Download or read book Analysis of Mine Backfill Behaviour and Stability written by Zheming Zhu and published by . This book was released on 2002 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Stable mine backfill is necessary for safe working conditions, maximum ore recovery and underground and surface stability. Due to the fact that cement costs can be a significant part of the operating costs in large underground mines, the consumption of cement (or binder) should be minimized. Therefore, developing a safe and economical backfilling method for the large underground mining operations is very significant." --
Download or read book Innovations in Mining Backfill Technology written by F.P. Hassani and published by CRC Press. This book was released on 2021-07-28 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the 4th International Symposium held in Montreal, Oct.2-5, 1989. Paper topics include: review, laboratory testing, modelling and design, rockburst control, soft rock mining, and system design.
Download or read book The Analysis of Mine Backfill Stability at the Golden Grove Project Scuddles Mine written by Ion Hann and published by . This book was released on 1991 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook on Mine Fill written by Yves Potvin and published by . This book was released on 2005 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Use of Past Backfill to Increase Long term Mine Stability and Ore Extraction written by Donovan Benton and published by . This book was released on 2013 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research and experience using various types of mine backfill - hydraulic, rock, paste, and blended - has indicated several benefits to the mining industry. Backfill is a general term that refers to any waste material that is placed into underground mine workings. Paste backfill in particular has shown environmental and economic benefits. Paste fill is generally produced from total mine tailings, meaning that it can include waste rock, sands, and clay-sized particles. It also contains no free water, meaning that water will not flow freely through it after placement causing post filling shrinkage. These characteristics make it the most environmentally "friendly" backfill option currently available. In addition, paste backfill is non-segregating and stackable, containing about 80% solids by weight, and having the consistency of medium-slump concrete, containing a cementitious content. These characteristics make paste backfill the best option for post-mining ground control in room and pillar coal mines. There are two main bodies of research regarding paste backfill. Thefirst studies its composition, application, and performance in past and present mining environments; the second studies its theoretical application for both mine support and waste disposal. While this research has provided much for the burgeoning technology of paste backfill, little has been done to investigate its economic application to the industry in room and pillar coal mines. At present, surface disposal of waste is generally cheaper than underground disposal. The goal of this thesis is to initiate discourse investigating the hypothesis that paste backfill may be used in such a way as to allow for increased coal extraction, which may then not only cover the additional costs of underground waste disposal, but potentially increase overall mine profitability. Inherent to this discourse will be a consideration of the following issues: The potential for increased extraction.Data from three Illinois Basin room and pillar coal mines were collected and used for this thesis. Theoretical computer modeling using LaModel and Phase2, empirical analysis of mine stability, physical testing using simulated paste backfill models, and comparative cost analyses considering current and hypothetical mining scenarios were conducted to identify these potential benefits and their consequences, both theoretical and practical.
Download or read book Mechanics of Mine Backfill written by Mathew Helinski and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Mine backfilling is the process of filling large underground mining voids ("stopes") with a combination of tailings, water and small amounts of cement, to promote regional stability. Stopes are often in excess of 20 m x 20 m in plan dimensions and 40-50 m tall, and can be filled within a week. Barricades are constructed in all tunnels ("drives") that access the stope to contain the backfill material. In recent years, a significant number of failures of mine backfill barricades have occurred, resulting in the inrush of slurry backfill into the mine workings. In addition, sampling has shown material strengths in situ to be far greater than equivalent mixes cured in the laboratory (indicating the potential for reducing the cement content). The purpose of this thesis is to apply soil mechanics principles to the mine backfill deposition process with the intent of providing some insight into these issues. In many cases, filling, consolidation and cement hydration all take place at a similar timescale, and therefore, to understand the cemented mine backfill deposition process it was necessary to appropriately couple these activities. Developing appropriate models for these mechanisms, and coupling them into a finite element code, forms the core of this thesis. Firstly, the fundamental processes involved in the cementing mine backfill deposition process are investigated and represented using theory founded on basic physical observations. Using this theory, one- and two-dimensional finite element models (called CeMinTaCo and Minefill-2D, respectively) are developed to fully couple each of the individual mechanisms. A centrifuge experiment was undertaken to investigate the interaction between consolidation and total stress distribution in a cementing soil. The results of this experiment were also used to verify the performance of Minefill2D. Due to scale effects, the centrifuge experiment was unable to fully couple the interaction of the cement hydration and consolidation timescales. To achieve this, a full scale field experiment was undertaken. The simulated behaviour achieved using Minefill-2D (with independently derived material properties) provided a good representation of the consolidation behaviour. Finally, a sensitivity study carried out using Minefill-2D is presented. This study enables some useful suggestions to be provided for managing the risk of excessive barricade stress, and for preparing laboratory samples to more appropriately represent in situ curing conditions.
