A Design Procedure For Determining The In Situ Stresses Of Early Age Cemented Paste Backfill
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A Design Procedure For Determining The In Situ Stresses Of Early Age Cemented Paste Backfill
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Author : Ryan Llewellyn Veenstra
language : en
Publisher:
Release Date : 2013
A Design Procedure For Determining The In Situ Stresses Of Early Age Cemented Paste Backfill written by Ryan Llewellyn Veenstra and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Minefill 2020 2021
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Author : Ferri Hassani
language : en
Publisher: CRC Press
Release Date : 2021-06-02
Minefill 2020 2021 written by Ferri Hassani and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-06-02 with Technology & Engineering categories.
The series of International Symposiums on Mining with Backfill explores both the theoretical and practical aspects of the application of mine fill, with many case studies from both underground and open-pit mines. Minefill attendees and the Proceedings book audience include mining practitioners, engineering students, operating and regulatory professionals, consultants, academics, researchers, and interested individuals and groups. The papers presented at Minefill symposiums regularly offer the novelties and most modern technical solutions in technology, equipment, and research. In that way, the papers submitted for the Minefill Symposia represent the highest quality and level in the conference domain. For the 2020-2021 edition organizers hope that the papers presented in this publication will also be received with interest by readers around the world, providing inspiration and valuable examples for industry and R&D research.
Paste Tailings Management
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Author : Erol Yilmaz
language : en
Publisher: Springer
Release Date : 2017-03-03
Paste Tailings Management written by Erol Yilmaz and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-03-03 with Technology & Engineering categories.
This book provides an overview of paste tailings disposal at mine sites. It deals comprehensively with the characterization of sulphide-rich tailings, geotechnical and microstructural behaviour, surface tailings disposal applications, underground paste backfilling, and case studies. The authors place emphasis on the characterization, monitoring, disposal and treatment, as well as environmental considerations of problematic sulphidic tailings. The framework is supported by worldwide case studies.
Proceedings Of The 37th International Conference On Ground Control In Mining
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Author : Brijes Mishra
language : en
Publisher: Society for Mining, Metallurgy & Exploration
Release Date : 2018-07-16
Proceedings Of The 37th International Conference On Ground Control In Mining written by Brijes Mishra and has been published by Society for Mining, Metallurgy & Exploration this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-07-16 with Technology & Engineering categories.
The International Conference on Ground Control in Mining has a rich history of advancing ground control techniques and knowledge. It provides a unique platform for researchers, regulators, consultants, manufacturers, and mine operators to present and exchange challenging industry topics as well as to expedite solutions to ground control problems that require immediate attention. This proceedings from the 37th International Conference is no exception. It includes 47 peer-reviewed research papers from industry experts covering topics of importance for today and the future.
Imm Abstracts
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Author : Institution of Mining and Metallurgy (Great Britain)
language : en
Publisher:
Release Date : 2003
Imm Abstracts written by Institution of Mining and Metallurgy (Great Britain) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Metallurgy categories.
Liquefaction Of Early Age Cemented Paste Backfill
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Author : Abdolreza Saebimoghaddam
language : en
Publisher:
Release Date : 2010
Liquefaction Of Early Age Cemented Paste Backfill written by Abdolreza Saebimoghaddam and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Modern mines require systems that quickly deliver backfill to support the rock mass surrounding underground openings. Cemented Paste Backfill (CPB) is one such backfilling method, but concerns have been raised about CPB's liquefaction susceptibility especially when the material has just been placed, and if it is exposed to earthquakes or large mining induced seismic events. Conventional geotechnical earthquake engineering for surface structures is now relatively advanced and well accepted, and so the objective of this thesis is to consider how that framework might be extended to assess the liquefaction potential of CPB. Seismic records were analyzed for earthquakes and for large mining induced events. Important seismological trends were consistent for rockbursts and earthquakes when the signals were recorded at distances as proximate as one kilometre, suggesting that the conventional earthquake engineering approach might plausibly be adapted for such design situations. For production blasts and for more proximate locations to rockbursts, much higher frequencies dominate and therefore new design methods may be required. Monotonic triaxial tests conducted on normally consolidated uncemented mine tailings demonstrated that the material is initially contractive up to a phase transition point, beyond which dilation occurs. Most importantly the material never exhibits unstable strain softening behaviour in compression, and only temporary or limited liquefaction in extension. The addition of 3% binder results in initial sample void ratios that are even higher than their uncemented counterparts, and yet the material friction is slightly enhanced when tested at 4 hours cure. These results suggest that the flow liquefaction phenomenon commonly associate with undrained loose sand fills will not occur with paste backfill. Cyclic triaxial test results analyzed in terms of number of cycles to failure for a given cyclic stress ratio exhibited a trend consistent with previous tests on similar materials. However, the addition of 3% binder and testing at 4 hours cure resulted in an order of magnitude larger number of cycles to failure - a surprising and dramatic increase, suggesting good resistance of the material to cyclic mobility. Future research is recommended to build on these results and develop more robust methods for liquefaction assessment of CPB.
