Abstract
ABSTRACT Stress measurement is the key step in mine design. It plays an important role when seismicity and rockbursting are expected to be major risks during project construction or mine operation. Mini-frac testing is commonly conducted for in situ stress measurement in the early stages of mine design studies before excavations are available. This paper presents the results of a series of mini-frac tests conducted at 350–750 m depth in a vertical borehole at the KGHM International Victoria Project in Sudbury, Ontario, Canada. Stress correlations were obtained using mini-frac test data and borehole breakout studies. The minimum stress orientation is vertical and gravity induced. The intermediate principal stress is horizontal with a k h (ratio of intermediate to vertical stress) equal to 1.41. For the maximum principal stress, two k H (ratio of maximum to vertical stress) values of 2.08 and 2.42 were found, based on two possible pore pressure scenarios. The estimated magnitudes of the principal stresses were also extended to depth based on borehole breakout analysis. The mini-frac test results and borehole breakout analysis achieved reasonable agreement. The borehole breakout images indicate that the maximum principal stress trend is N80E.
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