Rockbursts and Seismicity in Mines 97
Rockbursts and Seismicity in Mines 97

Author: S.J. Gibowicz

Publisher: CRC Press

Published: 1997-01-01

Total Pages: 0

ISBN-13: 9789054108900

DOWNLOAD EBOOK

This volume contains 6 keynote lectures and 63 technical papers on the subject, written by experts from 15 countries. 5 themes are explored: Mechanism of seismic events and rockbursts, monitoring of seismicity; Geology, mining and seismicity; Rockburst hazard assessment and ground control; and Induced seismicity and laboratory experiments. Scientists and engineers brought together to Krakow from around the world have discussed the latest developments in theoretical and experimental understanding of rockbursts and related seismic events, and practical procedures to mitigate their effects. This proceedings volume is essential reading for anyone concerned with ground control in mining and for geoscientists seeking a new insight into earthquake mechanics.

Rockbursts and Seismicity in Mines 93
Rockbursts and Seismicity in Mines 93

Author: R. Paul Young

Publisher: CRC Press

Published: 1993-01-01

Total Pages: 472

ISBN-13: 9054103205

DOWNLOAD EBOOK

These proceedings include the latest developments in research and practice in the area of mining-induced seismicity. Three themes are explored: strong ground motion and rockburst hazard; mechanics of seismic events and stochastic methods; and monitoring of seismicity and geomechanical modelling.

Rockbursts and Seismicity in Mines 97
Rockbursts and Seismicity in Mines 97

Author: S.J. Gibowicz

Publisher: CRC Press

Published: 1997-01-01

Total Pages: 450

ISBN-13: 9789054108900

DOWNLOAD EBOOK

This volume contains 6 keynote lectures and 63 technical papers on the subject, written by experts from 15 countries. 5 themes are explored: Mechanism of seismic events and rockbursts, monitoring of seismicity; Geology, mining and seismicity; Rockburst hazard assessment and ground control; and Induced seismicity and laboratory experiments. Scientists and engineers brought together to Krakow from around the world have discussed the latest developments in theoretical and experimental understanding of rockbursts and related seismic events, and practical procedures to mitigate their effects. This proceedings volume is essential reading for anyone concerned with ground control in mining and for geoscientists seeking a new insight into earthquake mechanics.

Seismicity in Mines
Seismicity in Mines

Author: G. Gibowicz

Publisher: Birkhäuser

Published: 2012-12-06

Total Pages: 391

ISBN-13: 3034892705

DOWNLOAD EBOOK

Recent seismological research has focused on processes other than pure shear failure (double-couple) as an alternative mechanism for some types of seismic events. This has been stimulated by what appears to be anomalous focal mecha nisms observed for several earthquakes of possible volcanic nature in the 1980 Mammoth Lakes, California sequence (JULIAN and SIPKIN, 1985; SIPKIN, 1986). Although studies have concentrated on earthquakes associated with magmatic processes, possible non-double-couple seismic failure has been observed, but not widely known, in cases of mine seismicity in the past three decades. Such cases have occurred on a world-wide basis; however, no cases until now have been observed in the United States. The existence of non-double-couple failure in mine seismicity has been controversial as it has been for tectonic/volcanic earthquakes. Several of the benchmark studies of mine seismicity in the deep South African gold mines have resulted in the belief that no fundamental distinction in the source mechanism exists between tectonic earthquakes and rock bursts (MCGARR, 1984); both types of events are the result of pure shear failure. However, the reported cases of implo sional focal mechanisms for mine seismicity continue to increase in number and prolong the controversy. During the summer of 1984, a three-dimensional, high resolution micro earthquake network was operated by Woodward-Clyde Consultants (WCC) in the vicinity of two coal mines beneath Gentry Mountain in the eastern Wasatch Plateau of central Utah.

A Survey of Mining Associated Rockbursts
A Survey of Mining Associated Rockbursts

Author: Janet C. Johnston

Publisher:

Published: 1988

Total Pages: 66

ISBN-13:

DOWNLOAD EBOOK

Parameters related to rockbursts, specifically types of ore, mining operation, magnitude-frequency statistics, maximum magnitudes, depths, and presence of precursory phenomena, are compiled for various tectonic/geologic regions. Data from Canada, the United States, Great Britain, Sweden, West Germany, Poland, Czechoslovakia, South Africa, the USSR, China, Japan, and Australia are tabulated and sorted according to type of geologic conditions. Similarities and differences in source characteristics between rockbursts and natural crustal earthquakes are examined and classified. Type I rockbursts are directly related to an advancing mine face; Type II events involve induced movement along preexisting fault planes. Reliability of prediction of the maximum size of rockbursts based upon mine area, excavation rate, geology, and extent of fracturing of adjacent rock is assessed with special focus on consistency between different areas of the world. The number of Type I rockbursts is found to be a direct function of excavation rate; their locations are consistently determined by location of the mine face and by local geological structure. When Type I events results in new fracture planes, high stress drops result. It is possible that an inactive fault can be activated by the presence of a mine, resulting in Type II rockbursts. Search for reliable precursory phenomena has been unsuccessful. The upper limit for Type I events seems to be controlled by the strength of the rock, whereas the upper limit for Type II events is a completely open question at this time.