Titlebook: Rock Rheology; N. Cristescu Book 1989 Kluwer Academic Publishers 1989 Fundament.elasticity.formation.plasticity.rheology

occurrence

Book 1989 the result of a great number of questions posed either by mining engineers or by the author himself, and of the corresponding answers (unfor- tunately often only partial answers). This dialogue must certainly be continued in order to improve the models and to formulate models for other kinds of roc

COLIC

脆弱吧

Creep of rocks,afety, to increase the amount of extracted ore, etc. The simplest creep tests are the unconfined ones, when the lateral surface of the rock specimen is stress-free. Confined creep tests performed in a ‘triaxial’ apparatus where the lateral surface of the specimen is subjected to a constant pressure

flaunt

Volume deformation,f the volume deformation. Before discussing the formulation of a constitutive equation for a rock or a rock-like material, let us first discuss the characteristics of the volume deformation when a certain load is applied. Since the rock possesses voids, microcracks, etc., non-linear volume deformati

盡管

Bronchial-Tubes

,Rock ‘elasticity’ at high pressures,well as other properties, the rock also exhibits elastic properties. It has been mentioned in previous chapters that various authors have suggested that the elastic moduli have to be determined from the initial slopes of the stress—strain diagrams, assuming, by analogy with the behaviour of metals,

苦澀

Rock plasticity,inspired by the classical ones. We recall that according to the constitutive equations of classical plasticity no irreversible change of the volume of the material is possible. In what follows we present a short history of the development of the mathematical models so far formulated.

胎兒

不透氣

Damage and failure of rocks,have been proposed, starting from experimental evidence. Generally, these criteria depend on the stress-state alone, though it is well known that other factors such as time, humidity, loading history, temperature, etc., may well influence the damage and failure of rocks. Different variants of the ‘c

彎腰