Contacts at the Coulomb threshold are unstable to tangential perturbations and thus contribute to failure at the microscopic level. How is such a local property related to global failure, beyond the effective picture given by a Mohr–Coulomb type failure criterion? Here, we use a simulated bed of frictional disks slowly tilted under the action of gravity to investigate the link between the avala...

Conjugate, or bimodal, fault patterns dominate the geological literature on shear failure. Based on Anderson's (1905) application of the Mohr-Coulomb failure criterion, these patterns have been interpreted from all tectonic regimes, including normal, strike-slip and thrust (reverse) faulting. However, a fundamental limitation of the Mohr-Coulomb failure criterion e and others that assume faults...

This paper discusses Coulomb failure criteria for brittle deformation of intact rock and fault gouge. Data are presented from laboratory experiments designed to identify the critical gouge layer thickness required to effect a transition from the standard Coulomb criterion to a modified failure law (referred to as Coulomb plasticity) appropriate for simple shear of a gouge layer. Experiments wer...

Sand production is a universally encountered issue during the exploration of unconsolidated sandstone reservoirs particularly during production. The production of sand particles with the reservoir fluids depends on the stress around a wellbore and the properties of the reservoir rocks and fluids. Therefore, it is crucial to predict under what production conditions sanding will occur and when sa...

This paper includes the most important findings of a series of linear analyses focusing on the development of failure that is identified through different failure criteria. The historic monument which was selected for this investigation is the church of Agia Triada, in the District of Karditsa, Greece. The numerical simulation for the church of Agia Triada includes all parts of the super-struct...

Deep and even ultra-deep petroleum resources play a gradually increasing important role with the worldwide continuous advancement of oil gas exploration development. In China, deep carbonate reservoirs in Tarim Basin are regarded as key development areas due to their huge reserves. However, unreasonable design production pressure differential, some wells suffered from severe borehole collapse t...