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隧道建设(中英文) ›› 2018, Vol. 38 ›› Issue (6): 1029-1036.DOI: 10.3973/j.issn.2096-4498.2018.06.020

• 施工技术 • 上一篇    下一篇

淤泥地层暗挖矩形隧道密贴雨水箱涵施工关键技术

许俊伟   

  1. (中铁隧道勘察设计研究院有限公司, 广东 广州 511400)
  • 收稿日期:2018-03-13 修回日期:2018-05-15 出版日期:2018-06-20 发布日期:2018-07-04
  • 作者简介:许俊伟(1983—),男,河南洛阳人,2007年毕业于重庆交通大学,土木工程专业,本科,工程师,现从事城市轨道交通工程施工和监控量测技术研究工作。 Email: 280918519@qq.com。

Key Construction Technologies for Rectangular Mined Tunnel in Silt Adjacent to Rainwater Box Culvert

XU Junwei   

  1. (China Railway Tunnel Consultants Co., Ltd., Guangzhou 511400, Guangdong, China)
  • Received:2018-03-13 Revised:2018-05-15 Online:2018-06-20 Published:2018-07-04

摘要:

为解决富水淤泥质地层和粉质黏土层中大跨径矩形暗挖隧道密贴下穿雨水箱涵施工难题,提出采用水平旋喷桩和全断面帷幕注浆结合的技术加固隧道及周边土层,以提高地层刚度。隧道采用分步开挖法,分上下、左中右6步开挖,超前支护采用小导管注浆方案,并分段进行临时支撑拆除和二次衬砌施工,施工过程中对隧道和箱涵变形进行监测。结果表明: 通过水平旋喷桩和全断面帷幕注浆加固改良土体,施工过程中的箱涵变形在可控范围内,且整个施工过程中隧道初期支护结构变形较小(6.8 mm),说明施工采用的超前加固和开挖支护措施是安全可靠的,可以有效降低类似地质条件下暗挖隧道的施工风险,对类似工程有一定的借鉴意义。

关键词: 淤泥质地层, 暗挖隧道, 水平旋喷桩, 全断面帷幕注浆, 分步开挖

Abstract:

The construction of longspan rectangular mined tunnel adjacent to rainwater box culvert in waterrich silt and silty clay stratum is always difficult. Hence, the combined technology of horizontal jet grouting pile and fullsection curtain grouting is proposed to consolidate the tunnel and surrounding soil to increase the formation stiffness. The tunnel excavation is divided into 6 parts by using benching method. The small duct grouting is used for advanced support; and the dismantling of temporary supports and construction of secondary lining are carried out in sections. During the construction, the deformations of the tunnel and box culvert are monitored. The results show that soil consolidation and conditioning by using horizontal jet grouting pile and fullsection curtain grouting can make the deformation of box culvert under control, and the deformation of primary support structure is small (6.8 mm) during construction, so as to show the feasibility of the advanced reinforcement and excavation and supporting measures; and also can effectively reduce the risk of mined tunnel construction under similar geological conditions. The results can provide reference for similar projects in the future.

Key words: silt, mined tunnel, horizontal jet grouting pile, fullsection curtain grouting, benching method

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