Relevant bibliographies by topics / Mine backfill

Academic literature on the topic 'Mine backfill'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "Mine backfill"

1

Mitchell, Robert J. "Centrifuge model tests on backfill stability." Canadian Geotechnical Journal 23, no. 3 (August 1, 1986): 341–45. http://dx.doi.org/10.1139/t86-048.

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The 6 m diameter, 30 g-tonne geotechnical centrifuge at Queen's University is described. Results from eight model tests, carried out on plain cemented sand samples representing mine backfills, are presented. These data show that the stable prototype backfill heights obtained from centrifuge tests exceed the failure heights predicted from unconfined compression testing by factors averaging about 1.8. This factor is explained by a combination of geometrical and behavioural effects. Still photographs of typical backfill failures in the centrifuge are included and these indicate that unacceptable ore dilution and recovery costs would be associated with the prototype failures in plain cemented tailings backfills. Key words: geotechnical centrifuge, mine backfill, model tests, cemented sand.
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Hefni, Mohammed, and Ferri Hassani. "Experimental Development of a Novel Mine Backfill Material: Foam Mine Fill." Minerals 10, no. 6 (June 23, 2020): 564. http://dx.doi.org/10.3390/min10060564.

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This study aims to develop a novel mine backfill material called foam mine fill (FMF). A cellular structure is achieved by incorporating a premade foam into the backfill mixture using an air-entraining agent. FMF samples were prepared with copper-nickel mine tailings and normal Portland cement. Experiments were designed to investigate the effect of binder dosage, volume of entrained air, and foam mixing time on FMF unconfined compressive strength (UCS) and dry density. Moreover, a qualitative microscopic assessment investigated the effect of foam mixing time on air bubble structure. The pore size distribution and porosity of selected samples were investigated through mercury intrusion porosimetry. Relative to reference samples without entrained air, the UCS of FMF samples was 20–50% lower. However, the concomitant lower dry density (by up to 360 kg/m3) could enhance the safety of the underground working environment, especially in underhand cut-and-fill mining where miners and machinery work beneath the backfilled stope, and lower-density fill material would minimize the adverse effects of potential backfill failure. Prolonged foam mixing time led to a significant loss in UCS and total collapse of the air bubble structure. Other potential applications for FMF are areas where there are tailings shortages and as an alternative to hydraulic fill.
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Nujaim, Mutaz, Tikou Belem, and Albert Giraud. "Experimental Tests on a Small-Scale Model of a Mine Stope to Study the Behavior of Waste Rock Barricades during Backfilling." Minerals 10, no. 11 (October 23, 2020): 941. http://dx.doi.org/10.3390/min10110941.

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This paper presents a reduced-scale physical model of a mine stope used to reproduce the underground stope backfilling practiced in some Canadian mines. The objective is to study the geomechanical behavior of the waste rock barricades in interaction with the mine backfill. The instrumentations, along with visual observations and preliminary results, are presented. The main results demonstrated that: (i) the stability of the barricade depends on its physical properties (e.g., size, location, particles gradation and compaction) and the frictional behavior at the barricade/drift walls interface, and (ii) for two backfill formulations, cemented and uncemented, prepared with 70% of solid mass concentration, the volumetric strain due to self-weight consolidation of the backfilled room was higher for uncemented backfill (16%) than for the cemented one (4.5%). In addition, the results highlighted the importance of using shotcrete around the downstream face of the barricade, mostly at the top, to close the gaps and bind the barricade particles, which improves its stability.
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Emad, Muhammad Zaka, Hani Mitri, and Cecile Kelly. "Effect of blast-induced vibrations on fill failure in vertical block mining with delayed backfill." Canadian Geotechnical Journal 51, no. 9 (September 2014): 975–83. http://dx.doi.org/10.1139/cgj-2013-0305.

