摘要
为研究高铁隧道过浅埋段采用三台阶临时仰拱法施工下的围岩变形规律,以皇后岭隧道出口浅埋段为研究对象,选取三个典型断面,通过开展现场监测,对比分析不同工况下浅埋段围岩收敛变化规律。分析结果表明,浅埋条件下,隧道开挖支护完成后,拱顶最大下沉量为18.7 mm,水平收敛最大值为9.5 mm,均远小于预留变形量,围岩变形速率在下台阶支护完成5 d后趋于稳定。研究结果表明,高铁隧道过浅埋段采用三台阶临时仰拱法施工方法可行,以I22型钢拱架为核心的支护结构满足围岩控制要求,研究成果可为类似工程提供参考。
In order to study the deformation law of surrounding rock in shallow buried section of high-speed railway tunnel constructed by three-step temporary inverted arch method,the shallow buried section at the outlet of Taijiao highspeed railway Huanghouling tunnel is taken as the research object.Three typical sections are selected,and the convergence law of surrounding rock in shallow buried section under different working conditions is compared and analyzed through on-site monitoring.The results show that after the tunnel excavation and support is completed,the maximum settlement of vault is 18.7 mm and the maximum horizontal convergence is 9.5 mm,which are far less than the reserved deformation.The deformation rate of surrounding rock tends to be stable after 5 days of lower step support.this shows that the three-step temporary inverted arch method is feasible for the shallow buried section of high-speed railway tunnel,and the supporting structure with I22 steel frame as the core meets the requirements of surrounding rock control.The research results provide reference for similar projects.
作者
赵红飞
黄海涛
刘继文
翟朝娇
程桦
曹广勇
ZHAO Hongfei;HUANG Haitao;LIU Jiwen;ZHAI Chaojiao;CHENG Hua;CAO Guangyong(The Fourth Engineering Co.Ltd.of CTCE Group,Hefei 230012,China;Anhui Key Laboratory of Aarchitectural Structure and Underground Engineering,Anhui Jianzhu University,Hefei 230601,China)
出处
《安徽建筑大学学报》
2019年第6期52-55,94,共5页
Journal of Anhui Jianzhu University
基金
国家自然科学基金(51874005)
安徽省自然科学基金资助项目(1708085QE104)
安徽建筑大学科研项目(2019QDZ03)。
关键词
高铁隧道
浅埋
三台阶法
初期支护
围岩变形
high-speed railway tunnel
shallow buried
three-step method
initial support
rock deformation
作者简介
赵红飞(1982-),男,工程师,主要研究方向:围岩控制。
