Microstructural degradation of Maastrichtian limestones

D. J.M. Ngan-Tillard, W. Verwaal, P. M. Maurenbrecher, L. A. Van Paassen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

The Maastrichtian in The Netherlands is composed of a series of calcarenites and calcisiltites with layers of flints. At some locations, boreholes have revealed the presence of carbonate sands rather than rock. Several scenarios are proposed to explain the observed lack of cohesion and better predict the spatial distribution of the carbonate sands in the Maastrichtian. A 3D Leica microscope, an Environmental Electronic Microscope (ESEM) and a desktop micro-Computerized Tomography scanner (micro-CT scan) have been used to characterize differences in the micro-structures of limestone and carbonate sands samples. Grain crushing, the presence of a mud matrix binding up grains and the lack of a well developed calcite fringe cementation are observed in the carbonate sands and not in the calcarenites. Degradation during core recovery cannot be excluded. Cone penetration and pressuremeter tests in between rigid layers are recommended to detect any layer with an extremely weak cementation and high deformability.

Original languageEnglish (US)
Title of host publicationRock Engineering in Difficult Ground Conditions - Soft Rocks and Karst - Proceedings of the Regional Symposium of the International Society for Rock Mechanics, EUROCK 2009
Pages321-326
Number of pages6
StatePublished - Dec 1 2010
Externally publishedYes
EventRegional Symposium of the International Society for Rock Mechanics: Rock Engineering in Difficult Ground Conditions - Soft Rocks and Karst, EUROCK 2009 - Dubrovnik, Cavtat, Croatia
Duration: Oct 29 2009Oct 31 2009

Publication series

NameRock Engineering in Difficult Ground Conditions - Soft Rocks and Karst - Proceedings of the Regional Symposium of the International Society for Rock Mechanics, EUROCK 2009

Other

OtherRegional Symposium of the International Society for Rock Mechanics: Rock Engineering in Difficult Ground Conditions - Soft Rocks and Karst, EUROCK 2009
CountryCroatia
CityDubrovnik, Cavtat
Period10/29/0910/31/09

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geotechnical Engineering and Engineering Geology

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  • Cite this

    Ngan-Tillard, D. J. M., Verwaal, W., Maurenbrecher, P. M., & Van Paassen, L. A. (2010). Microstructural degradation of Maastrichtian limestones. In Rock Engineering in Difficult Ground Conditions - Soft Rocks and Karst - Proceedings of the Regional Symposium of the International Society for Rock Mechanics, EUROCK 2009 (pp. 321-326). (Rock Engineering in Difficult Ground Conditions - Soft Rocks and Karst - Proceedings of the Regional Symposium of the International Society for Rock Mechanics, EUROCK 2009).