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Numerical modelling has long been used as a powerful tool for geomechanics mine design and analysis of such problems as ore dilution. Open stoping mining method with delayed backfill is generally employed for mining steeply dipping tabular ore deposits. Several authors reported that consideration of production blast vibrations on adjacent, exposed backfill faces is crucial for the effective backfill design for minimum ore dilution due to fill failure. In this study, it is shown that blast vibrations can be characterized with dynamic numerical modelling. A FLAC3D dynamic numerical model has been developed for a typical layout of a secondary stope that is being mined next to a previously mined and backfilled primary stope. The numerical simulations are validated by comparing predicted failure geometry with laser-surveyed stope profiles obtained with a cavity monitoring system. It is shown that blast-induced vibrations can be a primary cause for wedge-type failure of the backfill face.
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Li, Li. "Analytical solution for determining the required strength of a side-exposed mine backfill containing a plug." Canadian Geotechnical Journal 51, no. 5 (May 2014): 508–19. http://dx.doi.org/10.1139/cgj-2013-0227.

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Backfilling is well known in the mining industry. A basic issue associated with mine backfill design is the determination of the strength of the backfill required to maintain the stability of the backfill body upon removal of a side wall when an adjacent secondary stope is excavated. This task is usually accomplished using a solution proposed by Mitchell et al. in the early 1980s. Recently, this solution has been reviewed and a modified solution has been proposed. These existing solutions, however, were developed for a uniform backfill. In practice, mine stopes are usually divided into primary and secondary stopes. Primary stopes are often backfilled in two stages: a plug pour and a final pour. In many cases, the cement content of the plug pour is higher than that of the final pour. The positive effect of the stronger plug is neglected in both the original and the modified Mitchell et al. solutions. Here, a new analytical solution is developed for estimating the required strength of a laterally exposed backfill by taking the plug into account. The proposed solution reduces to the modified Mitchell et al. solution if the plug pour and final pour have the same cement content. If the plug pour has a cement content higher than that of the final pour, the required backfill strength calculated with the proposed solution is lower than the values estimated with the modified Mitchell et al. solution; the same conclusion can be drawn to the comparison between the proposed solution and the original Mitchell et al. solution when the bond cohesion along the side walls is close to the cohesion of the backfill. Furthermore, the proposed solution indicates that an optimal cohesion ratio between the plug and final pours exists: there is no benefit in using excessively high cement content in the plug pour. It is noted that the proposed solution is valid only for high, narrow backfilled stopes, solutions for low and wide backfilled stopes are under development.
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Lu, Rong, Fengshan Ma, Jie Zhao, Jianbo Wang, Guilin Li, and Bing Dai. "Monitoring and Analysis of Stress and Deformation Features of Boundary Part of Backfill in Metal Mine." Sustainability 12, no. 2 (January 20, 2020): 733. http://dx.doi.org/10.3390/su12020733.

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The backfill mining method is widely used in metal mines. A large and thick backfill body has formed in the No.2 zone of Jinchuan Nickel Mine, and its stability is critical for mining safety. In order to study the mechanical behavior of the boundary part of backfill, ground subsidence monitoring, underground filed monitoring of displacement, and stress and numerical simulation were conducted to analyze stress distribution and deformation of backfill. According to underground monitoring, the bed separated displacement has the consistent trend with ground subsidence in the mine area. Based underground stress monitoring, both horizontal and vertical stress of the internal part of backfill is less than the stress boundary part of the backfill. The characteristic of backfill boundary outline is a step-profile. Contact interaction between the surrounding rock and backfill led to complex stress distribution. According to stress monitoring of the boundary points in a numerical model, the multi-peak value of stress development is the major feature of the boundary part of backfill. The multi-peak stress behavior of the boundary part of backfill was influenced by mining depth. The boundary part of backfill deformation influenced the local stability of mining. This article provided a scientific basis for strength design and the support choice of a metal mine by the method of backfill mining.
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Guo, Li Jie, Ke Ping Zhou, Xiao Cong Yang, Guang Sheng Liu, and Wen Yuan Xu. "An Experimental Study on the Mechanical Properties of Cemented Rock-Tailings Fill." Advanced Materials Research 941-944 (June 2014): 2611–19. http://dx.doi.org/10.4028/www.scientific.net/amr.941-944.2611.

