ISSN 2096-4498

   CN 44-1745/U

二维码

An Improved Raiseboring Method for Hardrock Deep Vertical Shaft and Discussion on Determination of Surrounding Rock Pressure

  • GUO Jilin ,
  • ZHANG Junru ,
  • LI Xiaogang ,
  • LI Hongtao
Expand
  • (1. The 4th Engineering Co., Ltd. of China Railway 12th Bureau Group, Xi’an 710021, Shaanxi, China;  2. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China)

Received date: 2015-11-11

  Revised date: 2015-12-11

  Online published: 2016-05-25

Abstract

The diameterdepth ratio of ventilation vertical shaft of Guantian Tunnel on ZhangzhouYongan Expressway in Fujian is small. As a result, the conventional raiseboring method is improved; the conventional drill bit of raiseboring drill is replaced by air DTH hammer; and then the pressurereducetyped boring mode is adopted. The gradient of guiding hole is reduced; the drill bit abrasion is reduced; rapid construction of vertical shaft is achieved; and a series of raiseboring methods (with diameterdepth ratio less then 1.3%) for hardrock deep vertical shaft is obtained. Meanwhile, the horizontal pressure of surrounding rock of hardrock deep vertical shaft is measured by means of automatic monitoring technology and wireless transmission technology. The measured results (0.01-0.03 MPa) are 24%-46% of the values in related criteria and are independent of depth. The authors suggest that the surrounding rock pressure should be further improved.

Cite this article

GUO Jilin , ZHANG Junru , LI Xiaogang , LI Hongtao . An Improved Raiseboring Method for Hardrock Deep Vertical Shaft and Discussion on Determination of Surrounding Rock Pressure[J]. Tunnel Construction, 2016 , 36(5) : 585 -591 . DOI: 10.3973/j.issn.1672-741X.2016.05.014

Outlines

/

〈 〉