岩石の破壊および降伏条件 : 新方式の三軸試験法による研究

概要

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A new triaxial compression technique has made it possible to make studies on laws of fracture and yielding of rocks under general triaxial stress states, in which all the three principal stresses are different. By this new method, the effects of the stress states to fracture and yielding of rocks were experimentally studied. Fracture and flow properties of rocks are markedly affected not only by the least compression σ_3, but also by the intermediate compression σ_2. The stress states, which produce fracture and yielding, are determined by the following formulas : τ_oct= f_1(σ_1+σ_3) for fracture, τ_oct= f_2(σ_1+σ_2+σ_3) for yielding, where f_1 and f_2 are functions of monotonic increase. The failure criteria, corresponding to von Mises' criteria generalized, are physically interpreted as follows : fracture or yielding will occur when the distorsional strain energy reaches a critical value which increases monotonically with the effective mean pressure : (σ_1+σ_3)/2 for fracture and (σ_1+σ_2+σ_3)/3 for yielding.
1971-02-15