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This paper outlines an effective approach to making composite backfill using mine waste material. Composite materials are widely used in many areas of engineering because of their unique structural properties. Cemented rock-tailings are one of the most prevalent materials used for composite backfill because they can effectively make use of mine waste rock and mill tailings that would otherwise be simply considered waste. This backfill method has the capability of maintaining the mine environment while still allowing for continued mine development. An experimental study is being conducted in a cooperative mine research project to investigate the properties of backfill material and specifically the mechanical characteristics of cemented waste rock-tailings fill. This study details the characteristics of the composite backfill aggregate with respect to the compressive strength of the cemented rock-tailings fill and the backfill mix-proportion, as well as outlines a new method of study for cemented rock-tailings fill mechanics. The study results show the compressive strength of cemented rock-tailings fill is dependent mainly on the cement and waste rock content. Ensuring a precise backfill mix proportion can effectively reduce the cement dosage, thereby decreasing the backfill cost realized for the mine.
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Zhao, Xin-yuan, Xin-wang Li, Ke Yang, Zhen Wei, and Qiang Fu. "The segmental subsidence structure with immediate roof of gob side entry retaining in backfill mining." Energy Exploration & Exploitation 39, no. 4 (March 15, 2021): 1262–82. http://dx.doi.org/10.1177/0144598721996540.

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When gob side entry retaining is carried out in backfill mining, the roof will show different subsidence morphology due to the difference of compactness and supporting force of the backfill body at different positions. This paper analyzed the immediate roof subsidence structure under two extreme conditions, constructed the roof segmented subsidence structure and the mechanical model of roadside backfill body, and used FLAC3D software to investigate the roof migration and the force law of the roadside backfill body under the conditions of different goaf backfilled rates, different width and strength of roadside backfill body. Finally, the backfill practice of a mine in Shandong Province of China is taken as an example for analysis. The results show that the segmented subsidence structure of the immediate roof is related to the mechanical properties of the roadside backfill body and the goaf backfill body. When the backfilled rate of goaf decreases from 95% to 70%, the width of roadside backfill body decreases from 5 m to 1 m, and the elastic modulus decreases from 10 GPa to 0.5 GPa, the greater difference in the subsidence and inclination of the immediate roof on both sides of the roadside backfill body is, the more obvious the segmented subsidence structure characteristics of the immediate roof are, and the greater force on the roadside backfill body will be, the more unfavorable it is to maintain the stability of the roadway surrounding rock and the roadway backfill body. Therefore, when gob side entry retaining is carried out in backfill mining, the surrounding rock structure and the force on roadside backfill body should be considered comprehensively.
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Jaouhar, El Mustapha, and Li Li. "Effect of Drainage and Consolidation on the Pore Water Pressures and Total Stresses within Backfilled Stopes and on Barricades." Advances in Civil Engineering 2019 (May 12, 2019): 1–19. http://dx.doi.org/10.1155/2019/1802130.

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The pore water pressures (PWPs) and total stresses during the placement of a slurried backfill in underground mine stopes are the key parameters for the design of barricades, built to retain the backfill in the stopes. They can be affected by the drainage and consolidation of the backfill. Over the years, several studies have been reported on the pressure and stresses in backfilled stopes by accounting for the drainage and consolidation. Most of them focused on the pressure and stresses in the stopes, few specifically on the barricades. The effect of the number of draining holes commonly installed through the barricade has never been studied. In this paper, the influence of hydraulic properties and filling rate of the backfill, stope size, barricade location, and number of draining holes is systematically investigated with numerical simulations. The results show that the stresses in the backfilled stope and on the barricade largely depend on the filling rate, hydraulic conductivity, and Young’s modulus of the backfill. The draining holes can significantly decrease the PWP, but only slightly the total stresses on the barricades in short term.
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El Mkadmi, Nawfal, Michel Aubertin, and Li Li. "Effect of drainage and sequential filling on the behavior of backfill in mine stopes." Canadian Geotechnical Journal 51, no. 1 (January 2014): 1–15. http://dx.doi.org/10.1139/cgj-2012-0462.

