Table 8: Fields considered in the database.
Field Topics
Location of the test Location sample; depth (m); country; date.
Dimensions of sample Code, length; width; height (mm); volume (cm3)
Rock material Type of rock; RQD; UCS (MPa); Specific weight (g/cm3); E (GPa) Elastic modulus; ν – Poisson ratio.
Main minerals and cracks % clay; % feldspar; % calcite; % carbon; Existence of cracks
Stresses before loading (MPa) σv – vertical in situ stress; σh1 –horizontal in situ stress; σh2 – horizontal in situ stress in the face to be unloaded; I1 (first invariant of the stresses); I2 (second invariant of the stresses); I3 (third invariant of the stresses).
Stresses during tests (MPa) Rockburst maximum stress (σRB); maximum stress axis; loading rate in MPa/s; unloading rate for vertical stresses in MPa/s; unloading times.
Characteristics of rockburst test Type of burst position; duration of the test in minutes; time of burst delay (minutes); mainly shape of fragments.
Critical depth (m) Critical depth; rockburst risk index.