Micromechanical experiments using a new inter-granule loading apparatus on gravel to ballast-sized materials

Chitta Sai SANDEEP; Kostas SENETAKIS

doi:10.1007/s40544-018-0243-5

Friction 2020, 8(1): 70-82 https://doi.org/10.1007/s40544-018-0243-5

Research Article |

Open Access | Issue | Published: 23 February 2019

Micromechanical experiments using a new inter-granule loading apparatus on gravel to ballast-sized materials

Show Author's Information Hide Author's Information Chitta Sai SANDEEP, Kostas SENETAKIS(

)

City University of Hong Kong, Hong Kong SAR, China

Keywords:

contact mechanics, experimental micromechanics, linear bearings, inter-particle friction, granite, debris flow, ballast

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Sai SANDEEP C, SENETAKIS K. Micromechanical experiments using a new inter-granule loading apparatus on gravel to ballast-sized materials. Friction, 2020, 8(1): 70-82. https://doi.org/10.1007/s40544-018-0243-5

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Abstract

Micromechanical and tribological studies of geological materials with a particular focus on their contact-mechanics behavior at the grain scale are currently a major interest in the engineering and geoscience disciplines. In this study, a new robust micromechanical apparatus developed at the City University of Hong Kong is described; it is capable of conducting inter-granule (or inter-particle) loading tests on fine gravel to ballast-sized materials of sizes as small as 5−10 mm to granules (or ballast) as big as 50 mm. The focus of our study is the description of the major technical features of the new apparatus and its performance and repeatability in conducting experiments on reference grains of chrome steel balls and glass balls; in addition, we conducted a preliminary set of experiments on crushed granitic rock, which is a material widely used in geotechnical and transportation infrastructure. The representative results of these experiments are presented in terms of the normal force-displacement relationship, friction, and tangential stiffness. The newly developed large-size apparatus is further compared with a well-established apparatus that can conduct micromechanical tests on sand-sized materials.

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Micromechanical experiments using a new inter-granule loading apparatus on gravel to ballast-sized materials

Show Author's information Hide Author's Information Chitta Sai SANDEEP, Kostas SENETAKIS(

)

City University of Hong Kong, Hong Kong SAR, China

Abstract

Keywords: contact mechanics, experimental micromechanics, linear bearings, inter-particle friction, granite, debris flow, ballast

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Acknowledgements

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Publication history

Received: 02 August 2017

Revised: 09 February 2018

Accepted: 27 August 2018

Published: 23 February 2019

Issue date: February 2020

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Acknowledgements

The study was fully supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Theme-based research project Scheme "Understanding Debris Flow Mechanisms and Mitigating Risks for a Sustainable Hong Kong" - Project No. T22-603/15 N (CityU 8779012)). Dr. M. C. Todisco is acknowledged for her contribution during the development of the apparatus as well as Prof. M. R. Coop for his kind suggestions and discussions throughout the development of the micromechanical apparatus at City University and his invaluable contribution in the development of the computer code used with the apparatus. Mr. Thomas Tsang (technician of City University) is greatly acknowledged for his patient and continuous technical support in the development of the new micromechanical apparatus.

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