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Underground backfilling offers significant economic and environmental advantages to mining operations. There is however a limited knowledge and understanding of how the backfill behaves within mine stopes, which creates some concern regarding the risk of accidents with potentially serious consequences. It is thus important to investigate further the response of backfill to ensure safe working conditions and optimize the filling sequence. This paper presents key results from a numerical study aimed at analyzing the hydrogeotechnical response of backfill in a narrow vertical stope. The simulations illustrate how stresses are influenced by stope geometry, water drainage, and filling rate. Three main cases are presented here to illustrate these effects; namely, (i) simulation of dry (or drained) backfill, (ii) a rapidly filled stope with progressive drainage and consolidation, and (iii) sequential backfill placement with different filling rates. The third case includes a simulation with evolving properties due to the binder added to the backfill. The results from the numerical analyses show that arching effects develop within narrow backfilled stopes because of the stiffness contrast between the rock and the fill material. This can produce a significant reduction of the stresses (horizontal and vertical) in comparison with the overburden pressure. The simulation results also show the development of excess pore-water pressures after the placement of the saturated backfill within the stope. Drainage tends to reduce these pressures and increase the frictional stresses along the rock walls. The sequentially filled stope simulations show that a rapid filling rate produces much higher total stresses and excess pore-water pressures, compared to slower rates. The simulation of the cemented backfill, with evolving properties, indicates that the progressive changes can have a significant effect on the total and effective stresses in the stope. A discussion follows on the implications of these results.
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Dissertations / Theses on the topic "Mine backfill"

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O'Neill, Mark A. "Creep settlement of opencast mine backfill." Thesis, Sheffield Hallam University, 2007. http://shura.shu.ac.uk/20148/.

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The extraction of a significant amount coal in the United Kingdom has over the last four or so decades been made using opencast mining methods. This method involves large-scale excavation to reach the coal seams (with depths often exceeding 100m). Following extraction various forms of restoration have been employed, including backfilling the mine void with material excavated in order to extract the coal. This backfilling was frequently undertaken in an uncontrolled fashion. In recent years it has been more usual to engineer the restoration such that further development of the site can take place. However, settlement remains the major obstacle to development. One mode of settlement commonly encountered on restored sites is creep settlement. Further, on older sites whose restoration was, most probably, undertaken in an uncontrolled way, the potential for creep settlement. is the major obstacle. Creep settlement is understood to be that component of total settlement which, in a coarse granular soil, takes place under conditions of constant stress. It is generally accepted to occur linearly with the decadic logarithm of time. This study investigates the phenomenon from the visualisation of the granular particle mechanics. The technique used for the visualisations is computed tomography (CT), a technique which is common in medical diagnostics but has rarely been exploited in soil mechanics and never at the scale employed in the study. The use of CT supplements a programme of high quality, large scale laboratory testing, which models typical opencast coal mine backfill. The testing programme has revealed that compaction and the diagenesis of the source materials have a significant effect on the creep rate. Further, that the creep rate is defined in the most part by the aggregation of small or minor movements rather being dominated by large or major movements.
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Han, Fa Sen. "Geotechnical Behaviour of Frozen Mine Backfills." Thèse, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/20250.

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This thesis presents the results of an investigation of factors which influence the geotechnical properties of frozen mine backfill (FMB). FMB has extensive application potential for mining in permafrost areas. The uniaxial compressive strength (UCS) of hardened backfill is often used to evaluate mine backfill stability. However, the deformation behaviour and stiffness of the FMB are also key design properties of interest. In this thesis, uniaxial compressive tests were conducted on FTB and FCPB samples. Information about the geotechnical properties of FMB is obtained. The effects of FMB mix components and vertical compression pressure on the geotechnical properties of FMB are discussed and summarized. An optimum total water content of 25%-35% is found in which the strength and the modulus of elasticity of the FTB are 1.4-3.2 MPa and 35-58 MPa, respectively. It is observed that a small amount (3-6%) of cement can significantly change the geotechnical properties of FTB.
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Zhu, Zheming 1965. "Analysis of mine backfill behaviour and stability." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=84453.

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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.
In this thesis, first laboratory tests and in-situ tests are implemented to determine backfill material properties and backfill stress distribution. The laboratory tests include high sulphide paste fill property tests and layered backfill tests. Second, a backfill finite element model is presented and it is validated by the results of laboratory tests and in-situ tests. Finally, by using this model, the following subjects are studied, (1) backfill stress distribution; (2) influences of backfill material properties and dimensions on backfill stability; (3) stress distribution of layered backfill; (4) optimum layered backfill. The results show that: (a) The variation of backfill material properties is quite large, the compressive strength of the layered backfill model is much higher than that of the non-layered backfill model, and the backfill vertical stress is much less than that anticipated by the formula, rhogH; (b) During the process of adjacent pillar recovery, the minor principal stress inside a backfill is tensile, and this tensile principal stress causes backfill failure and spalling near the exposed surfaces. The spalling size progressively increases with the height of the exposed surface, and a sliding zone creates and leads to backfill collapse; (c) Optimum backfill material should be high elastic modulus, high Poisson's ratio and low density. Optimum backfill size should be large depth and small width; (d) For layered backfill, no sliding zone occurs during the process of adjacent pillar recovery, so layered backfill can improve backfill stability. The optimum layered backfill should consist of strong layers distributed evenly with thicknesses of 1~2m and weak layers 2~2.5 times the thickness of the strong layers. This can save binder consumption by about 11%.
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Aldhafeeri, Zaid. "Reactivity of Cemented Paste Backfill." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/38111.

