Showing papers in "International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts in 1987"

TL;DR: In this article, a closed form solution for the wall displacements and the ground pressure acting on the lining is given for the case of a circular tunnel driven in an homogeneous and isotropic medium with time-dependent behaviour.

TL;DR: In this paper, a convergence law for tunnel closure is proposed based on the divergence of the face advance effect and the time-dependent behavior of the rock mass, and a method for predicting the closure of tunnel is proposed.

TL;DR: In this paper, the effect of water on the deformation, fracture and strength of Lac du Bonnet granite has been investigated through a variety of experimental techniques: standard short-term tests for compressive strength and fracture toughness, and longer-term, time dependent experiments that measure creep, static fatigue and slow crack velocity.

TL;DR: In this article, a closed-form solution for the stress field induced by gravity in anisotropic rock masses is presented, which is constrained by the thermodynamic requirement that strain energy be positive definite, giving the following important result: inclusion of anisotropy broadens the range of permissible values of gravity induced horizontal stresses.

TL;DR: In this article, a two-dimensional elastoplastic model of a long cylindrical cavity in an infinite rock mass subject to non-hydrostatic far-field stress loading is presented.

TL;DR: In this paper, the static and dynamic moduli of a range of rock materials (sandstones, quartzites, norite and magnetite) for stress levels up to 40 mpa using a reliable method to measure compressional and shear wave velocities.

TL;DR: In this article, a new approach to the problem of defining geometrically polyhedral rock blocks created by the intersection of planar discontinuous in a rock mass is described, which, when implemented computationally, results in a procedure for the systematic identification of the spatial arrangement of rock blocks.

TL;DR: In this article, a general yet simplified constitutive model is proposed to characterize stress-deformation behavior of rocks based on the theory of elasto-plasticity and allows for factors such as hardening, volume changes, stress paths, cohesive and tensile strengths and variation of yield behaviour with mean pressure.

TL;DR: In this paper, a new pillar strength equation is proposed for all practical values of width-height ratio based on 23 unstable and 20 stable pillar cases and the safety factor is accordingly recommended for stowed and unstowed pillar arrays and chain pillars.

TL;DR: In this paper, a discrete fracture simulation approach is presented that incorporates the statistics of the fracture system geometry in the hydrogeological analysis of a fractured rock mass, and the fracture generation program is based on the Monte Carlo method and uses the statistic of field data of fracture geometry, i.e. fracture orientation, trace length, aperture and density.

TL;DR: In this paper, a series of three-dimensional stress analyses of a rectangular roadway was conducted using the boundary integral equation method (BIEM) to determine the stress distributions in the vicinity of a mine face when the roadway intersects the in situ stress field at different angles.

TL;DR: In this article, a mesurer 8 ordres de grandeur de permeabilite sous pression elevee de confinement was presented, concussed a partir de 1981.

TL;DR: In this paper, a general constitutive equation for rocks is proposed, which can describe their elastic and viscoplastic properties for any triaxial compressive stress state and the peculiarities of the creep phenomenon as described by the model are discussed.

TL;DR: In this article, the authors reported that pre-existing or natural microcavities in sandstones and crystalline rocks each have a significant and different effect on drilling rates and strength properties in their respective rock types.

TL;DR: In this article, the authors used interference fringes of Na-D light to measure the time-dependent deflection of the test-pieces to an accuracy of one-tenth of a wavelength and found that the deflection continued to decrease for about 650 days with the amount of decrease exceeding 10% of the entire deflection.

TL;DR: In this paper, the authors developed a hydraulic fracturing system for three dimensional stress determination, which incorporated fluid pressure at steady flow in a longitudinal fracture artificially produced around the borehole and the shut-in pressure in a transverse fracture which is apt to develop along a natural joint.

TL;DR: In this paper, l'effet des zones aveugles sur l'identification des joints and des failles, en calculant la largeur des zones AVEUGLES en fonction des procedures d'investigation mises en œuvre (sondages, decouvrements de surfaces rocheuses)

TL;DR: In this paper, a rock-support analysis is conducted assuming that the rock behaves linear viscoelastically while for the support it is non-linear, and it is shown which is the stress evolution in the lining due to the pressure exerted by the rock.

TL;DR: In this paper, a new model for rock bolt support of a single block is introduced, which includes approximations to the geometric as well as the force constraints imposed by the bolt, and an associated procedure enables either the tension in the bolt or the factor of safety to be determined if the other has been specified.

TL;DR: In this paper, the authors etudie le developpement de microfissure dans des materiaux susceptibles d'etre utilises for fabrication de conteneurs.

TL;DR: In this article, les essais sont realises for determiner la resistance a lusure par abrasion de la roche for les projets de protection cotiere aux Pays-Bas.

TL;DR: In this article, the number of joints, the joint-to-hammer length ratio and the bit/rock interaction were determined as functions of six dimensionless parameters which represent the number and impedance of the joints.