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Evaluation of Alternative Techniques for Excavation Damage Characterization
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.ORCID-id: 0000-0003-1923-044X
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.ORCID-id: 0000-0002-5165-4229
Antal upphovsmän: 42016 (Engelska)Ingår i: ITA-AITES World Tunnel Congress 2016, WTC 2016 / [ed] Society for Mining, Metallurgy & Exploration (SME), United States of America, 2016, Vol. 2, s. 1168-1177Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

Numerous aspects of underground construction, from structural stability to construction costs, depended on the tunnel quality, including blast damage and the Excavation Damage Zone. Accurately quantifying the extent and severity of damaged rock is a problem. Recent technical developments in the field of Measurement While Drilling (MWD), including software for on-board logging and on-site analysis, have shown potential for rock-mass characterization. Ground Penetrating Radar (GPR) and P-wave velocity measurement have also improved and show similar potential. This paper explores the use of MWD, GPR and P-wave velocity measurements and uses them in techniques for excavation damage characterization and prediction. The paper is based on data collected from a small underground wastecollection site in central Stockholm, Sweden. The data is correlated against rock-mass characteristics and their responses are evaluated. Results indicate potential for excavation damage characterization for all tested techniques, which could minimize blasting damage and improve the over-all tunnel quality.

Ort, förlag, år, upplaga, sidor
United States of America, 2016. Vol. 2, s. 1168-1177
Nyckelord [en]
Excavation Damage Zone, Measurement While Drilling, EDZ, MWD, Drill & Blast, Tunnelling
Nationell ämneskategori
Annan samhällsbyggnadsteknik
Forskningsämne
Gruv- och Berganläggningsteknik
Identifikatorer
URN: urn:nbn:se:ltu:diva-60017OAI: oai:DiVA.org:ltu-60017DiVA, id: diva2:1040717
Konferens
ITA-AITES World Tunnel Congress 2016, San Francisco, 22-28 April 2016
Forskningsfinansiär
Stiftelsen Bergteknisk Forskning (BeFo)Tillgänglig från: 2016-10-28 Skapad: 2016-10-28 Senast uppdaterad: 2018-10-31Bibliografiskt granskad
Ingår i avhandling
1. Analysis of Excavation Damage, Rock Mass Characterisation and Rock Support Design using Drilling Monitoring
Öppna denna publikation i ny flik eller fönster >>Analysis of Excavation Damage, Rock Mass Characterisation and Rock Support Design using Drilling Monitoring
2018 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Prior to an underground excavation a site investigation is carried out. This includes reviewing and analysing existing data, field data collected through outcrop mapping, drill core logging and geophysical investigations. These data sources are combined and used to characterise, quantify and classify the rock mass for the tunnel design process and excavation method selection.

Despite the best approaches used in a site investigation, it cannot reveal the required level of detail. Such gaps in information might become significant during the actual construction stage. This can lead to; for example, over-break due to unfavourable geological conditions. Even more so, an underestimation of the rock mass properties can lead to unplanned stoppages and tunnel rehabilitation. On-the-other-hand, the excavation method itself, in this case, drill and blast, can also cause severe damage to the rock mass. This can result in over-break and reduction of the strength and quality of the remaining rock mass. Both of these attributes pose risks for the tunnel during excavation and after project delivery.

Blast damage encompasses over-break and the Excavation Damage Zone (EDZ). In the latter irreversible changes occur within the remaining rock mass inside this zone, which are physically manifested as blast fractures. In this thesis, a number of methods to determine blast damage have been investigated in two ramp tunnels of the Stockholm bypass. Herein, a comparison between the most common methods for blast damage investigation employed nowadays is performed. This comparison can be used to select the most suitable methods for blast damage investigation in tunnelling, based on the environment and the available resources. In this thesis Ground Penetrating Radar, core logging (for fractures) and P-wave velocity measurements were applied to determine the extent of the blast damage.

Furthermore, the study of the two tunnels in the Stockholm bypass shows a significant overestimation of the actual rock mass quality during the site investigation. In order to gain a more accurate picture of the rock mass quality, Measurement While Drilling (MWD) technology was applied. The technology was investigated for rock mass quality prediction, quantifying the extent of blast damage, as well as to investigate the potential to forecast the required rock support. MWD data was collected from both grout and blast holes. These data sets were used to determine rock quality indices e.g. Fracture Indication and Hardness Indicator calculated by the MWD parameters. The Fracture Index was then compared with the installed rock support at the measurement location.

Lastly, the extent of the damage is investigated by evaluating if the MWD parameters could forecast the extent of the EDZ. The study clearly shows the capability of MWD data to predict the rock mass characteristics, e.g. fractures and other zones of weakness. This study demonstrated that there is a correlation between the Fracture Index (MWD) and the Q-value, a parameter widely used to determine the required rock support. The study also shows a correlation between the extent of the blast damage zone, MWD data, design and excavation parameters (for example tunnel cross section and charge concentration).

Ort, förlag, år, upplaga, sidor
Luleå: Luleå tekniska universitet, 2018
Serie
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
Nyckelord
Blast damage, Excavation Damage Zone, EDZ, Measurement While Drilling, MWD, Rock support, Rock mass characterisation, Tunnelling
Nationell ämneskategori
Geoteknik Annan samhällsbyggnadsteknik
Forskningsämne
Gruv- och berganläggningsteknik
Identifikatorer
urn:nbn:se:ltu:diva-71402 (URN)978-91-7790-252-2 (ISBN)978-91-7790-253-9 (ISBN)
Presentation
2019-01-15, F1031, F-huset, Luleå, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2018-11-01 Skapad: 2018-10-31 Senast uppdaterad: 2019-01-07Bibliografiskt granskad

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van Eldert, JeroenIttner, HenrikSchunnesson, HåkanJohansson, Daniel

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