Abstract Understanding size effects is important to rigorously analyse the behaviour of rocks and rock masses at different scales for applications. A number empirical numerical studies have included on uniaxial compressive strength rocks, but only few focussed triaxial strength. In this study, several tests were conducted granite samples confinements (from 0.2 15 MPa) sizes 30 84 mm in diameter...

This paper aims to propose new stability equations for the design of shallow, unlined horseshoe tunnels in rock masses. The computational framework upper- and lower-bound finite-element limit analysis is used numerically derive solutions this problems using Hoek–Brown failure criterion. Five dimensionless parameters including width ratio cover-depth tunnels, as well normalized uniaxial compress...

An analytical approach for the estimating of critical seismic acceleration rock slopes was proposed in this study. Based on 3D horn failure model, coefficient conducted with modified Hoek–Brown (MHB) criterion framework upper-bound theory first time. The nonlinear is incorporated into three-dimensional rotational mechanism, and a generalized tangent technique introduced employed to convert line...

This paper presents the results of a numerical analysis impact rock mass geomechanical parameters on stability preparatory headings located within Legnica-Glogow Copper District. The shows calculations prepared for driven in two types with different strength and deformation parameters, which allow illustrating their influence safety mining performed underground copper ore mines. Numerical model...