Investigating the shear failure caused by concentration of compressive stress around noncircular boreholes is important both in field and laboratory. This article deals with numerical analysis elliptical under a nonisotropic situ using Mogi–Coulomb nonlinear criterion. The purpose presented model to simulate progressive (breakout) borehole investigate impact eccentricity on stability depth widt...

To clarify the factors affecting stability of deep-buried hydraulic tunnels containing pore water, elastoplastic theory and Mogi-Coulomb strength criterion were used to derive analytical solutions stress on surrounding rock-lining structure, tunnel wall displacement, plastic zone radius in rock under different operating conditions. During this process, seepage effect interaction considered. The...

In order to strengthen disaster prevention control under deep resource development and space utilization, it is necessary construct a damage intrinsic model complex stress states predict the mechanical behavior of deep-rock mass cyclic loading. An indoor uniaxial loading test on sandstone was carried out in this paper. By analyzing properties energy transformation failure process, assumed that ...

A rock failure criterion is very important for prediction of the ultimate strength in rock mechanics and geotechnics; it is determined for rock mechanics studies in mining, civil, and oil wellborn drilling operations. Also shales are among the most difficult to treat formations. Therefore, in this research work, using the artificial neural network (ANN), a model was built to predict the ultimat...

With the construction of supertall buildings such as high earth dams, linear envelope Mohr-Coulomb (M-C) failure criterion fitted to lower confined pressure would significantly underestimate loading capacity foundations, causing a huge increase in amount earthwork. Given that M-C has dominated stability analysis geotechnical structures, it is proposed this study remain invariant form but cohesi...

Determination of the borehole and fracture initiation positions is the main aim of a borehole stability analysis. A wellbore trajectory optimization with the help of the mud pressure may be unreasonable since the mud pressure can only reflect the degree of difficulty for the initial damage to occur at the wellbore rather than the extent of the wellbore damage. In this work, we investigate...

Abstract Extension fractures are typical for the deformation under low or no confining pressure. They can be explained by a phenomenological extension strain failure criterion. In past, simple empirical criterion fracture initiation in brittle rock has been developed. this article, it is shown that makes unrealistic strength predictions biaxial compression and tension. To overcome major limitat...

A new method for implicit integration of the Mohr-Coulomb non-smooth multisurface plasticity models is presented, and Koiter’s requirements are incorporated exactly within proposed algorithm. Algorithmic numerical complexities identified introduced by nonsmooth intersections surfaces; then, a projection contraction algorithm applied to solve classical Kuhn–Tucker complementary equations which p...