Abstract
Within the Abitibi mining district ground stresses are of major concern because of potential ground failures and rockbursts. To identify the regional characteristics of the in situ stress domain within this important mining district, data obtained from stress determinations at 19 minesites are analyzed. The results show that the maximum and intermediate principal compressive stresses are horizontal to sub-horizontal, indicating no distinctive prevailing trends. The magnitudes of horizontal stresses exceed the vertical stress component and the measured vertical stresses approach the static overburden load. The ratios of the maximum/minimum horizontal stresses range from 1 to 3, indicating a decreasing trend toward depth. The relationship between stress ratios and the configuration of mine openings suggests that most mining excavations are subjected to high stress conditions. The stress data represented in this paper provide essential inputs in identifying initial design variables for numerical modelling applications in stability analysis of underground structures. The established stress gradients and stress ratios are considered as reference data to assess and verify future stress determination results in this region.
Published Version
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