Download or read book Minefill 2020 2021 written by Ferri Hassani and published by CRC Press. This book was released on 2021-06-02 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Fatigue Mechanical Behaviors of Rock Backfill Composites Laboratory Study written by Yu Wang and published by Scientific Research Publishing, Inc. USA. This book was released on 2024-07-18 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is intended as a reference book for advanced graduate students and re-search engineers in rock mechanics related to mining engineering. The cemented tailings backfill (CTB) technique is widely used in deep underground mining, since this tech-nique is effective to support surrounding rock, control rockburst, reduce ground sub-sistence, and reduce surface disposal of tailings. Plenty of investigations have been attempted to experimentally or numerically evaluate the strength of CTB with different components (e.g., mixture of cement, tailings, fly ash, blast furnace slag, etc.) to ensure the geological stability when extracting adjacent stopes. After extracting ore from stopes, CTB is filled in the gob, stress redistribution occurs in the backfill stope and surrounding rocks. Due to the elasticity mismatch of these two kinds of material, differential de-formation occurs and they both resist the overburden pressure and deformation. As a result, the interactions between the surrounding rock and tailing backfill material have significant role in maintaining the long-term stability of mine stopes. Apart from the investigations on the static mechanical behaviors of rock- backfill composited backfill (RBCS) material, the RBCS in the stope are also exposed to disturbed stress (e.g., blast vibration, excavation, earthquake, etc.), and the disturbed stress is usually equivalent to cyclic or fatigue loads. As a result, investigations on rock-backfill interactions subjected to the disturbed stress are critical and significant to maintain the long- term stability of mine stopes.
Download or read book Experimental Study of Physical and Mechanical Properties of a Cemented Mine Tailings written by Mohammadamin Jafari and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mechanical properties and behavior of mine backfill need to be better understood in order to increase the reliability of engineered backfill designs in deep and high stress mining conditions. The thesis makes a detailed examination of Cemented Paste Backfill (CPB) from the Williams mine with a range of cement contents, curing times, and confining stresses relevant to underground mining. The first major contribution is understanding how cement hydration alters the density of the backfill's solid components. This understanding facilitates precise and accurate determination of cured backfill's bulk properties, which is critical to accurate interpretations in the context of the next two contributions. The second major contribution is evaluating CPB response to isotropic compression at hydrostatic pressures up to 6.5 MPa, which is particularly relevant when considering how the backfill provides regional ground support during mine-wide ground closure with ongoing ore extraction. Equations of state are developed to quantify the initial elastic response, the onset of bond crushing, and the transition to a compacted state under large confining stress. The final major contribution is understanding CPB shear strength under drained triaxial loading, which is relevant to geomechanical backfill design for mining under, beside or through previously placed backfill. Backfill response is characterized by initially contractive behavior up to a Characteristic State of volumetric strain reversal, leading to peak dilation rate at the Failure State. Equations of state are developed to quantify this behavior. The combined state equations for isotropic and triaxial loading can form the basis for future constitutive models of backfill behavior. Such constitutive models, when incorporated into numerical analysis codes, will provide more confident back-analyses of observed backfill performance, and more realistic assessments of backfill behavior under different proposed mining scenarios. Each of these contributions is novel to CPB research, but also complements the broader body of literature on naturally and artificially cemented soils. Equally important, the thesis provides a framework to examine the mechanical properties and behavior of backfills from other mining operations.
Download or read book Alkali Activated Cements and Concretes written by Caijun Shi and published by CRC Press. This book was released on 2006-05-10 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first English-language book which reviews and summarizes worldwide research advances in alkali-activated cements and concrete. Essential topics include: raw materials and their properties for the production of the two new types of binder the hydration and microstructure development of alkali-activated slag cements the mechanical properties and durability of alkali-activated slag cement and concrete other various cementing systems and their applications related standards and specifications. This respected team of authors has produced an important piece of research that will be of great interest to professionals and academics alike, enabling the production of more durable and environmentally sensitive materials.
Download or read book Geotechnical Behaviour of Frozen Mine Backfills written by Fa Sen Han and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mine Openings Stability and Support written by J. Aldorf and published by Elsevier. This book was released on 2013-10-22 with total page 403 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, the authors present a review of the methods used for the solution of problems of stability and support of mine workings, based on the study and analysis of the validity conditions of individual theoretical computing procedures. The classification of these methods, based on the analysis of factors determining the behaviour of a system of mine openings, should contribute to the greater objectivity of decisions connected with the management and control of mining operations and, from the educational point of view, enable the intricate problems of stability to be better understood. Chapters dealing with support structures and technologies of support review the present state of the art with special reference to problems prevailing in Europe where mining is carried out under continuously deteriorating and less favourable natural conditions.The authors have assembled the theoretical and practical knowledge necessary for those to whom the book is addressed, namely, practising mining engineers and project managers, and students and graduates in mining colleges and schools.
Download or read book Investigation of the Geomechanical Behavior of Mine Backfill and Its Interaction with Rock Walls and Barricades written by Pengyu Yang and published by . This book was released on 2016 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Laboratory Study of Factors Influencing Waterflow in Mine Backfill written by Robert C. Bates and published by . This book was released on 1967 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Support Performance of Hydraulic Backfill a Preliminary Analysis written by John R. M. Hill and published by . This book was released on 1974 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Support of Underground Excavations in Hard Rock written by E. Hoek and published by CRC Press. This book was released on 2000-01-01 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: The safe and economical construction of tunnels, mines, and other subterranean works depends on the correct choice of support systems to ensure that the excavations are stable. These support systems should be matched to the characterstics of the rock mass and the excavation techniques adopted. Establishing the support requirements, designing support systems and installing these correctly are essential elements in safe underground construction. This is a comprehensive and practical work which also gives access to user-friendly computer programmes which enable the investigation and design of support techniques. Details on how to obtain this software are also included in the book.
Download or read book Ground Support in Mining and Underground Construction written by Ernesto Villaescusa and published by Taylor & Francis. This book was released on 2004-09-15 with total page 1270 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of ground support is to safely maintain excavations for their expected lifespan. The effectiveness of ground support can be seen both in terms of personnel and equipment safety, and in terms of allowing the most economic extraction. Scientists, practitioners and technology developers have contributed to this volume, which covers rock ma
