆、钢管桩护壁、预应力锚索、超前管棚等加固方案,工程应用良好。In view of the problem of selecting a reasonable construction scheme for the Bala Spillway Tunnel,which features ultra-shallow burial,asymmetric pressure,and large cross-section,based on engineering experience and field investigations,three excavation schemes were proposed and comparatively studied:“L-shaped open cut excavation”“U-shaped open cut excavation”and“terrain restoration with tunnel excavation”.The results indicate that there is not much difference in the project volume and investment of the three schemes.Both open cut excavation schemes have the problem of high and straight slope instability and potential disruption to the village road at the top.In contrast,the tunnel excavation scheme eliminates the risk of high and straight slope instability,causes minimal disturbance to the slopes,and ensures the smooth flow of traffic on the village road.Consequently,the“terrain restoration with tunnel excavation”scheme was adopted in the actual project.

关 键 词：水工隧洞 浅埋偏压 大跨度 洞口段开挖 

分 类 号：TV672[水利工程—水利水电工程]