ISSN 2096-4498
CN 44-1745/U
ISSN 2096-4498
CN 44-1745/U
An Improved Raiseboring Method for Hardrock Deep Vertical Shaft and Discussion on Determination of Surrounding Rock Pressure
Received date: 2015-11-11
Revised date: 2015-12-11
Online published: 2016-05-25
The diameterdepth ratio of ventilation vertical shaft of Guantian Tunnel on ZhangzhouYongan Expressway in Fujian is small. As a result, the conventional raiseboring method is improved; the conventional drill bit of raiseboring drill is replaced by air DTH hammer; and then the pressurereducetyped 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 raiseboring methods (with diameterdepth ratio less then 1.3%) for hardrock deep vertical shaft is obtained. Meanwhile, the horizontal pressure of surrounding rock of hardrock 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.
GUO Jilin , ZHANG Junru , LI Xiaogang , LI Hongtao . An Improved Raiseboring Method for Hardrock 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
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