Overbreak/shortbreak Control Technology for and Cost Analysis on Rock Tunnels Constructed by Drilling and Blasting Method: Case Study on Tunnels on JiujiangRuichang Highway

doi:10.3973/j.issn.1672-741X.2012.06.024

Tunnel Construction ›› 2012, Vol. 32 ›› Issue (6): 887-891.DOI: 10.3973/j.issn.1672-741X.2012.06.024

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Overbreak/shortbreak Control Technology for and Cost Analysis on Rock Tunnels Constructed by Drilling and Blasting Method: Case Study on Tunnels on JiujiangRuichang Highway

FENG Haibao^1，2, JIANG Wande¹, QU Lili¹, GUO Qingjie³

(1. The Second Engineering Co., Ltd., of CCCC First Harbor Engineering Co., Ltd., Qingdao 266071, Shandong, China; 2. Shandong University, Jinan 250101, China;3. General Contract Branch of CCCC First Harbor Engineering Co., Ltd., Tianjin 300461, China)

Received:2012-07-16 Revised:2012-08-03 Online:2012-12-20 Published:2012-12-28

Abstract

Abstract: The stateofart of overbreak/shortbreak in tunneling is presented, the causes for overbreak/shortbreak are analyzed, and the influences of overbreak/shortbreak on the tunneling cost are described, so as to reduce the cost induced by overbreak/shortbreak of rock tunnels constructed by drilling and blasting method and to improve the qualification rate of tunnel excavation. Effective overbreak/shortbreak control technologies are determined on basis of investigations and trials. After these technologies are applied, the average qualification rate in tunnel excavation has been raised from 67.4% to 83.9%, and the economic efficiency has been improved by 49.9%, which demonstrates that the technologies applied are effective. The paper can provide reference for similar projects in the future.

Key words: JiujiangRuichang highway, rock tunnel, drilling and blasting method, overbreak/shortbreak, control technology, cost

FENG Haibao, JIANG Wande, QU Lili, GUO Qingjie. Overbreak/shortbreak Control Technology for and Cost Analysis on Rock Tunnels Constructed by Drilling and Blasting Method: Case Study on Tunnels on JiujiangRuichang Highway[J]. Tunnel Construction, 2012, 32(6): 887-891.

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Overbreak/shortbreak Control Technology for and Cost Analysis on Rock Tunnels Constructed by Drilling and Blasting Method: Case Study on Tunnels on JiujiangRuichang Highway

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