Early Age Mechanical Behavior And Stiffness Development Of Cemented Paste Backfill With Sand
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Author : Abdullah Abdelaal
language : en
Publisher:
Release Date : 2011
Early Age Mechanical Behavior And Stiffness Development Of Cemented Paste Backfill With Sand written by Abdullah Abdelaal and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
A Critical State Approach To The Mechanical Behavior Of Early Age Cemented Paste Backfill
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Author : Amin B. Ghorbanpour
language : en
Publisher:
Release Date : 2021
A Critical State Approach To The Mechanical Behavior Of Early Age Cemented Paste Backfill written by Amin B. Ghorbanpour and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with Controlled low-strength materials categories.
Early Age Mechanical Behavior And Stiffness Development Of Cemented Paste Backfill With Sand
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Author : Abdullah Muhammad Galaa Muhammad Idris Abdelaal
language : en
Publisher:
Release Date : 2011
Early Age Mechanical Behavior And Stiffness Development Of Cemented Paste Backfill With Sand written by Abdullah Muhammad Galaa Muhammad Idris Abdelaal and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Rapid delivery of backfill to support underground openings attracted many mines to adopt paste backfilling methods. As a precaution to prevent liquefaction and to improve the mechanical performance of backfills, a small portion of a binder is added to the paste to form the cemented paste backfill (CPB). Recently, adding sand to mine tailings (MT) in CPB mixes has attracted attention since it enhances the flow and mechanical characteristics of the pastefill. This thesis investigates the effects of adding sand to CPB on the undrained mechanical behavior of the mixture (CPBS) under monotonic and cyclic loads. Liquefaction investigations took place at the earliest practically possible age. Beyond this age, the present research focused on characterizing the evolution of stiffness and obtaining the values of the stiffness parameters that could be useful for designing and modeling backfilling systems.The evolution of effective stiffness parameters for two CPB-sand mixtures was monitored in a non-destructive triaxial test for five days. Self-desiccation was found to not be influential on the development of early age stiffness. Moreover, a framework is suggested to predict the undrained stiffness at degrees of saturation representative of the field. The credibility of the proposed test in providing stiffness parameters at representative strain levels of the field was verified.The liquefaction investigation involved monotonic compression and extension triaxial tests. Neither flow nor temporary liquefaction was observed for all cemented and uncemented specimens under monotonic compression, while temporary liquefaction was observed for all specimens under monotonic extension. The addition of binder and sand to MT was found to slightly strengthen the pastefill in compression while weakening it in extension. Under cyclic loading, the addition of sand negatively impacted the cyclic resistance. However, binder was found to be more effective in the presence of sand. All specimens exhibited a cyclic mobility type of response.
An Experimental Study Of Cementing Paste Backfill
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Author : Megan Walske
language : en
Publisher:
Release Date : 2014
An Experimental Study Of Cementing Paste Backfill written by Megan Walske and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
[Truncated abstract] This thesis focuses on experimental element testing of cementing paste backfill (CPB) to examine and improve on existing laboratory testing techniques. Specifically, the work focuses on developing a framework to account for differences in curing conditions between in situ and laboratory environments, given the recognised improvement in mechanical properties of in situ cured CPB. This has been explored within the effective stress framework by making use of a hydration cell testing apparatus. The existing hydration cell set-up was modified to allow control over the rate of temperature increase and final temperature of specimens during curing, to replicate in situ curing conditions. The combination of elevated curing temperature and effective stress generation was found to significantly increase the mechanical properties of CPB compared with curing at elevated effective stress and ambient temperatures. The current procedure for curing under effective stress can be expensive and time consuming. As such, the standard test method for chemical shrinkage of hydraulic cement paste (ASTM C1608-07) was investigated as a potential index/screening test for use in the design of CPB mixes through comparison of the chemical shrinkage-induced strain generated in both the ASTM and hydration cell tests. The appropriate use of this ASTM standard with CPB was validated despite the high w/c ratio of typical CPB mixes.