Chinese journal of rock mechanics and engineering · 2013 · 22 citations · 0 references
EngineeringEarth SciencesGeological EngineeringEngineering GeologyGeotechnical EngineeringRock MechanicsRock DeformationRock Mass ClassificationRock PropertiesRock StrengthShear Strength Of RocksStrain In RocksRock Mass StrengthRockburstRockburst PredictionShear StressStrength CriterionStress-strain RelationshipsTensile StrengthTensile Strength Estimation
On the basis of the 5-factors comprehensive method for rockburst classification,the authors put forward an empirical criterion for expressing rockburst potential and intensity.The field investigation and statistic analyses are carried out with help of interaction matrix approach.The proposed criterion is called rockburst potential rb t v P(θ/ R)K = σ,where σ θis maximum value of shear stress in sides walls;Rt is tensile strength;K vis the intactness index of rock mass.Corresponding to the 4 grades as intense,moderate,weak and no rockburst,the 3 boundary values are presented as 1.7,3.3 and 9.7.General calculation for depths of H = 1 000 and 2 000 m(lateral coefficient λ = 1.0),the Pr bvalues are 3.3 and 6.5,corresponding to upper limit of weak rockburst,and median of moderate rockburst,respectively.Case studies for application show the feasibility and reliability of the index Pr b.