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Mining has been one of the main industries in the course of the development of human civilization and economies of various nations. However, every industry has issues, and one of the problems the mining industry has faced is the management of waste, especially sulphide-bearing tailings, which are considered to be a global environmental problem. This issue puts pressure on the mining industry to seek alternative approaches for tailings management. Among the several different types of methods used, cemented paste backfilling is one of the technologies that offers good management practices for the disposal of tailings in underground mines worldwide. Cemented paste backfill (CPB) is a cementitious composite made from a mixture of mine tailings, water and binder. This technology offers several advantages, such as improving the production and safety conditions of underground mines. Among these advantages, CPB is a promising solution for the management of sulphidic tailings, which are considered to be reactive materials (i.e., not chemically stable in an atmospheric condition) and the main source of acid mine drainage, which constitutes a serious environmental challenge faced by mining companies worldwide. Such tailings, if they come into direct contact with atmospheric elements (mainly oxygen and water), face oxidation of their sulphidic minerals, thus causing the release of acidic drainage (i.e., acid mine drainage) and several types of heavy metals into surrounding water bodies and land. Therefore, the reactivity of sulphidic tailings with and without cement content can be considered as a key indicator of the environmental behavior and durability performance of CPB systems. For a better understanding of the reactivity, it is important to investigate the influencing factors. In this research, several influencing factors are experimentally studied by conducting oxygen consumption tests on different sulphidic CPB mixtures as well as their tailings under different operational and environmental conditions. These factors include time, curing temperature, initial sulphate content, curing stress, mechanical damage, binder type and content, and the addition of mineral admixtures. In addition, several microstructural techniques (e.g., x-ray diffraction and scanning electron microscopy) are applied in order to understand the changes in the CPB matrices and identify newly formed products. The results reveal that the reactivity of CPB is affected by several factors (e.g., curing time, initial sulphate content, ageing, curing and atmospheric temperature, binder type and content, vertical curing stress, filling strategy, hydration and drainage, etc.), either alone or in combination. These factors can affect reactivity either positively or negatively. It is observed that CPB reactivity decreases with increasing curing time, temperature (i.e., curing and atmospheric temperatures), curing stress, binder content, the addition of mineral admixtures, degree of saturation, and the binder hydration process, whereas reactivity increases with increases in sulphide minerals (e.g., pyrite), initial sulphate content, mechanical damage, and with decreased degrees of saturation and binder content. The effect of sulphate on the reactivity of CPB is based on the initial sulphate content as well as curing time and temperature. It is concluded that the reactivity of CPB systems is time- and temperature-dependent with respect to other factors. Also, binders play a significant role in lowering CPB reactivity due to their respective hydration processes.
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Blanchfield, Richard. "Volume change characteristics of opencast coal mine backfill." Thesis, University of Sheffield, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.480898.

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Piciacchia, Luciano 1959. "Field and laboratory studies of mine backfill design criteria." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74360.

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This work develops a backfill design procedure aimed to facilitate the optimization of an available mine material in order to meet target objectives in a particular mining role. This required the compilation and analysis of data on fill usage, established design procedures, physical and geomechanical properties, testing techniques and procedures, as well as behavioural modelling methods.
A backfill classification system is proposed based upon size distribution. A series of design equations are presented which relate to this system. These equations represent the means by which backfill geomechanical behaviour can be related to physical properties. This is considered to be fundamental to an effective backfill design procedure. Derivation of the equations has been based upon analysis of data from a program of laboratory and in situ testing conducted in ten operating Canadian mines by the author, together with other published work.
The in situ testing required the development of a pressuremeter testing procedure novel to underground mining. The theoretical basis for the employment of pressuremeter data has been examined and behavioral equations have been developed to describe the deformation and stress history during a backfill material test. In addition two new equations have been developed for the analysis of pressuremeter data. The in situ data collected has been correlated with laboratory derived geomechanical data for the same backfill materials.
The geomechanical properties associated with the proposed backfill classifications have also been related to their influence on backfill behaviour in three mine backfill roles: free standing stability during pillar recovery in bulk mining methods; dynamic interaction with stope walls in rockburst prone ground; and ability to reduce stresses in highly stressed rock masses. This work has been based on new and established modelling methods and aims to provide insight into the effectiveness of the backfill classes in these roles of growing practical significance.
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Bouzaiene, Riadh. "On the flow mechanics of mine backfill slurries in pipelines." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=28992.

