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Mudrocks as Soft Rocks: Properties and Characteristics

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Soft Rock Mechanics and Engineering

Abstract

Soft rocks comprise the geological materials with poor mechanical characteristics that span the range between soils and hard rocks. Mudrocks are part of the broader group of soft rocks which correspond to fine-grained, clay-rich detrital sedimentary rocks. As mudrocks constitute more than 60% of all sedimentary rocks and occur frequently in geological sequence, they are often encountered in construction sites either in their natural undisturbed state or as construction materials. Mudrocks can show a range of engineering behaviours as function of their composition and structural features; however, by reputation, they are regarded as poor engineering materials in construction displaying low strength and durability as well as susceptibility to volume changes. This chapter aims to provide a framework of the main geological and engineering geological aspects of mudrocks that control their engineering properties and behaviour. With this concern, the key controls on the formation of mudrocks, the terminology used to classify fine-grained sedimentary rocks and the main geological and geotechnical characteristics of mudrocks, including the relevant laboratory techniques are presented as well as the geological and engineering geological classifications of mudrocks are reviewed. Finally, a set of case studies of mudrocks encountered in commonly occurring civil engineering works are described.

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Acknowledgements

The authors would like to thank Dr. John Cripps of the University of Sheffield for the helpful suggestions and comments that result in significant improvements to this chapter.

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Authors and Affiliations

  1. Laboratório Nacional de Engenharia Civil, Lisbon, Portugal

    Filipe Telmo Jeremias

  2. Universidad Nacional de Colombia-Bogotá, Bogotá, Colombia

    Juan Montero Olarte & Mario Camilo Torres Suárez

  3. University of Évora, Évora, Portugal

    António B. Pinho & Isabel M. R. Duarte

  4. National Technical University of Athens, Athens, Greece

    Haris Saroglou

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  1. Filipe Telmo Jeremias
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  2. Juan Montero Olarte
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  3. António B. Pinho
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  4. Isabel M. R. Duarte
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  5. Haris Saroglou
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  6. Mario Camilo Torres Suárez
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Correspondence to Filipe Telmo Jeremias .

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Editors and Affiliations

  1. Polytechnical School, University of São Paulo, São Paulo, São Paulo, Brazil

    Milton Kanji

  2. State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology (Beijing), Tongji University, Beijing, China

    Manchao He

  3. Department of Civil Engineering, University of Porto, Porto, Portugal

    Luís Ribeiro e Sousa

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Jeremias, F.T., Olarte, J.M., Pinho, A.B., Duarte, I.M.R., Saroglou, H., Torres Suárez, M.C. (2020). Mudrocks as Soft Rocks: Properties and Characteristics. In: Kanji, M., He, M., Ribeiro e Sousa, L. (eds) Soft Rock Mechanics and Engineering . Springer, Cham. https://doi.org/10.1007/978-3-030-29477-9_4

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