土工基础

›› 2017, Vol. 31 ›› Issue (6): 682-684.

• 工程实录 • 上一篇    下一篇

薄弱覆盖层隧洞出洞口开挖技术在N-J工程中的应用

王  帆，彭会椿   

  1. （中国葛洲坝集团第三工程公司，西安 710000）
  • 收稿日期:2017-05-18 修回日期:2017-07-19 出版日期:2017-12-20 发布日期:2017-12-27
  • 作者简介:王 帆（1987-），男，助理工程师，研究方向为水利水电施工技术。

Excavation of a Tunnel Exit Portal with Thin Overburden in N--J Project

WANG Fan, PENG Huichun   

  1. (China Gezhouba Third Engineering Co., Ltd., Xi’an 710000)
  • Received:2017-05-18 Revised:2017-07-19 Online:2017-12-20 Published:2017-12-27

摘要： 在隧洞开挖施工中，常采用由山体外往山体内开挖的方式开洞，这需要在洞口处山体开辟出施工平台和入场道路，对洞口处山体扰动极大。在保证设计功能的前提下，N-J水电工程引水调压洞出洞口采取由山体内往山体外贯通的方法进行开洞施工，一方面有效减少了山体扰动，降低了开洞施工的安全风险；另一方面也减小了征地范围和对环境的破坏，降低了施工成本，对类似工程具有借鉴意义。

关键词: N-J工程, 薄弱覆盖层, 出洞口, 开挖技术

Abstract: In the tunnel excavation construction in the mountain area, the conventional excavation sequence is started from the outside of the mountain. The access road and the excavation platform are necessary and these auxiliary facilities are resulted in large disturbance at the portal of the tunnel. A new tunnel excavation method, which is excavated from inside of the tunnel towards the exit, was applied in the water tunnel exit portal in NJ Hydraulic Electricity Project. The advantages of this method are the following: the disturbance to the adjacent area of the exit portal is significantly reduced; the cost for the purchase of the required property around the portal area is reduced; and the construction safety is also improved.

Key words: N-J Project, Thin Overburden, Exit Portal, Tunnel Excavation