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This thesis deals with the flow mechanics of hydraulic and high density mine backfill slurries in pipelines. Various empirical, rheological and mechanistic approaches are presented and analysed along with some aspects pertinent to experimental testing of backfill slurries.
The main contribution of this work is, particularly, in the development of an analytical model to describe the flow and predict the pressure gradient of a class of high density backfill whose motion in pipelines follows the Plug Flow Model (PFM). The development of the model called for investigating the conditions required for establishing Plug Flow. It was found that mix proportioning procedures, similar to those found in the concrete industry, are key factors in obtaining Plug Flow.
Pressure drop was found to be a function of the thickness of the Bingham plastic annular layer surrounding the cylindrical core of aggregates. Analytical equations were proposed to solve for the thickness of this layer by considering the rheology of the mixture. Alternatively, the thickness of the annular layer may be estimated by considering the relative proportions of the mixture with respect to aggregates void content. The model offered pressure drop predictions in good agreement with published data. The proposed model may also serve as an alternative to Mooney's method, when dealing with the annular lubricating layer effect characterising mixtures in Plug Flow.
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Fadaei, Kermani Mehrdad. "An investigation into a new binder for hydraulic backfill /." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112568.

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Over the last three decades, mine backfilling has progressively integrated into underground mining operations. The high stresses associated with mining at depth in the Canadian Shield, also requires innovative approaches to mine backfilling to withstand the loading both during and after mining operations. Not only new or modified minefill systems are required, but also new techniques are needed to increase the speed of the mining cycle for optimizing the mining operation. Three major purposes of mine backfill are known as (1) providing safe working condition, (2) maximizing ore recovery and (3) improving underground stability. Therefore, mine backfill has contributed greatly to the economics and environmental aspects of mining industry.
In order to improve the mechanical behaviour of fill, cementitious materials are used. These cementitious materials are expensive. As a result the consumption of these cementitious materials has to be optimized and minimized in a way that the required strength is met. The objective of this research is to investigate a new type of backfill, which is known as gelfill. Gelfill binders usually consist of alkali activators such as sodium silicate and the other cementitious materials. Sodium silicate has been used in waste treatment and activation of artificial pozzolans such as blast furnace slag and fly ash.
The work presented in this thesis is to evaluate the use of sodium silicate in gelfill. Consequently, the influence of mixing time, mixing sequence and curing time are studied on gelfill and silica sand hydraulic backfill. Various tests including unconfined and confined compressive strength were conducted in order to investigate the mechanical behaviour of samples. By conducting mercury intrusion porosimetery (MIP) and scanning electron microscopy (SEM), microstructure and mineralogical properties of specimens were studied.
The result of this thesis demonstrates that gelfill compared with silica sand hydraulic backfill has better mechanical properties. In addition, other variables, including: mixing time and sequence, have a significant effect on gelfill.
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Bowman, Charles H. "Geotechnical charcterization of coal refuse for use as a backfill material." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-08182009-040343/.

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Van, Tonder Warren Deon. "Centrifuge modelling of permeability in a heterogeneous coal mine backfill sequence." Diss., University of Pretoria, 2015. http://hdl.handle.net/2263/57291.

