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The sliding friction of rock, involving all kinds of particles at the contact surface, is relevant to many problems, ranging from those in artificial engineering to earthquake dynamics. In this work, the frictional performance of the shale rock-dry quartz sand contact was investigated using a self-developed testing device. The study showed that the coefficient of friction of the contact increases with nominal stress and that the corresponding friction force increases approximately linearly with nominal stress, which is directly related to the contact stress between each single sand particle and rock shale. An overall dynamic coefficient, γ, reflecting the response of friction force to nominal stress, first decreases and then increases with area ratio, which is determined by not only the contact stress but also the interparticle friction force. These have important repercussions for a preliminary understanding of the frictional properties of the shale rock-dry quartz sand contact in hydraulic fracturing and related industrial applications.


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Sliding friction of shale rock on dry quartz sand particles

Show Author's information Huijie ZHANG1Shuhai LIU1,2( )Huaping XIAO1,2( )
College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, Beijing 102249, China
State Key Laboratory of Oil and Gas Resources and Engineering, China University of Petroleum-Beijing, Beijing 102249, China

Abstract

The sliding friction of rock, involving all kinds of particles at the contact surface, is relevant to many problems, ranging from those in artificial engineering to earthquake dynamics. In this work, the frictional performance of the shale rock-dry quartz sand contact was investigated using a self-developed testing device. The study showed that the coefficient of friction of the contact increases with nominal stress and that the corresponding friction force increases approximately linearly with nominal stress, which is directly related to the contact stress between each single sand particle and rock shale. An overall dynamic coefficient, γ, reflecting the response of friction force to nominal stress, first decreases and then increases with area ratio, which is determined by not only the contact stress but also the interparticle friction force. These have important repercussions for a preliminary understanding of the frictional properties of the shale rock-dry quartz sand contact in hydraulic fracturing and related industrial applications.

Keywords: shale rock, quartz sand, frictional performance, hydraulic fracturing

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Publication history

Received: 12 October 2016
Revised: 09 May 2017
Accepted: 09 March 2018
Published: 04 December 2018
Issue date: August 2019

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© The author(s) 2018

Acknowledgements

Support by National Natural Science Foundation of China (No. 51575529) is acknowledged.

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