三台阶预留核心土+临时仰拱法在软弱富水围岩隧道中的应用  

Application of Three Step Reserved Core Soil+Temporary Inverted Arch Method in Weak and Watery Surrounding Rock Tunnel

作　　者：黄开龙 连其龙 HUANG Kai-long;LIAN Qi-long(Fuzhou Zuohai Construction Investment Co.,Ltd.,Fuzhou 350000,China)

机构地区：[1]福州左海建设投资有限责任公司,福州350000

出　　处：《价值工程》2025年第3期138-140,共3页Value Engineering

摘　　要：董奉山隧道地质情况差,其中V级富水软弱围岩浅埋段施工安全风险高,辅洞采用三台阶预留核心土法开挖过程中出现围岩收敛、沉降等变形较大,掌子面溜塌、初支开裂等问题,无法有效确保隧道安全进尺;为确保施工安全,加强开挖过程中支护效果,减少围岩收敛变形,项目对三台阶预留核心土法进行优化,形成了三台阶预留核心土+临时仰拱法,并在董奉山隧道中应用,从而减少了隧道围岩拱顶沉降及周边收敛,提升了隧道开挖安全性。The geological conditions of the Dongfeng mountain tunnel are poor,and the construction safety risk of the shallow buried section of the V-grade watery and weak surrounding rock is high.During the excavation process of the auxiliary tunnel using the three step reserved core soil method,there were significant deformations such as convergence and settlement of the surrounding rock,as well as problems such as collapse of the tunnel face and cracking of the initial support,which cannot effectively ensure the safe advance of the tunnel.To ensure construction safety,strengthen the support effect during excavation,and reduce the convergence deformation of surrounding rock,the project optimized the three step reserved core soil method,forming the three step reserved core soil+temporary inverted arch method,and applied it in the Dongfeng mountain tunnel,thereby reducing the settlement of the tunnel surrounding rock arch top and the convergence of the surrounding rock,and improving the safety of tunnel excavation.

关 键 词：软弱围岩 台阶法 预留核心土 临时仰拱 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]