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Opencast mining has been and continues to be a favoured method for the extraction of the vast coal reserves in the Highveld of South Africa. Previously backfilled and restored open cast areas are generally zoned for agricultural uses, but with growing pressures on land use, such areas are increasingly being considered for the expansion of infrastructure and regional development. Understanding the backfill permeability and hydraulic behaviour is therefore an important component in defining the land use restrictions placed on a previously backfilled area. Centrifuge modelling provides a means of better understanding the hydraulic behaviour and measuring the permeability of opencast backfill under controlled laboratory conditions. Based on a preselected backfill prototype, an appropriate centrifuge model was developed. Using miniature pore pressure transducers, the pore pressures were measured at discrete locations in the model during falling head tests in a geotechnical centrifuge. Using the measured volumetric discharge, spacing between the transducers and the measured pore pressures, the permeability of the backfill was calculated. Due to polarized opinions on the scaling of permeability in a centrifugal field, a control model was tested at 1g and 23g to validate this scaling law. It was demonstrated that the respective permeabilities calculated at 1g and 23g were effectively the same and that it is in fact the hydraulic gradient that is scaled N times in the centrifuge. Knowing this allowed the calculated centrifuge permeabilities to be directly related to the prototype represented by the model. To determine the accuracy of the centrifuge model, the results of field percolation tests were compared to the results of an analogous centrifuge model. There was no correlation between the results and it was not considered meaningful to compare the results, as the model and percolation test site (prototype) conditions differed significantly. To simulate the preselected prototype backfill sequence, a model configuration that represented the geometry and material properties of the prototype was tested at 35g (half scale) and 70g (full scale) in the centrifuge. The results of the centrifuge model were used to make reasonable predictions on the long term permeability and hydraulic behaviour of the backfill prototype. It was found that the permeability of the backfill is likely to decrease over time due to consolidation settlement. The bottom of the backfill sequence is expected to have the lowest permeability and the top is likely to maintain a higher permeability. It was further demonstrated that the horizon interfaces acted as flow restrictors and resulted in poor vertical permeability between the horizons in the backfill sequence. Overall the centrifuge methodology provided a unique and efficient means of modelling the long term permeability and hydraulic behaviour of the backfill sequence.
Dissertation (MSc)--University of Pretoria, 2015.
tm2016
Geology
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Books on the topic "Mine backfill"

1

Boldt, C. M. K. Backfill properties of total tailings. Pgh. [Pittsburgh], PA: U.S. Dept. of the Interior, Bureau of Mines, 1989.

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Boldt, C. M. K. Backfill properties of total tailings. Washington, DC: Dept. of the Interior, 1988.

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Newman, Philip. The preparation and transportation of paste backfill. Montréal, Qué: Dept. of Mining and Metallurgical Engineering, McGill University, 1992.

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Canada Centre For Mineral and Energy Technology. Mineral Research Program. Notes on Denison Mine Pillar-Backfill Confinement Tests. S.l: s.n, 1985.

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Firla, Ross. Flow behavior of Garson Mine paste backfill in pipelines. Sudbury, Ont: Laurentian University, School of Engineering, 2000.

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International Symposium on Mining with Backfill (4th 1989 Montréal, Québec). Innovations in mining backfill technology: Proceedings of the 4th International Symposium on Mining with Backfill, Montréal, 2-5 October 1989. Rotterdam: Balkema, 1989.

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International Symposium on Mining with Backfill (4th 1989 Montréal, Québec). Innovations in mining backfill technology: Proceedings of the 4th International Symposium on Mining with Backfill, Montreal, 2-5 October 1989. Rotterdam: A. A. Balkema, 1989.

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Tesarik, D. R. Evaluation of in situ cemented backfill performance. Washington, D.C: U.S. Dept. of the Interior, Bureau of Mines, 1991.

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Tesarik, D. R. Evaluation of in situ cemented backfill performance. Washington, DC: U.S. Dept. of the Interior, Bureau of Mines, 1991.

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Milliken, L. D. Beneficial use of industrial by-products for hydraulic salt mine backfill. S.l: s.n, 1994.

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Book chapters on the topic "Mine backfill"

1

Snyman, Barend Jacobus. "Boulby Mine Backfill System." In Paste Tailings Management, 267–82. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-39682-8_11.

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Oliver, P. H., and D. Landriault. "The convergence resistance of mine backfills." In Innovations in Mining Backfill Technology, 433–36. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003211488-54.

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Emad, Muhammad Zaka, Isaac Vennes, Hani Mitri, and Cecile Kelly. "Backfill Practices for Sublevel Stoping System." In Mine Planning and Equipment Selection, 391–402. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-02678-7_38.

