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施工技术

桃树坪隧道穿越富水粉细砂地层双导洞超前法施工技术

  • 张学文
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  • (中国铁建大桥工程局集团有限公司兰渝铁路工程指挥部, 甘肃陇南 748500)
张学文(1977—),男,甘肃漳县人,2001年毕业于辽宁工程技术大学,采矿工程专业,本科,高级工程师,主要从事工程管理和技术开发方面的研究工作。Email: 854271109@qq.com。

收稿日期: 2015-03-26

  修回日期: 2016-02-27

  网络出版日期: 2016-05-25

Advanced Doubledrift Construction Technologies for Taoshuping Tunnel Crossing Waterrich Fine Silty Sand Strata

  • ZHANG Xuewen
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  • (Headquarters of LanzhouChongqing Railway Project, China Railway Construction Bridge Engineering Bureau Group Co., Ltd., Longnan 748500, Gansu, China)

Received date: 2015-03-26

  Revised date: 2016-02-27

  Online published: 2016-05-25

摘要

在建兰渝铁路桃树坪隧道为Ⅰ级铁路双线隧道,施工穿越上第三系富水粉细砂地层。为了解决由于出水量大,岩性软,成岩作用及稳定性差,在隧道开挖过程中,含水粉细砂层软化现象明显,常呈流塑状,无自稳性,造成大断面隧道施工极其困难的问题,结合桃树坪隧道3#斜井正洞围岩特点研究采用了双导洞超前法施工,通过导洞超前降水、先行稳固拱脚,解决了富水粉细砂层大断面隧道开挖困难、初期支护变形严重难以控制的问题。

本文引用格式

张学文 . 桃树坪隧道穿越富水粉细砂地层双导洞超前法施工技术[J]. 隧道建设, 2016 , 36(5) : 577 -584 . DOI: 10.3973/j.issn.1672-741X.2016.05.013

Abstract

Taoshuping tunnel on LanzhouChongqing Railway is a Grade Ⅰ doubleline railway tunnel; it crosses waterrich fine silty sand strata. The surrounding rocks of the tunnel are bad and unstable. During the construction of Taoshuping Tunnel, large water inrush and softening of waterrich fine silty sand strata occur. As a result, doubledrift method is adopted to carry out drainage construction. The technical problem of the excavation of tunnel crossing waterrich fine silty sand strata has been solved and the deformation of primary support has been brought under effective control.

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