Experiment of explosive consumption by blasting pretreated boulders with overlying stratum of rock-soil

Zhang Qingbin; Yang Junsheng; Wu Congshi; Zhang Xuemin; Liang Kuisheng; Liu Hongzhen; Fang Fenghua

doi:10.11883/1001-1455(2016)05-0695-08

Volume 36 Issue 5

Oct. 2018

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Zhang Qingbin, Yang Junsheng, Wu Congshi, Zhang Xuemin, Liang Kuisheng, Liu Hongzhen, Fang Fenghua. Experiment of explosive consumption by blasting pretreated boulders with overlying stratum of rock-soil[J]. Explosion And Shock Waves, 2016, 36(5): 695-702. doi: 10.11883/1001-1455(2016)05-0695-08

Citation:

Zhang Qingbin, Yang Junsheng, Wu Congshi, Zhang Xuemin, Liang Kuisheng, Liu Hongzhen, Fang Fenghua. Experiment of explosive consumption by blasting pretreated boulders with overlying stratum of rock-soil[J]. Explosion And Shock Waves, 2016, 36(5): 695-702. doi: 10.11883/1001-1455(2016)05-0695-08

Citation:

Zhang Qingbin, Yang Junsheng, Wu Congshi, Zhang Xuemin, Liang Kuisheng, Liu Hongzhen, Fang Fenghua. Experiment of explosive consumption by blasting pretreated boulders with overlying stratum of rock-soil[J]. Explosion And Shock Waves, 2016, 36(5): 695-702. doi: 10.11883/1001-1455(2016)05-0695-08

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Experiment of explosive consumption by blasting pretreated boulders with overlying stratum of rock-soil

doi: 10.11883/1001-1455(2016)05-0695-08

1.
School of Civil Engineering and Architecture, Changsha University of Science and Technology, Changsha 410004, Hunan, China
2.
School of Civil Engineering, Central South University, Changsha 410075, Hunan, China
3.
Intake Tunnel Project of Taishan Nuclear Power Station, Department of China Railway Tunnel Stock Co., LTD, Taishan 529228, Guangdong, China
4.
China Railway Tunnel Group Research Institute, Luoyang 471009, Henan, China
5.
Yichang Part and Channel Administrative Bureau, Yichang 443000, Hubei, China

Received Date: 2014-11-10
Rev Recd Date: 2015-06-30
Publish Date: 2016-09-25

Abstract

Abstract

During the tunneling construction in hard granite strata utilizing shield machines, pretreatment of boulders by blasting was commonly used to prevent the abrading cutter from serious damages and reduce construction risks, but the explosive consumption was usually determined based on empirical formula, resulting in that the blasting effect was often far from satisfactory. In the present work, aiming to meet the special requirement that rock fragments from the blasting should be less than 30 cm in practice, we investigate the explosive consumption using a model test of blasting. The results show that the explosive consumption of land blasting is 5.4-6.5 times that of conventional blasting when the requirement of rock fragmentation is satisfied; the explosive consumption increases linearly with the depth of overlying stratum; and the explosive consumption of model test was 3.4-4.9 times that of the empirical formula. Thus, the revised empirical formula is derived and proved valid based on the on-the-site practice. The revised formula can serve as calculation basis and reference value for similar projects of tunneling construction.
- mechanics of explosion,
- explosive consumption,
- blasting,
- boulder,
- shield,
- pre-treatment,
- model experiment

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References(17)

References

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