Journal ArticleDOI
Deformation and fracturing behaviour of discontinuous rock mass and damage mechanics theory
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In this article, a damage tensor is proposed to deal with some sets of discontinuities distributed in a rock mass, for example, joint systems, which are characterized by a second-order symmetric tensor.Abstract:
The mechanical behaviour of a rock mass is strongly affected by discontinuities such as faults and joints. In this paper, a damage mechanics theory is proposed which deals with some sets of discontinuities distributed in a rock mass, for example, joint systems. In this theory, the distributed discontinuities are characterized by a second-order symmetric tensor, called the damage tensor. By introducing the damage concept, the deformation and fracturing behaviour of the rock mass can be reated in a framework of continuum mechanics. A numerical procedure is developed in order to implement the damage mechanics model by using the finite element method. The theory and numerical analysis are applied to several laboratory tests and a practical underground opening problem. Numerical results are compared with measured data.read more
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A review of techniques, advances and outstanding issues in numerical modelling for rock mechanics and rock engineering
TL;DR: In this paper, the authors present the techniques, advances, problems and likely future developments in numerical modelling for rock mechanics and discuss the value that is obtained from the modelling, especially the enhanced understanding of those mechanisms initiated by engineering perturbations.
Journal ArticleDOI
Energy Dissipation and Release During Coal Failure Under Conventional Triaxial Compression
TL;DR: In this paper, the authors investigated the relationship between energy transformation and coal failure by conventional triaxial compression tests using five different confining pressures and found that the peak strength increased with increasing confining pressure, but the critical damage variable was almost invariant.
Journal ArticleDOI
A statistical damage constitutive model for softening behavior of rocks
Xiang Li,Wen-Gui Cao,Yong-Hua Su +2 more
TL;DR: In this article, a basic theory of damage mechanics was introduced to deal with the deformation of strain softening for rocks, and the effect of the damage threshold on the evolution of rock damage was analyzed based on this damage model.
Journal ArticleDOI
Estimating the intensity of rock discontinuities
TL;DR: In this article, the size distribution and the number of discontinuities are estimated from the trace data sampled in circular windows by using a general stereological relationship between the true trace length distributions and the discontinuity diameter distribution.
Journal ArticleDOI
Practical equivalent continuum characterization of jointed rock masses
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.
References
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Journal ArticleDOI
A continuous damage mechanics model for ductile fracture
TL;DR: In this paper, a model of isotropic ductile plastic damage based on a continuum damage variable, on the effective stress concept and on thermodynamics is derived, showing a large influence of triaxiality by means of a damage equivalent stress.
Journal ArticleDOI
A Model for the Mechanics of Jointed Rock
TL;DR: In this article, a linkage type element is developed for adding rock joint stiffness to the structural stiffness matrix describing the behavior of a system of rock blocks and joints and a new classification of joints is introduced, based on the application of the joint element to finite element analysis of structures in jointed rock.
Journal ArticleDOI
Mechanism of brittle fracture of rock: Part I—theory of the fracture process
TL;DR: In this article, the authors presented results of investigations aimed at establishing a mechanism of brittle fracture of rock in compression and tension, and provided experimental verification of the postulated mechanism of rock fracture.
Journal ArticleDOI
Creep rupture under multi-axial states of stress
TL;DR: In this paper, metallographic analyses of specimens which have been creep tested at high temperatures and under different conditions of steady applied stress are presented, and the interaction between the growth of micro-fissures or voids and the mode of final rupture is discussed.