The effect of hydrothermal alteration on the mechanical behaviour of rockmass

Burdett, M 2016, The effect of hydrothermal alteration on the mechanical behaviour of rockmass, Masters by Research, Civil, Environmental and Chemical Engineering, RMIT University.


Document type: Thesis
Collection: Theses

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Title The effect of hydrothermal alteration on the mechanical behaviour of rockmass
Author(s) Burdett, M
Year 2016
Abstract The Xantho case study aims to quantify the influence that hydrothermal alteration type and intensity has on the mechanical behaviour of the Xantho rockmass at the Gossan Hill volcanogenic massive sulfide (VMS) Zn-Cu-Pb underground mine. Classifying fracture frequency domains in drill core by the type and intensity of the secondary hydrothermal alteration assemblage, the Xantho case study displays a quantifiable distinction between the mechanical behaviour of the chlorite altered and silica altered intact rocks and rockmass. Supplementary classification of altered fracture domains by lithology and geological setting show how the different material properties and gross textural character of the stratified volcanoclastic sediments and massive igneous intrusions influence the development of fractures in a predictable manner.

Characterisation and quantification of the rockmass using the geological strength index provides three significant rockmass quality populations that highlight the importance of alteration type on the condition of the discontinuity and draws a distinction between volcanoclastic sediments and igneous intrusions. Numerical modelling of the chlorite and silica rockmass using the Hoek-Brown failure criterion displays marked behaviour near an underground excavation and coupled with the location of strong core disking, illustrate the role that hydrothermal alteration may have in distributing far-field stress.
Degree Masters by Research
Institution RMIT University
School, Department or Centre Civil, Environmental and Chemical Engineering
Subjects Civil Geotechnical Engineering
Keyword(s) Hydrothermal alteration
Mining
Rockmass
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Created: Thu, 02 Mar 2017, 13:30:42 EST by Denise Paciocco
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