Showing papers in "International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts in 1985"

TL;DR: In this paper, the results of many years of research on joint properties are synthesized in a coupled joint behaviour model, which simulates stress and size-dependent coupling of shear stress, diplacement, dilation and conductivity.

TL;DR: In this article, the authors describe l'appareil d'essais d'echantillons de roche and the methode de calcul de la resistance a la charge ponctuelle.

TL;DR: In this paper, the effect of changes in sample size on the normal stress-permeability properties of natural fractures was studied, and the results indicated that the smaller fracture surfaces may be characterized by a few high asperities unevenly distributed over the sample, while the larger fracture surfaces were typified by a greater number of more variable height as perities more evenly distributed over a sample.

TL;DR: In this paper, a simplified theoretical analysis and the experimentally proven assumption that tensile rather than shear failure is the dominant chip forming mechanism are derived for the prediction of disc cutter performance in bedded and schistose rocks.

TL;DR: In this article, an extensive fracture data base was collected from a granitic rock mass at Stripa, Sweden, which was used to provide a statistical characterization of fracture orientation, size, spacing and density.

TL;DR: In this paper, a method is presented which relates a parameter describing rock surface roughness (a gradient statistic) to the frictional strength of discontinuities (the friction angle) by using the average asperity gradient, which can be shown to be largely independent of the sampling interval.

TL;DR: In this paper, a servo-controlled direct shear testing machine was constructed to simulate these boundary conditions in the laboratory, and the results of the experiments indicate that shear force and normal displacement are both functions of normal force and shear displacement.

TL;DR: In this article, the Point Load Test (PLLT) has been used for compressive strength estimation, rock mass classification, estimation of triaxial behaviour and small scale physical model testing.

TL;DR: In this article, the authors assessed methods for revealing cracks in unstressed rock and cracks developed during uniaxial and triaxial compression up to failure, using three different rocks: microgranodiorite, dolerite and marble.

TL;DR: In this paper, the effect of topography on near-surface, gravity-induced stresses has been analyzed using an elastic solution similar to one originally given by Akhpatelov and co-workers.

TL;DR: In this article, a linear combination of stress and strain, (ϵ − σ/E′), is used as the feedback signal in a closed-loop, servo-controlled testing machine.

TL;DR: In this article, a computational model is used to predict the propagation of gas-driven fractures emanating from a pressurized borehole, taking into account the space-wise and time-wise variations in fracture opening displacements, as well as the seepage losses and heat losses into the walls.

TL;DR: In this article, the authors discuss the mechanics of a porous rock medium in which the capillaries are filled with a gaseous substance, and show that in a rarefaction shock wave the skeleton of the medium is destroyed and an outburst initiated.

TL;DR: In this article, an experimental investigation of comprehensive fracture toughness of syenite and basalt rocks by using a testing procedure which consists of threepoint bending, asymmetric three-point bending and four-point shear tests was conducted.

TL;DR: A series of compression and shear tests were conducted at large scale on joint surfaces in granite and slate specimens, with special equipment being used to isolate the deformations of the joints from those of the rock material as discussed by the authors.

TL;DR: The paper proposes the application of fuzzy set theory in assisting mining engineers in the geomechanics decision processes for which subjectivity plays an important role.

TL;DR: In this article, the authors describe the nature of rock-tool interaction during cutting indentation, and the importance of using case history studies to identify optimum tbm performance is discussed, and a preliminary investigation into the correlation between intact rock fracture properties and the performance of tbms involved in actual construction projects are given.

TL;DR: In this paper, a specific test on coal is used to discuss the behavior of openings in a jointed rock mass during the failure process, and it is concluded that existing design models do not satisfactorily simulate the transition from yielding to rupture and that both behaviour modes must be evaluated separately for proper tunnel design and selection of optimal construction techniques.

TL;DR: In this article, a new formulation of the direct boundary element method is presented for modelling structural discontinuities, such as geological joints and faults, in heterogeneous rock, where the rock surrounding a discotinuity is assumed to be linear elastic and, for the purpose of modelling, is divided into regions of homogeneous material, with adjacent regions separated by interfaces.

TL;DR: In this article, an approximate analysis of pyramidal indentation into a rock is presented in which the upper bound approach of limit analysis is utilized, and two kinematically admissible mechanisms of possible deformation processes, based upon the non-associated flow rule, are adopted for predictions of geometrical variations.

TL;DR: Churn drilling, down-the-hole drilling, hammer drilling, and related related drilling and breaking processes are simulated by means of a microcomputer as discussed by the authors, and the simulation programs are written in Apple Pascal.

TL;DR: In this paper, the porosity of sandstones is divided into intergranular (equidimensional, size comparable to grains), connective (tabular or tubular shaped), and micro (less than a few microns in size) porosity based on point counting SEM images.

TL;DR: The NX-borehole jack is a widely used tool for estimating the deformability of rock masses in situ as mentioned in this paper. But in practice, using the original theoretical formula, frequently has resulted in computing a material modulus which was demonstrably too low.

TL;DR: In this article, the authors measured the permanent and elastic strains in 19 dry sandstones as a function of hydrostatic stress to 200 MPa and used differential strain analysis (DSA) to measure the total strain in three orthogonal directions.