Model experiment to study cumulative damage effects of young shotcrete under blasting load

Shan Renliang; Huang Bo; Geng Huihui; Bai Yao; Yan Fayuan

doi:10.11883/1001-1455(2016)03-0289-08

Volume 36 Issue 3

Oct. 2018

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Shan Renliang, Huang Bo, Geng Huihui, Bai Yao, Yan Fayuan. Model experiment to study cumulative damage effects of young shotcrete under blasting load[J]. Explosion And Shock Waves, 2016, 36(3): 289-296. doi: 10.11883/1001-1455(2016)03-0289-08

Citation:

Shan Renliang, Huang Bo, Geng Huihui, Bai Yao, Yan Fayuan. Model experiment to study cumulative damage effects of young shotcrete under blasting load[J]. Explosion And Shock Waves, 2016, 36(3): 289-296. doi: 10.11883/1001-1455(2016)03-0289-08

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Model experiment to study cumulative damage effects of young shotcrete under blasting load

doi: 10.11883/1001-1455(2016)03-0289-08

School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China

Received Date: 2014-09-28
Rev Recd Date: 2014-10-29
Publish Date: 2016-05-25

Abstract

Abstract

In this work we simulated the blasting excavation in a mine tunnel using a model test. Adopting the sound wave test method, we investigated the cumulative damage effects of young shotcrete under multiple blasting loads by analyzing variations of acoustic velocity and acoustic waveform during the model test. The results indicate that all the following factors, the times of blasting, the distance between the tunnel face and the test plane, and the dosage of the explosive used as are responsible for the cumulative damage of shotcrete. Their influences are shown both in the acoustic velocity and the acoustic waveform: the more times of blasting, the shorter distance, and the greater explosive dosage, then the greater the reduction value of the acoustic velocity and the more obvious the change of the acoustic waveform, and the greater the cumulative damage value. Specifically, there is a nonlinear relationship between the times of blasting and the cumulative damage. Between the distance and the cumulative damage there also exists a nonlinear relationship, which can be well fitted by a quadratic polynomial. Furthermore, it is found that the first time of blasting affects the acoustic velocity and the acoustic waveform the most, and causes the greatest damage. In general, when the explosive dosage is small, the maximum cumulative damage reaches 0.1268, which indicates that the shotcrete damage close to the blasting area should be the major concern.
- mechanics of explosion,
- cumulative damage,
- model test,
- young shotcrete,
- sound wave test,
- blasting load

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References

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