Study of the Growth Process of Original Crack in the Surrounding Rock of Tunnel under the Adjacent Explosive Load

Joint Authors

Liu, Kang
Guo, Dongming
Kang, Xinchao
Zhang, Jun

Source

Shock and Vibration

Issue

Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-8, 8 p.

Publisher

Hindawi Publishing Corporation

Publication Date

2020-01-08

Country of Publication

Egypt

No. of Pages

8

Main Subjects

Civil Engineering

Abstract EN

The surrounding rock damage of a tunnel under adjacent explosive load is often manifested as the growth of the original crack.

In order to thoroughly understand the crack growth mechanism, in this study, the growth process of the original crack was investigated in detail by the dynamic caustics experiment.

The experimental study shows that the growth of original crack is the result of the combined action of explosion stress wave and explosive gas.

The quasi-static stress generated by the explosive gas was superimposed on the weakened stress field, resulting in the formation of the peak of the main stress difference in the surrounding rock, moving towards the adjacent tunnel in the form of an arc wave.

With the arc wave moving towards the original crack, the growth rate of the original crack increases rapidly.

During the period of 200 μs to 250 μs, the crack growth rate oscillates at the peak, and its size is approximately equal to the moving speed of the arc wave.

Based on the experimental results and microscopic damage mechanics, the high stress concentration at the original crack tip under the stress wave first causes damage localization and the weakest chain is formed by the penetration of the damage localization zones by microcracks by special distribution law.

Subsequently, the original crack starts to initiate and grow along the direction of the weakest chain.

American Psychological Association (APA)

Liu, Kang& Guo, Dongming& Kang, Xinchao& Zhang, Jun. 2020. Study of the Growth Process of Original Crack in the Surrounding Rock of Tunnel under the Adjacent Explosive Load. Shock and Vibration،Vol. 2020, no. 2020, pp.1-8.
https://search.emarefa.net/detail/BIM-1210392

Modern Language Association (MLA)

Liu, Kang…[et al.]. Study of the Growth Process of Original Crack in the Surrounding Rock of Tunnel under the Adjacent Explosive Load. Shock and Vibration No. 2020 (2020), pp.1-8.
https://search.emarefa.net/detail/BIM-1210392

American Medical Association (AMA)

Liu, Kang& Guo, Dongming& Kang, Xinchao& Zhang, Jun. Study of the Growth Process of Original Crack in the Surrounding Rock of Tunnel under the Adjacent Explosive Load. Shock and Vibration. 2020. Vol. 2020, no. 2020, pp.1-8.
https://search.emarefa.net/detail/BIM-1210392

Data Type

Journal Articles

Language

English

Notes

Includes bibliographical references

Record ID

BIM-1210392