The effect of confining pressure on stress-drop in compressive rock fracture

Constraining the size of the South Pole-Aitken basin impact

“…yield strength, melt temperature) for the crust material were calculated from fits to experimental gabbro rock strength data (Azmon, 1967;Stesky et al, 1974;Shimada et al, 1983). For the impactor and mantle material, model parameters were derived from fits to both dunite (Shimada et al, 1983;Ismail and Murrell, 1990) and peridotite data (Stesky et al, 1974;McKenzie and Bickle, 1988). See Table 1 for calculated crustal and mantle parameters.…”

Investigating the onset of multi-ring impact basin formation

“…As a suitable proxy for asteroidal material (Pierazzo et al, 1997), the dunite ANEOS was also used to represent the impactor. The strength and thermal properties of these materials were taken from gabbro (Azmon, 1967;Stesky et al, 1974;Shimada et al, 1983) and dunite (Shimada et al, 1983;Ismail and Murrell, 1990) laboratory experiment data; curves for mantle melt temperature as a function of pressure for dunite were taken from Davison et al (2010). The strength and damage models used here are described in Collins et al (2004) and Ivanov et al (2010), respectively.…”

Stress Drop as a Result of Splitting, Brittle and Transitional Faulting of Rock Samples in Uniaxial and Triaxial Compression Tests

“…The pressure at with the stress drop goes to zero marks the transition from brittle to ductile state. There can be seen qualitatively similar behavior for very different rock types with very different strengths (Ismail and Murrel [10]). …”

“…In the works presented by Ismail and Murrel [10] for conventional triaxial compression tests the stress drop value is clearly pressure sensitive and it is dependent on test confining pressure. In the case of true triaxial compression (Mogi [16], Kwaśniewski [13]) stress drop is a function of σ 2 and σ 3 respectively.…”

“…Stress drop phenomenon as an effect of rock strength loss is directly related to energy dissipated due to failure. It can be analyzed by laboratory investigation on intact rock samples in conventional and true triaxial compression tests (Ismail and Murrell [10], Mogi [16], Kwaśniew-ski [13]), on saw cut samples in conventional triaxial tests and biaxial tests, double shear tests and conventional shear tests (Mogi [16]). The experiments conducted on rock samples with a cut plane in biaxial tests and double shear tests usually are performed for rock friction, sliding and frictional stability analysis (Jaeger and Cook [11], Paterson [18], Byerlee [3]).…”