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隧道建设(中英文) ›› 2018, Vol. 38 ›› Issue (1): 91-102.DOI: 10.3973/j.issn.2096-4498.2018.01.012

• 施工技术 • 上一篇    下一篇

特大跨度四线深埋隧道施工工法研究——以乌蒙山2号出口车站隧道为例

卿伟宸1, 高杨1, 朱勇1, 章慧健2   

  1. (1. 中铁二院工程集团有限责任公司, 四川 成都 610031; 2. 西南交通大学, 四川 成都 610031)
  • 收稿日期:2017-07-17 修回日期:2017-10-31 出版日期:2018-01-20 发布日期:2018-02-01
  • 作者简介:卿伟宸(1981—),男,四川成都人,2006年毕业于西安交通大学,岩土工程专业,硕士,高级工程师,现从事隧道设计工作。Email: 33635115@qq.com。

Construction Methods for Ultra Largespan Fourtrack Deep Tunnel on Wumengshan No. 2 Exit Section

QING Weichen1, GAO Yang1, ZHU Yong1, ZHANG Huijian2   

  1. (1. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, Sichuan, China;  2. Southwest Jiaotong University, Chengdu 610031, Sichuan, China)
  • Received:2017-07-17 Revised:2017-10-31 Online:2018-01-20 Published:2018-02-01

摘要:

针对特大跨度四线铁路隧道,其开挖面积相当于6倍普通单线铁路隧道,开挖成洞难度大,尚无成功先例。以六(盘水)沾(益)铁路乌蒙山2号出口四线车站隧道工程为背景,通过数值模拟和现场监测,开展特大跨度隧道施工工法研究。研究结果表明: 1)通过“撑索转换”,即利用“外锚”替换“内撑”,实现拱部临时支撑的安全拆除,降低拱部支护体系转换过程中的施工风险,并且突破传统软岩隧道施工中拆撑步长、跳拆等限制,提高了拆撑安全性及灵活性,同时为后续施工提供了较大的工作面。2)通过“以索代撑”,即利用锚索取代临时横撑,避免临时撗撑拆除风险,使得开挖更加灵活。3)采用三台阶“撑索转换”及“以索代撑”施工工法,实现了特大跨度隧道台阶法施工。

关键词: 深埋铁路隧道, 特大跨度, 施工工法, 撑索转换, 以索代撑, 数值模拟, 现场监测

Abstract:

The construction of ultra largespan fourtrack tunnel, of which the excavation area equals to 6 times of that of traditional singletrack railway tunnel, is difficult; and there is no successful precedent. The construction methods for ultra largespan fourtrack deep tunnel on Wumengshan No. 2 exit section on LiupanshuiZhanyi Railway are studied by numerical simulation and site monitoring methods. The results show that: 1) By using temporary support replaced by prestressed anchor, the temporary support of arch is successfully dismantled, the replacing construction risk of arch is reduced; the disadvantages of traditional soft rock tunnel construction are overcome; the safety and flexibility of support dismantling are improved; and large working face can be provided for followed construction step. 2) By using temporary crossbrace replaced by prestressed anchor cable, the temporary crossbrace dismantling risk is avoided; and the construction flexibility is improved. 3) The threebench excavation of ultra largespan tunnel is realized by using temporary support replaced by prestressed anchor and temporary crossbrace replaced by prestressed anchor cable.

Key words: deep railway tunnel, ultra largespan, construction method, temporary support replaced by prestressed anchor, temporary crossbrace replaced by prestressed anchor cable, numerical simulation, site monitoring

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