期刊
ROCK MECHANICS AND ROCK ENGINEERING
卷 46, 期 4, 页码 859-875出版社
SPRINGER WIEN
DOI: 10.1007/s00603-012-0308-0
关键词
Microseism; Transient release of in situ stress; Elastic strain energy; Deep rock mass; Blasting excavation
资金
- Chinese National Programs for Fundamental Research and Development (973 Program) [2010CB732003, 2011CB013501]
- Chinese National Science Fund for Distinguished Young Scholars [51125037]
- Chinese National Natural Science Foundation [50909077, 51179138]
- Wuhan University [T2011206009]
During deep rock mass excavation with the method of drill and blast, accompanying the secession of rock fragments and the formation of a new free surface, in situ stress on this boundary is suddenly released within several milliseconds, which is termed the transient release of in situ stress. In this process, enormous strain energy around the excavation face is instantly released in the form of kinetic energy and it inevitably induces microseismic events in surrounding rock masses. Thus, blasting excavation-induced microseismic vibrations in high-stress rock masses are attributed to the combined action of explosion and the transient release of in situ stress. The intensity of stress release-induced microseisms, which depends mainly on the magnitude of the in situ stress and the dimension of the excavation face, is comparable to that of explosion-induced vibrations. With the methods of time-energy density analysis, amplitude spectrum analysis, and finite impulse response (FIR) digital filter, microseismic vibrations induced by the transient release of in situ stress were identified and separated from recorded microseismic signals during a blast of deep rock masses in the Pubugou Hydropower Station. The results show that the low-frequency component in the microseismic records results mainly from the transient release of in situ stress, while the high-frequency component originates primarily from explosion. In addition, a numerical simulation was conducted to demonstrate the occurrence of microseismic events by the transient release of in situ stress, and the results seem to have confirmed fairly well the separated vibrations from microseismic records.
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