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Potential triggers for large earthquakes in open-pit mines:A case study from Kuzbass,Siberia

Deep Underground Science and Engineering 2022年第2期1卷 101-115页

作者： Gevorg Kocharyan Chengzhi Qi Svetlana Kishkina Vladimir Kulikov Sadovsky Institute for Dynamics of Geospheres of Russian Academy of Sciences MoscowRussia Civil and Transportation School Beijing University of Civil Engineering and ArchitectureBeijingChina

The extraction and movement of rock during mining operations is considered a possible trigger for slip along the *** this study,possible anthropogenic causes were analyzed for triggering the earthquake with the local magnitude ofML=6.1(at a depth of 4km just beneath the quarry),in the vicinity of the large coal open-pit mine in *** event was the largest earthquake associated with a quarry(an open pit).A sufficiently deep occurrence of the source testified that seismic vibrations were produced in a dynamic slip along a preexisting and prestressed tectonic *** calculations were conducted of increments of normal and shear stresses at fault planes with several dip angles at depths corresponding to the probable location of the hypocenter of the Bachat *** the results show,long-term rock excavations bring a prestressed thrust fault closer to the ultimate Coulomb strength,and stress variations at those depths may suffice to initiate a movement along the *** measuring seismic vibrations at different quarries and mines in Russia,the dynamic effect at the supposed depth of the source occurrence could be reliably *** is shown,the ultimate anticipated dynamic deformations are noticeably lower than corresponding values produced by seismic waves of distant earthquakes in the case when the effects of dynamic triggering were ***,the seismic effect of explosions cannot trigger a large earthquake with deep source *** in open-pit mines can only bring forward the moment of an earthquake at a potentially seismogenic *** the same time,the numerical calculations reveal that a branching network of underground tunnels located at several horizons can noticeably reduce the effective shear modulus of the host *** effect can even provoke a dynamic movement at a previously aseismic fault.

关键词： anthropogenic impact Coulomb stress variations fault induced seismicity mine seismicity open pits

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