摘要
为验证重载铁路黄土隧道初期支护推广应用格栅钢架的可靠性,通过全环格栅钢架混凝土1∶1模型试验,现场初期支护变形收敛、围岩压力、格栅钢架和喷射混凝土力学性能测试,以及基于大数据的初期支护变形收敛数据统计分析等方法进行研究。研究结果表明:1)全环格栅钢架混凝土结构表现出较高的承载能力兼顾较大的变形协调能力,H180型格栅钢架混凝土结构在极限状态下可承载相当于32.56 m的黄土自重;2)格栅钢架可应用于Ⅳ、Ⅴ级围岩大跨度黄土隧道,能保证围岩稳定及初期支护结构的安全;3)大跨度黄土隧道初期支护采用格栅钢架,初期支护拱顶下沉及水平收敛值控制良好,总体在开挖预留变形量控制值内。
To test the reliability of the grid-steel frame applied in primary support of loess tunnel of the heavy-haul railway,a 1∶1 model test of full-ring grid-steel frame-concrete structure is conducted,the deformation convergence of primary support,surrounding rock pressure,and mechanical property test of grid-steel frame and shotcrete are analyzed,and statistical analysis of deformation convergence data of primary support based on big data is studied.The study results show the following:(1)The full-ring grid-steel frame-concrete structure has a high bearing capacity and large deformation coordination capacity.The H180 grid-steel frame-concrete structure can bear the loess weight equivalent of the loess stratum with a depth of 32.56 m under the limit state.(2)The grid-steel frame can be applied to a large-span loess tunnel with GradeⅣandⅤsurrounding rocks,which ensures the stability of the surrounding rock and the safety of the primary support structure.(3)The grid-steel frame is used in the primary support of a large-span loess tunnel,and the crown settlement and horizontal convergence are well controlled,which are generally within the control values of excavation reserved deformation.
作者
皮圣
PI Sheng(Sichuan-Tibet Railway Co.,Ltd.,Chengdu 610043,Sichuan,China)
出处
《隧道建设（中英文）》
CSCD
北大核心
2021年第4期604-612,共9页
Tunnel Construction
基金
蒙华重载铁路隧道建造技术资助项目(HJHTFW[2020]0025)。
关键词
重载铁路
黄土隧道
格栅钢架
力学测试
变形收敛
初期支护
heavy-haul railway
loess tunnel
grid-steel frame
mechanical test
deformation convergence
primary support
作者简介
皮圣(1990-),男,湖南湘乡人,2016年毕业于中南大学,隧道与地下工程专业,硕士,工程师,现从事隧道与地下工程技术管理与研究工作。E-mail:1078206964@qq.com。
