Showing papers in "International Journal of Rock Mechanics and Mining Sciences in 2001"

TL;DR: In this paper, the Schmidt hammer and sound velocity tests exhibit significant non-linear correlations with the compressive strength of rock and the results indicated that the least variability is shown in the impact strength test, while the variability of test results for other test methods is within acceptable limits for most engineering purposes.

TL;DR: In this paper, the authors investigated the crack coalescence and peak strength of rock-like materials containing three parallel frictional flaws and found that the failure mechanism strongly depends on the cracks coalescence pattern between pre-existing flaws.

TL;DR: In this paper, an improved version of the original model suggested by Barton (Office of Nuclear Waste Isolation, Columbus, Ohio, ONWI-308, 1982, p. 96pp) for the hydromechanical coupling of rock joints is presented.

TL;DR: In this paper, a cyclic shear testing system was established to investigate the mechanical behavior of rough rock joints under cyclic loading conditions, such as high peak shear strength and non-linear dilation in the first loading cycle, different frictional resistance for the reversed shear loading direction, and anisotropic shear behavior and its dependence on the normal stress level.

TL;DR: In this paper, the experimental study of rock strength revealed a remarkable mechanical variation in closely related rocks through a quantitative analysis of microstructures and the typical grain size was found to be the main microstructural factor controlling strength variation in groups of rocks which are closely related mineralogically.

TL;DR: In this paper, a neural network was used to predict uniaxial compressive strength, tensile strength and axial point load strength simultaneously from the mineral composition and textural properties.

TL;DR: In this paper, the general governing equations for coupled thermohydromechanical (THM) processes in saturated and unsaturated geologic formations are presented and four finite element codes for modeling of such system are reviewed.

TL;DR: In this paper, both in situ measurements of permeability and numerical modelling of changes in permeability induced by micro-crack growth are discussed, and it is shown that a depth of 50-70 cm is a good estimation of the extent of excavation disturbed zone in the tunnel.

TL;DR: In this article, a method of characterizing rock mass damage near excavations based on microseismic event monitoring is developed and a damage-driven numerical model is presented that takes the micro seismic data as input to determine the damage state described by fracture density, based on the discovery that a realistic crack size corresponding to a seismic event can be established by applying a tensile cracking model instead of the traditional shear model, commonly used in earthquake analysis.

TL;DR: In this paper, a new failure criterion for transversely isotropic rocks is presented, which is based on two distinct failure modes; one is the sliding mode where the failure is caused by sliding along the discontinuity, and the other is controlled by the rock material and is not dependent on discontinuity.

TL;DR: In this article, the effect of scale on the surface roughness of rock joints was investigated using a 3-D laser scanner with high accuracy and resolution on a silicon rubber replica of a natural rock joint surface.

TL;DR: In this article, a detailed three-dimensional finite-element study was conducted to explore near-field stress paths during the progressive advancement of a tunnel face, and the authors demonstrated that as the tunnel face approaches and passes through a unit volume of rock, the spatial and temporal evolution of the 3D stress field encompasses a series of deviatoric stress increases and/or decreases as well as several rotations of the principal stress axes.

TL;DR: In this paper, the effect of joint geometry parameters on the uniaxial compressive strength of jointed blocks was investigated and the results of the experiments and numerical simulations were presented.

TL;DR: In this article, a numerical model for coupled hydro-mechanical processes in fractured hard rocks using the discontinuous deformation analysis (DDA) method was presented, where the emphasis was on the physical behavior of the coupled stress/deformation and fluid flow interaction in rock fractures.

TL;DR: In this paper, a three-dimensional (3D) slope stability analysis method based on its two-dimensional approaches proposed by Donald and Chen (Can. Geotech. 34 (1997) 853) is presented.

TL;DR: In this paper, the effect of joints in the rock mass is taken into account by a joint factor, which is incorporated in a non-linear FEM code to represent the equivalent continuum analysis.

TL;DR: In this paper, the dynamic fracture toughness of Fangshan gabbro and Fangshans marble subjected to high temperature was measured by means of the split Hopkinson pressure bar (SHPB) system.

TL;DR: In this article, the authors present a practical example illustrating the usefulness of stress change measurements in providing an accurate picture of the mining-induced stress changes and their value for numerical model calibration.

TL;DR: In this paper, the results of numerical modelling of failed and stable cases of pillars from Indian coal mines are reported and the complete procedure for modelling using FLAC3D in the strain-softening mode is given.

TL;DR: In this paper, a more realistic and responsive shear strength criterion, involving only two different strength parameters, that remain practically constant with the applied stress, is advocated to represent non-linear response that minimizes the drudgery by conducting a number of triaxial tests on the material.

TL;DR: C coupled thermo-hydro-mechanical (THM) issues relating to nuclear waste repository design and performance are reviewed and a predictive THM capability is required to support repository design because precedent practice information is insufficient.

TL;DR: In this article, the authors describe a technique for predicting the occurrence of strong rockbursts in mines using both the kinetic theory of solid strength and the "rigid inclusion" model.

TL;DR: In this article, four computer codes were applied for a prediction of coupled thermo-hydro-mechanical responses during an in situ heater experiment which simulates a nuclear waste deposition hole with a waste over-...

TL;DR: In this paper, the authors used the block punch strength index (BPI) to measure the uniaxial compressive strength (UCS) of a thin plate of rock and showed that BPI leads to insignificant errors when compared to those obtained from point load testing, particularly for laminated weak rocks.

TL;DR: In this article, a three-dimensional failure surface is generated by elliptical lines based on the slip surface in the neutral plane and extended in the z direction, and a method of optimisation is followed in order to find a set of these variables that offers the minimum factor of safety.

TL;DR: In this paper, a novel method for displacement back analysis is presented, based on error back-propagation neural network and genetic algorithm (GA), which replaces the time-consuming finite element method, thus enhancing the efficiency of the analysis.