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Interpretation of the development of induced cracks within a pre-cracked rock microstructure and the similarities with the geometry of larger-scale geological fractures
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Engineering Geology and Geophysics.
Department of Earth Science and Engineering, Imperial College, London.
Department of Earth Science and Engineering, Imperial College, London.
(English)In: Journal of Structural Geology, ISSN 0191-8141, E-ISSN 1873-1201Article in journal (Other academic) Submitted
Keyword [en]
Fracture interactions; brittle failure; pre-existing fractures; Mode I fracturing; Class II behaviour; Uniaxial compressive test
National Category
Geophysical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-8737OAI: oai:DiVA.org:kth-8737DiVA: diva2:14142
Note
QC 20100709Available from: 2008-06-12 Created: 2008-06-12 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Rock damage caused by underground excavation and meteorite impacts
Open this publication in new window or tab >>Rock damage caused by underground excavation and meteorite impacts
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The intent of this thesis is to contribute to the understanding of the origin of fractures in rock. The man-made fracturing from engineering activities in crystalline rock as well as the fracturing induced by the natural process of meteorite impacts is studied by means of various characterization methods. In contrast to engineering induced rock fracturing, where the goal usually is to minimize rock damage, meteorite impacts cause abundant fracturing in the surrounding bedrock. In a rock mass the interactions of fractures on the microscopic scale (mm-cm scale) influence fractures on the mesoscopic scale (dm-m scale) as well as the interaction of the mesocopic fractures influencing fractures on the macroscopic scale (m-km scale). Thus, among several methods used on different scales, two characterization tools have been developed further. This investigation ranges from the investigation of micro-fracturing in ultra-brittle rock on laboratory scale to the remote sensing of fractures in large scale structures, such as meteorite impacts. On the microscopic scale, the role of fractures pre-existing to the laboratory testing is observed to affect the development of new fractures. On the mesoscopic scale, the evaluation of the geometric information from 3D-laser scanning has been further developed for the characterisation of fractures from tunnelling and to evaluate the efficiency of the tunnel blasting technique in crystalline rock. By combining information on: i) the overbreak and underbreak; ii) the orientation and visibility of blasting drillholes and; iii) the natural and blasting fractures in three dimensions; a analysis of the rock mass can be made. This analysis of the rock mass is much deeper than usually obtained in rock engineering for site characterization in relation to the blasting technique can be obtained based on the new data acquisition. Finally, the estimation of fracturing in and around two meteorite impact structures has been used to reach a deeper understanding of the relation between fracture, their water content and the electric properties of the rock mass. A correlation between electric resistivity and fracture frequency in highly fractured crystalline rock has been developed and applied to potential impact crater structures. The results presented in this thesis enables more accurate modelling of rock fractures, both supporting rock engineering design and interpretation of meteorite impact phenomena.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. xii, 57 p.
Series
Trita-LWR. PHD, ISSN 1650-8602 ; 1044
Keyword
Excavation Damage Zone (EDZ), Fracture analysis, Pre-existing fractures, Class II behaviour, 3D laser scanning, Impact fracturing
National Category
Geophysical Engineering
Identifiers
urn:nbn:se:kth:diva-4824 (URN)978-91-7415-035-3 (ISBN)
Public defence
2008-09-03, F3, Lindstedtsvägen 26, 100 44, Stockholm, 14:00
Opponent
Supervisors
Note
QC 20100709Available from: 2008-06-12 Created: 2008-06-12 Last updated: 2010-07-09Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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