Investigation of shear strength and breakdown of mine waste rock

Xu, Youwei, Williams, David and Serati, Mehdi (2017). Investigation of shear strength and breakdown of mine waste rock. In: 51st US Rock Mechanics/Geomechanics Symposium. 51st US Rock Mechanics/Geomechanics Symposium, San Francisco, CA United States, (). 25-28 June 2017.

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Author Xu, Youwei
Williams, David
Serati, Mehdi
Title of paper Investigation of shear strength and breakdown of mine waste rock
Conference name 51st US Rock Mechanics/Geomechanics Symposium
Conference location San Francisco, CA United States
Conference dates 25-28 June 2017
Convener American Rock Mechanics Association
Proceedings title 51st US Rock Mechanics/Geomechanics Symposium
Place of Publication San Francisco, California, USA
Publisher ARMA
Publication Year 2017
Sub-type Fully published paper
Open Access Status Not yet assessed
Total pages 7
Language eng
Abstract/Summary To investigate the shear strength of mine waste rock, large-scale laboratory direct shear tests were carried out on Breccia, Weathered Shale, Breccia on Weathered Shale, and Weathered Shale on compacted clay, under applied normal stresses of 250 kPa, 500 kPa or 1000 kPa. The Breccia, Weathered Shale and Breccia on Weathered Shale samples were loosely-placed and tested dry, representing the bulk of the waste rock dump volume in the field. The Weathered Shale on compacted clay was tested under both dry and wet (the worst case) conditions to represent the interface between Weathered Shale and compacted clay liners within waste rock dumps. The peak shear and normal stresses were corrected for area reduction and plotted to provide the shear strength envelopes, from which shear strength parameters were recommended. To assess the potential for breakdown of the waste rock on wetting, particle size distribution curves were obtained by dry and wet sieving. Also, slake durability indices were obtained for Breccia and Weathered Shale by carrying out slake durability tests. Overall, the results indicated negligible potential for breakdown of the Breccia and Weathered Shale on wetting.
Keyword Shear strength
Breakdown
Mine waste rock
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Conference Paper
Collections: School of Civil Engineering Publications
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Created: Wed, 05 Jul 2017, 14:55:46 EST by Youwei Xu on behalf of School of Civil Engineering