浅埋超大跨四线隧道围岩变形基准值研究  

Study on the Reference Value of Surrounding Rock Deformation in Shallow-buried Super-large-span Four-track Tunnel

作　　者：刘夏冰 麻建飞 孙林 LIU Xiabing;MA Jianfei;SUN Lin(Guangdong Hualu Transport Technology Co.,Ltd.,Guangzhou 510420,China;Guangdong Provincial Key Laboratory of Tunnel Engineering Safety and Emergency Support Technology and Equipment Enterprises,Guangzhou 510420,China;Beijing Jiaotong University,Beijing 100044,China;Sichuan Road and Bridge Construction Group Co.,Ltd.,Chengdu 610041,China)

机构地区：[1]广东华路交通科技有限公司,广州510420 [2]广东省隧道工程安全与应急保障技术及装备企业重点实验室,广州510420 [3]北京交通大学,北京100044 [4]四川公路桥梁建设集团有限公司,成都610041

出　　处：《高速铁路技术》2024年第4期94-99,共6页High Speed Railway Technology

基　　金：中铁大桥局集团有限公司资助基金项目(CL19048530)。

摘　　要：为确定浅埋超大跨四线隧道的围岩变形基准值,以初期支护结构极限安全系数为判断标准,建立了分部开挖方法下的围岩变形动态基准值体系,以下北山四线高速铁路隧道为研究背景,基于强度折减法和实测统计方法确定了分步施工方法下围岩变形控制值。结果表明:(1)采用三台阶法时的变形基准值为-35.5 mm,采用双侧壁导坑法时的变形基准值为-30.5 mm,施工方法对围岩扰动程度会影响围岩变形基准值;(2)由52个断面沉降监测的统计结果可知,下北山隧道的围岩稳定沉降区间为20~30 mm,与得到的变形基准控制值基本一致。研究结果可为类似隧道施工期监测预警体系的制定提供参考。To determine the reference value of surrounding rock deformation in shallow buried large-span four-track tunnels,a dynamic reference value system for surrounding rock deformation under sequential excavation method(SEM)is established,taking the ultimate safety factor of the initial support structure as the criterion.Taking Xiabeishan four-track tunnel as the research background,the control value of surrounding rock deformation under SEM is determined by using strength reduction method and actual measurement statistical method.The results show that:(1)the deformation reference value when using the three-bench method is-35.5 mm,and the deformation reference value when using the double side drift method is-30.5 mm.The construction method affects the reference value of surrounding rock deformation by varying the degree of disturbance to the surrounding rock.(2)According to the statistical results of settlement monitoring of 52 sections,the stable settlement range of the surrounding rock in the Xiabeishan Tunnel is 20~30 mm,which is basically consistent with the obtained deformation reference control value.The research results can provide reference for the development of monitoring and early warning systems during the construction period of similar tunnels.

关 键 词：超大跨四线隧道 变形控制基准值 初期支护极限安全系数 强度折减法 

分 类 号：U452.12[建筑科学—桥梁与隧道工程]