The use of exploration techniques in the design of mine entries
It is common to predict the likely behaviour of mine entries under stress using mathematical models based on laboratory-derived rock properties. For a variety of reasons, samples may be unobtainable from strata of interest or their collection may introduce sampling bias. This report describes a programme of research into the feasibility of using geophysical measurements to synthesise mechanical rock properties. A suite of geophysical logs and 151 core samples were obtained from a surface borehole at a colliery. Statistical correlations were performed between the mechanical properties of the samples and the geophysical responses at the sampling depths. The regression equations were used to estimate mechanical rock properties at specified positions in an inclined tunnel at the mine. A multi-layered finite element model was used to estimate the extent of zones of overstressing due to excavation. An equivalent analysis was performed using laboratory data for samples obtained at the same positions in the tunnel. It was concluded that the synthesised data, whilst moderating the more extreme values, produced very similar stress profiles and failure envelopes to the laboratory data.
Bibliographic Reference: EUR 14771 EN (1993) 277 pp., MF, ECU 12
Record Number: 199311095 / Last updated on: 1994-11-29
Original language: en
Available languages: en