A controlled in situ investigation of the relationship between stress, velocity and induced seismicity

Details A controlled in situ investigation of the relationship between stress, velocity and induced seismicity A controlled in situ investigation of the relationship between stress, velocity and induced seismicity

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22.1049m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 9, p. 1049-1052

Physics

4

Granite, P Waves, Seismic Energy, Tensile Stress, Tunneling (Excavation), Velocity Distribution, Deformation, Fracturing, Mines (Excavations), Spatial Distribution, Underground Storage, Wave Propagation

Scientific paper

A p-wave velocity survey was performed after the excavation of a cylindrical, horizontal tunnel through homogenous, visibly unfractured granite. An image of the velocity structure around the tunnel indicates a distinct zone of high velocity corresponding to a zone of increased elastic stresses, where a break-out notch formed. Perpendicular to this zone, a region of decreased velocity was found associated with a region of tensile elastic stress. The stress changes are believed to have preferentially opened and closed pre-existing micro-fractures in the rock, thereby decreasing and increasing the p-wave velocity. Additional velocity decreases are also attributed to creation of new fractures. The excavation-induced microseismicity is found to be generally associated with the high-velocity region adjacent to the notch, and apppears to be located along the boundary between the fractured, low-velocity and high-velocity regions.

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