The new Col di Tenda tunnel between Italy and France: Integrated geological investigations and geophysical prospections for preliminary studies on the Italian side

Cavinato, Gian Paolo; Luzio, Emiliano Di; Moscatelli, Massimiliano; Vallone, Roberto; Averardi, M.; Valente, Alessio; Papale, S.

doi:10.1016/j.enggeo.2006.09.001

Cited by 20 publications

(16 citation statements)

References 2 publications

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“…For example, Jurassic limestones and dolomites deposited in a Mesozoic marine basin in France were investigated by Gélis et al (2010), while Cavinato et al (2006) investigated Jurassic limestones and Triassic marls in the Italian Maritime Alps. However, IP variations in limestones have not been frequently investigated in previous research.…”

mentioning

confidence: 99%

Investigations of a Cretaceous limestone with spectral induced polarization and scanning electron microscopy

Johansson¹,

Sparrenbom

Fiandaca

et al. 2016

Geophys. J. Int.

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mentioning

confidence: 99%

Investigations of a Cretaceous limestone with spectral induced polarization and scanning electron microscopy

Johansson¹,

Sparrenbom

Fiandaca

et al. 2016

Geophys. J. Int.

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“…Before deciding on a certain method, knowledge about the expected contrasts in physical properties has to be obtained from e.g., previous measurements, geological maps and geological history. Evaluations of the different geophysical methods used in connection to construction of a number of tunnels (Dahlin et al, 1999;Rønning, 2003;Cavinato et al, 2006;Ganerød et al, 2006) showed that geoelectrical imaging gave good results. In addition it was a time and cost effective method compared to other geophysical methods.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore a thorough pre-investigation has to be carried out in order to establish the best geological model possible. Different geophysical methods have proven to be valuable tools in the early stages of the large scale preinvestigations (Dahlin et al, 1999;Rønning, 2003;Cavinato et al, 2006;Ganerød et al, 2006). An engineering geological prognosis is based on the pre-investigation report and the purpose is to form the base for design and estimation of e.g., reinforcements and grouting (Swindell and Rosengren, 2007).…”

Section: Introductionmentioning

confidence: 99%

Comparison of geoelectrical imaging and tunnel documentation at the Hallandsås Tunnel, Sweden

Danielsen

Dahlin

2009

Engineering Geology

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For construction in rock a thorough pre-investigation is important in order to avoid unforeseen conditions which may delay the work. It is crucial to remember the results from this investigation in the further work, and use the experience from the construction to update the geological prognosis and reduce the uncertainties. Different geophysical methods have proved valuable tools in such investigations. In this work the electrical imaging is evaluated with regards to the method's applicability. The evaluation is done qualitatively by comparing the electrical imaging with tunnel documentation from a tunnel in Southern Sweden. By evaluating the result continuously when making the tunnel a more detailed geological prognosis can be compiled and used in the continued work with the tunnel. The parameters used for the comparison are lithology, Q, RQD, weathering and water leakage. The result was that virtually every change in electrical resistivity image coincides with a change in rock conditions. The general trend was that high resistivity corresponded with good quality gneiss whereas low resistivity corresponds to poor quality rock e.g., high weathering, low RQD, low Q and/or several lithological contacts. The intermediate resistivity is often amphibolites or rock with water bearing fractures. The results were supported by in-situ resistivity measurements inside the tunnel and resistivity logging in a core drilling. Geoelectrical imaging proved to give valuable information for a detailed geological model, which could be compiled for a section where the tunnel had not yet been drilled as a help for planning of the continued tunnel work. As is the case other geophysical methods it is clear that for the interpretation of data a priori information about the geological setting is necessary.

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“…The geoelectrical imaging has with advantage been used in the pre-investigation at several tunnel projects (Cavinato et al 2006;Dahlin et al 1999;Ganerød et al 2006). To get the optimum benefit from the resistivity data certain knowledge of the geological setting is necessary.…”

Section: Introductionmentioning

confidence: 99%

Comparison between Geoelectrical Imaging and Tunnel Documentation

Danielsen

Dahlin

2007

Near Surface 2007 - 13th EAGE European Meeting of Environmental and Engineering Geophysics

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SUMMARYThe documentation from the use of a tunnel boring machine (TBM) is used for the evaluation of geoelctrical imaging. Rock type, RQD and weathering are visually compared with resistivity data extracted from different levels in the inversion result. The three types of resistivity, i.e. high, low and intermediate resistivity, can be correlated to certain types of rock mass conditions. The comparison shows that high resistivity corresponds well with good quality gneiss. The tendency is that low resistivity corresponds to a varying lithology with fractured contacts or merely rock with very poor quality (RQD < 25). The intermediate resistivity agrees often with areas with amphibolite having a dominating RQD of 50-75 (good quality). Even though there are exceptions from this tendency the evaluation has given valuable information about how to use the resistivity data in the future work in the tunnel. Previously there has been a large focus on the low resistivity zone in order to find poor rock conditions. But the comparison has shown that the high resistivity areas are interesting because they give a fair chance for good quality rock. This is just as important for the contractor to know as the location of rock with poor quality.

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The new Col di Tenda tunnel between Italy and France: Integrated geological investigations and geophysical prospections for preliminary studies on the Italian side

Cited by 20 publications

References 2 publications

Investigations of a Cretaceous limestone with spectral induced polarization and scanning electron microscopy

Investigations of a Cretaceous limestone with spectral induced polarization and scanning electron microscopy

Comparison of geoelectrical imaging and tunnel documentation at the Hallandsås Tunnel, Sweden

Comparison between Geoelectrical Imaging and Tunnel Documentation

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