Model experimental studies of vibration effect and damage evolution of tunnel's surrounding rock under cyclic blasting excavation

Zhong Guosheng; Ao Liping; Fu Yuhua

doi:10.11883/1001-1455(2016)06-0853-08

Volume 36 Issue 6

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Zhong Guosheng, Ao Liping, Fu Yuhua. Model experimental studies of vibration effect and damage evolution of tunnel's surrounding rock under cyclic blasting excavation[J]. Explosion And Shock Waves, 2016, 36(6): 853-860. doi: 10.11883/1001-1455(2016)06-0853-08

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Zhong Guosheng, Ao Liping, Fu Yuhua. Model experimental studies of vibration effect and damage evolution of tunnel's surrounding rock under cyclic blasting excavation[J]. Explosion And Shock Waves, 2016, 36(6): 853-860. doi: 10.11883/1001-1455(2016)06-0853-08

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Model experimental studies of vibration effect and damage evolution of tunnel's surrounding rock under cyclic blasting excavation

doi: 10.11883/1001-1455(2016)06-0853-08

1.
School of Architecture and Civil Engineering, Huizhou University, Huizhou 516007, Guangdong, China
2.
College of Applied Science, Jiangxi University of Science and Technology Ganzhou 341000, Jiangxi, China

Received Date: 2015-03-25
Rev Recd Date: 2015-06-26
Publish Date: 2016-11-25

Abstract

Abstract

In this work, based on the similarity theory, we conducted a model experiment to study the vibration effect and damage evolution of rocks surrounding a tunnel in push-type cyclic blasting excavation. The model was constructed with a ratio of 1: 15. By simulating the tunnel excavation of push-type cyclic blasting, we explored the influence of the change of blasting parameters on the vibration effect. The degree of the damage of the surrounding rock was evaluated by the change of the acoustic velocity at the same measuring point after blasting. The relationship between the damage evolution of the surrounding rock and the times of blasting was established. We arrived at the following results: (1) When the maximum section dose was about the same, the influence of the initiation section number on the dielectric coefficient (K) of Sodev formula was very small, but it was great on the attenuation coefficient of Sodev formula; (2) In push-type cyclic blasting excavation, there was a great difference in the decrease rates of the acoustic velocity among the measuring points with the same distance to the blasting region at the same depth, and the blasting damage ranges of the surrounding rock were typically an isotropic in terms of both depth and width; (3) When the blasting parameters were basically the same, the growth trend of the cumulative acoustic velocity's decrease rate at the measuring point was nonlinear in different cyclic blasting excavation; (4) There were nonlinear evolution characteristics between the blasting cumulative damage (D) of the surrounding rock and the times of blasting (n) under push-type cyclic blasting loading, and different measuring points had different blasting cumulative damage propagation models. The closer the measuring point was to the explosion source, the faster the cumulative damage extension. Blasting cumulative damage effect of the surrounding rock had typically nonlinear evolution properties and anisotropic characteristics.
- mechanics of explosion,
- vibration effect,
- model experiment,
- tunnel excavation,
- cyclic blasting load,
- surrounding rock damage

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References(17)

References

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