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A study of impact fracturing and electric resistivity related to the Lockne impact structure, Sweden
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Mark- och vattenteknik.
2005 (engelsk)Inngår i: Impact Tectonics / [ed] Koeberl C; Henkel H, 2005, s. 389-404Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

The fracture frequency and the electric resistivity of outcrops of crystalline basement rocks at the Lockne meteorite impact site have been studied in order to investigate the extent and radial changes of impact induced fracturing. By measuring the electric resistivity and the fracture frequency at the same outcrops, the effect of fracturing on the electric properties of the rock is estimated and correlated with the fracture frequency. A negative linear correlation between the Log of fracture frequency and the Log of electric resistivity was found.

It was also found that the fracture frequency decreases in a transition zone over a distance of about 1100 m across the southern margin of the impact structure. A similar set of measurements was made across the suggested northern limit of the structure, but no change was detected. This implies that the outer limit of the Tandsbyn Breccia is further to the north. The studied area is, therefore, not likely to be the. margin of the structure.

sted, utgiver, år, opplag, sider
2005. s. 389-404
Serie
IMPACT STUDIES
Emneord [en]
CRATER
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-8742DOI: 10.1007/3-540-27548-7_15ISI: 000229304500015ISBN: 3-540-24181-7 (tryckt)OAI: oai:DiVA.org:kth-8742DiVA, id: diva2:14147
Konferanse
8th International Meeting on Response of the Earth System to Impact Processes (IMPACT), Mora, SWEDEN, MAY 31-JUN 03, 2002, European Sci Fdn
Merknad
QC 20100709Tilgjengelig fra: 2008-06-12 Laget: 2008-06-12 Sist oppdatert: 2010-07-09bibliografisk kontrollert
Inngår i avhandling
1. Rock damage caused by underground excavation and meteorite impacts
Åpne denne publikasjonen i ny fane eller vindu >>Rock damage caused by underground excavation and meteorite impacts
2008 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Stockholm: KTH, 2008. s. xii, 57
Serie
Trita-LWR. PHD, ISSN 1650-8602 ; 1044
Emneord
Excavation Damage Zone (EDZ), Fracture analysis, Pre-existing fractures, Class II behaviour, 3D laser scanning, Impact fracturing
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-4824 (URN)978-91-7415-035-3 (ISBN)
Disputas
2008-09-03, F3, Lindstedtsvägen 26, 100 44, Stockholm, 14:00
Opponent
Veileder
Merknad
QC 20100709Tilgjengelig fra: 2008-06-12 Laget: 2008-06-12 Sist oppdatert: 2010-07-09bibliografisk kontrollert

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Totalt: 120 treff
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