隧道洞口偏压高陡边坡TF横交锚固桩技术  

TF-type Transverse Anchor Pile Technology for High and Steep Slopes with Unsymmetrical Pressure at Tunnel Portals

作　　者：张湘平 张展硕[3] 赵志涛 张馨[2] ZHANG Xiangping;ZHANG Zhanshuo;ZHAO Zhitao;ZHANG Xin(Tianjin University,Tianjin 300072,China;China Railway 18th Bureau Group Co.,Ltd.,Tianjin 300222,China;Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]天津大学,天津300072 [2]中铁十八局集团有限公司,天津300222 [3]河南理工大学,河南焦作454000

出　　处：《高速铁路技术》2025年第2期76-82,共7页High Speed Railway Technology

摘　　要：隧道施工中,因山区地形地貌复杂,岩层破碎、松散等地质条件,导致隧道工程施工困难,其中较为突出的是隧道洞口人字大陡边坡大偏压、大变形的问题。针对某高速铁路隧道出口端因偏压导致的初期支护开裂、拱架变形等问题,提出一种新型的TF型横交锚固桩,并基于TF型横交锚固桩提出防治隧道边坡大偏压、大变形的一种综合加固技术。通过后期现场监测得出,所有观测桩位移率均低于5 mm/d,沉降率均低于5 mm/d,所有观测桩累计位移、沉降值均小于100 mm,且趋于稳定。TF型横交锚固桩综合加固技术能有效解决大偏压造成隧道出口的大变形问题,降低隧道施工期及高速铁路运营期的安全风险。TF型横交锚固桩综合加固技术可为隧道洞口段的施工问题提供新的解决思路。Tunnel construction often encounters difficulties due to complex topographical and geological conditions in mountainous areas,such as fractured and loose rock formations.Among these challenges,the most prominent issues are the large unsymmetrical pressure and deformation of steep,herringbone slopes at tunnel portals.To address cracking in the initial support and deformation of the form for tunnel lining at the exit end of a high-speed railway tunnel caused by unsymmetrical pressure,a novel TF-type transverse anchor pile was proposed.Furthermore,a comprehensive reinforcement technique based on the TF-type transverse anchor pile was introduced to prevent and control large unsymmetrical pressure and deformation in tunnel slopes.Field monitoring conducted subsequently revealed that the displacement rate of all observation piles was below 5 mm/d,the settlement rate was less than 5 mm/d,and the cumulative displacement and settlement values of all observation piles were less than 100 mm,with a trend towards stability.The comprehensive reinforcement technique using TF-type transverse anchor piles can effectively resolve the large deformation issues at tunnel exits caused by unsymmetrical pressure,thereby reducing safety risks during tunnel construction and high-speed railway operation.This technique provides a new solution for addressing construction problems in tunnel portal sections.

关 键 词：隧道洞口 浅埋偏压 边坡稳定 TF型横交锚固桩 

分 类 号：U455[建筑科学—桥梁与隧道工程]