Journal
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
Volume 53, Issue -, Pages 129-141Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijrmms.2012.05.001
Keywords
Rock mass; Dynamic response; Blasting; In-situ stress; Transient release
Funding
- Chinese National Programs for Fundamental Research and Development (973Program) [2010CB732003, 2011CB013501]
- Chinese National Science Fund for Distinguished Young Scholars [51125037]
- Chinese National Natural Science Foundation [50909077, 51179138]
- Academic Award Nominee for Excellent PhD Candidates
- Wuhan University [T2011206009]
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During the excavation of rock mass with the method of drill and blast, the release of in-situ stress, also known as excavation load on boundary, is traditionally assumed as a quasi-static process, so the inertia and all other dynamic responses induced by the release of in-situ stress can be ignored. After analyzing the process of release of in-situ stress induced by rock mass excavation with the method of drill and blast and determining the duration of the release of in-situ stress, it is found that the release of in-situ stress induced strain rate can reach a magnitude of 10(-1)-10(1)/s or higher if the initial in-situ stress has a level of 20-50 MPa, it implies that the release of in-situ stress is a transient process, and the transient character of the release of in-situ stress and correspondingly induced dynamic response of surrounding rock should be taken into account together with excavation. Problems such as the determination of redistributed in-situ stress corresponding to initiation sequences of millisecond delays, the way and path of the transient release of in-situ stress, transient release of in-situ stress induced vibration and comparison with blasting induced vibration are also discussed in this paper. Finally, a case of in-situ stress release induced vibration in Pubugou hydropower projects are presented as verifications. (C) 2012 Elsevier Ltd. All rights reserved.
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