Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Anelastic Strain Recovery and The Kaiser Effect Retention Span in the Carnmenellis Granite, U.K.
Summary Knowledge of in-situ stress in rock masses is essential for mining and civil engineering design and the Kaiser effect method of stress determination provides an economical alternative to currently applied investigation techniques. A practical problem associated with this method is the loss of the Kaiser effect over time during the process of anelastic strain recovery, but a direct relationship is observed between anelastic strain recovery and the number of acoustic emissions. The behaviour is modelled here using the Kelvin and Burger rheological models, for the stages of creep during uniaxial laboratory loading, anelastic strain recovery and the loss of the Kaiser effect, with constants being calculated and compared for samples loaded under geological and laboratory conditions. It is found that the loss of the KE at low stress levels compares directly with the process of anelastic strain recovery and fits the Burger model over the time scales of interest. A difference between primary and secondary (undercored samples) recovery is demonstrated with a slower recovery for primary relaxation and with samples taken from geological stress environments recovering more slowly than those loaded under laboratory conditions, for all stress levels tested.
Anelastic Strain Recovery and The Kaiser Effect Retention Span in the Carnmenellis Granite, U.K.
Summary Knowledge of in-situ stress in rock masses is essential for mining and civil engineering design and the Kaiser effect method of stress determination provides an economical alternative to currently applied investigation techniques. A practical problem associated with this method is the loss of the Kaiser effect over time during the process of anelastic strain recovery, but a direct relationship is observed between anelastic strain recovery and the number of acoustic emissions. The behaviour is modelled here using the Kelvin and Burger rheological models, for the stages of creep during uniaxial laboratory loading, anelastic strain recovery and the loss of the Kaiser effect, with constants being calculated and compared for samples loaded under geological and laboratory conditions. It is found that the loss of the KE at low stress levels compares directly with the process of anelastic strain recovery and fits the Burger model over the time scales of interest. A difference between primary and secondary (undercored samples) recovery is demonstrated with a slower recovery for primary relaxation and with samples taken from geological stress environments recovering more slowly than those loaded under laboratory conditions, for all stress levels tested.
Anelastic Strain Recovery and The Kaiser Effect Retention Span in the Carnmenellis Granite, U.K.
Barr, S. P. (Autor:in) / Hunt, D. P. (Autor:in)
Rock Mechanics and Rock Engineering ; 32 ; 169-193
01.07.1999
25 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Anelastic Strain Recovery and The Kaiser Effect Retention Span in the Carnmenellis Granite, U.K
| British Library Online Contents | 1999
Anelastic Strain Recovery and The Kaiser Effect Retention Span in the Carnmenellis Granite, U.K.
| Online Contents | 1999
Poroviscoelastic effects in anelastic strain recovery tests
| British Library Conference Proceedings | 1999
The poroviscoelastic solution for anelastic strain recovery
| British Library Conference Proceedings | 2000
Experimental Anelastic Strain Recovery Compliance of Three Typical Rocks
| Online Contents | 2013