穿越泥石流堆积体隧道防水关键技术研究
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摘要
兰渝铁路仓园单洞双线隧道洞身整体穿越密实性差、呈富水状的泥石流堆积体,最小埋深14m,最大开挖跨度13. 86m,隧道围岩松散破碎、自稳性差,且地表水与地下水发育,渗水现象严重,严重影响施工进度与安全。针对该隧道施工难点,提出穿越泥石流堆积体隧道地表注浆技术及洞内深孔帷幕注浆技术,通过有效堵水、防止地表水下渗达到隔断地下水的目的,保障隧道开挖质量及安全。
The single-hole double-line tunnel of Lanzhou-Chongqing Railway Cangyuan has a poor denseness and muddy debris flow fan. The minimum buried depth of the tunnel is 14 m and the maximum excavation span is 13. 86 m. The surrounding rock of the tunnel is loosely broken and has poor self-stability. The surface water and groundwater are developed,and the water seepage phenomenon is serious,which seriously affects the construction progress and safety. In view of this difficulty in tunnel construction,the surface grouting technology through the debris flow fan tunnel and the deep hole curtain grouting technology in the cave are proposed. To ensure the quality and safety of tunnel excavation by effectively blocking water and preventing underwater seepage.
The single-hole double-line tunnel of Lanzhou-Chongqing Railway Cangyuan has a poor denseness and muddy debris flow fan. The minimum buried depth of the tunnel is 14 m and the maximum excavation span is 13. 86 m. The surrounding rock of the tunnel is loosely broken and has poor self-stability. The surface water and groundwater are developed,and the water seepage phenomenon is serious,which seriously affects the construction progress and safety. In view of this difficulty in tunnel construction,the surface grouting technology through the debris flow fan tunnel and the deep hole curtain grouting technology in the cave are proposed. To ensure the quality and safety of tunnel excavation by effectively blocking water and preventing underwater seepage.
引文
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[2]吴广明.仓园隧道穿越泥石流堆积体施工技术[J].公路隧道,2013(2):50-53.
[3]朱正国,朱永全,吴广明,等.泥石流堆积体隧道基底加固方法及稳定性分析[J].岩土工程学报,2013,35(S2):617-621.
[4]程飞.淤泥质隧道暗挖施工加固方案优化分析[D].西安:长安大学,2018.
[5]邓立平.高速公路隧道工程的帷幕注浆技术要点研究[J].交通世界,2018(27):92-93.
[6]孙振宇,张顶立,房倩,等.基于超前加固的深埋隧道围岩力学特性研究[J].工程力学,2018,35(2):92-104.
[7]彭帅英,李广杰,秦胜伍.泥石流动力过程及沿程侵蚀研究综述[J].人民长江,2017,48(3):53-56.
[8]刘强,陈焘,黄栩.浅埋暗挖地铁隧道施工中采用降水措施引起地表沉降分析[J].城市住宅,2018,25(7):105-107.