铁路隧道初期支护混凝土平整度试验研究  

Experimental Study on the Flatness of Concrete for Initial Support of Railway Tunnels

作　　者：王胜国[1] WANG Shengguo(China Railway 19th Bureau Group Co.Ltd.,Beijing 100176,China)

机构地区：[1]中铁十九局集团有限公司,北京100176

出　　处：《铁道建筑技术》2024年第6期30-32,131,共4页Railway Construction Technology

基　　金：中铁十九局集团有限公司科技研究开发项目(2023-A08)。

摘　　要：文章以成达万铁路太蓬山隧道为例,开展初期支护喷射混凝土平整度相关试验研究,得出如下结论:(1)边墙喷射风压0.4 MPa、喷射距离1.5 m时,回弹率最低、平整度最高。(2)拱部喷射风压0.4 MPa、喷射距离1.5 m时,回弹率最低;拱部喷射风压0.4 MPa、喷射距离1.8 m时,平整度最高。(3)拱部平整度低于边墙平整度。(4)边墙最优施工参数为喷射风压0.35~0.4 MPa、喷射距离1.2~1.5 m,此时回弹率、平整度匹配度最高。(5)拱部最优施工参数为喷射风压0.4~0.45 MPa、喷射距离1.5~1.8 m,此时回弹率、平整度匹配度最高。(6)喷射路线建议使用上下式和往复式。(7)总结的“211”喷射混凝土新工艺,可使混凝土表面平整度更好、更美观。Taking the Taipengshan Tunnel of Chengdu-Dazhou-Wanzhou High-speed Railway as an example,this paper carries out experimental research on the flatness of shotcrete for initial support,and draws the following conclusions:(1)When the working wind pressure of the side wall is 0.4 MPa and the spraying distance is 1.5 m,the rebound rate is the lowest,and the flatness is the highest.(2)When the working wind pressure of the arch is 0.4 MPa and the spray distance is 1.5 m,the rebound rate is the lowest,and the flatness is the highest when the working wind pressure of the side wall is 0.4 MPa and the spray distance is 1.8 m.(3)The flatness of the arch is lower than the flatness of the side wall.(4)The optimal parameters of the side wall are the jet wind pressure of 0.35-0.4 MPa and the spraying distance of 1.2-1.5 m,and the rebound rate and flatness match are the highest.(5)The optimal parameters of the arch are the jet wind pressure of 0.4-0.45 MPa and the spraying distance of 1.5-1.8 m,and the rebound rate and flatness match are the highest.(6)It is recommended to use up and down and reciprocating types for the spray route.(7)The new process of“211”shotcrete summarized makes the surface flatness of concrete better and more beautiful.

关 键 词：隧道初期支护 平整度 喷射压力 喷射距离 喷射路线 “211”喷射工艺 

分 类 号：U456[建筑科学—桥梁与隧道工程] U451.4[交通运输工程—道路与铁道工程]