Influence of Water Depth on the Range of Crushed Zones and Cracked Zones for Underwater Rock Drilling and Blasting
Publication: International Journal of Geomechanics
Volume 22, Issue 10
Abstract
In this paper, the theoretical radii of the crushed and cracked zones for underwater rock drilling and blasting with coupling charge under different water depths were computed, and the dynamic finite-element software LS-DYNA was employed to simulate the failure zone of underwater rock drilling and blasting. The results show that the ranges of the crushed and cracked zones in the shallow water condition are slightly larger than those in the waterless condition. This is because the strength of the underwater saturated rock mass is lower than that of the rock mass under the waterless condition, which causes a slight increase in the range of the crushed and cracked zones after blasting. With increasing water depth, the effect of water pressure becomes increasingly obvious; in particular, the water pressure inhibits circumferential tensile stress induced by blasting, resulting in a rapid decrease in the range of the cracked zone. According to the simulation results, the peak value of the blasting vibration increases with the water depth because the generation of the cracked zone is inhibited by the action of water pressure; thus, more blasting energy is dissipated in the form of elastic vibration.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant Nos. 51979152 and 51609127), Educational Commission of Hubei Province of China (Project No. T2020005), Open Foundation of Hubei Key Laboratory of Construction and Management in Hydropower Engineering (Project No. 2020KSD01), The Young Top-notch Talent Cultivation Program of Hubei Province. The authors thank all the supporters.
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Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 22 • Issue 10 • October 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Aug 28, 2021
Accepted: Mar 28, 2022
Published online: Jul 20, 2022
Published in print: Oct 1, 2022
Discussion open until: Dec 20, 2022
ASCE Technical Topics:
- Blasting effects
- Construction engineering
- Construction methods
- Continuum mechanics
- Cracking
- Drilling
- Dynamics (solid mechanics)
- Engineering mechanics
- Fracture mechanics
- Geology
- Geomechanics
- Geotechnical engineering
- Motion (dynamics)
- Pressure (type)
- Rock masses
- Rock mechanics
- Rocks
- Solid mechanics
- Special condition construction
- Structural dynamics
- Underwater construction
- Vibration
- Water pressure
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