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McKinstry, J. D., and P. M. Laukkanen. "Fill operating practices at Isa Mine – 1983-1988." In Innovations in Mining Backfill Technology, 361–68. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003211488-45.

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Kaskiw, L. M., R. M. Morgan, and D. C. Ruse. "Backfilling at IMC Canada K-2 potash mine." In Innovations in Mining Backfill Technology, 315–25. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003211488-39.

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Wu, Di. "Properties of Cemented Tailings Backfill." In Mine Waste Management in China: Recent Development, 57–114. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9216-1_6.

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Piciacchia, L., M. Scoble, and J. M. Robert. "Field studies by full displacement pressuremeter in mine backfills." In Innovations in Mining Backfill Technology, 247–56. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003211488-30.

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Brechtel, C. E., M. P. Hardy, J. Baz-Dresch, and J. S. Knowlson. "Application of high-strength backfill at the Cannon Mine." In Innovations in Mining Backfill Technology, 105–17. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003211488-15.

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Şenyur, G. "The time effect on flow through mine backfill materials." In Innovations in Mining Backfill Technology, 415–23. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003211488-52.

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Wu, Di. "Case Study of Cemented Tailings Backfill." In Mine Waste Management in China: Recent Development, 115–22. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9216-1_7.

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Conference papers on the topic "Mine backfill"

1

Martinson Munoz, Karl, Robert Cooke, and Nicolas Rosales. "Cabildo Mine Backfill System." In International Seminar on Paste and Thickened Tailings. Australian Centre for Geomechanics, Perth, 2005. http://dx.doi.org/10.36487/acg_repo/563_21.

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Bloss, Martyn. "An operational perspective of mine backfill." In Eleventh International Symposium on Mining with Backfill. Australian Centre for Geomechanics, Perth, 2014. http://dx.doi.org/10.36487/acg_rep/1404_0.2_bloss.

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Wilson, Stephen, Barend Snyman, Maureen McGuinness, John Albrecht, and John de Vries. "Gwalia mine – backfill system operational review." In 18th International Seminar on Paste and Thickened Tailings. Australian Centre for Geomechanics, Perth, 2015. http://dx.doi.org/10.36487/acg_rep/1504_26_wilson.

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de Moura, Walter, Edvaldo Barbosa, Wayne Grobbelaar, and Steve Dorman. "Cuiabá Mine Tailings and Backfill System." In International Seminar on Paste and Thickened Tailings. Australian Centre for Geomechanics, Perth, 2005. http://dx.doi.org/10.36487/acg_repo/563_19.

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Lindqvist, Thomas, Anders Nystrom, P. Brodin, and L. Norling. "Paste Backfill at Garpenberg North Mine." In Ninth International Seminar on Paste and Thickened Tailings. Australian Centre for Geomechanics, Perth, 2006. http://dx.doi.org/10.36487/acg_repo/663_26.

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Hefni, Mohammed, Feramarz Hassani, Michelle Nokken, Mehrdad Kermani, and Dan Vatne. "Investigation into the development of foam mine fill." In Eleventh International Symposium on Mining with Backfill. Australian Centre for Geomechanics, Perth, 2014. http://dx.doi.org/10.36487/acg_rep/1404_02_hefni.

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Widisinghe, Sankha, Nagaratnam Sivakugan, and Vincent Wang. "Loads on barricades in hydraulically backfilled underground mine stopes." In Eleventh International Symposium on Mining with Backfill. Australian Centre for Geomechanics, Perth, 2014. http://dx.doi.org/10.36487/acg_rep/1404_08_widisinghe.

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Mgumbwa, Juma, and Trent Nester. "Paste improvement at La Mancha’s Frog’s Leg underground mine." In Eleventh International Symposium on Mining with Backfill. Australian Centre for Geomechanics, Perth, 2014. http://dx.doi.org/10.36487/acg_rep/1404_22_mgumbwa.

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Li, Jianping, Johan Ferreira, and Tim Le Lievre. "Transition from discontinuous to continuous paste filling at Cannington Mine." In Eleventh International Symposium on Mining with Backfill. Australian Centre for Geomechanics, Perth, 2014. http://dx.doi.org/10.36487/acg_rep/1404_30_li.

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Asakura, Kuniomi. "Trial of Paste Backfill at Toyoha Mine (Keynote)." In ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37381.

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Abstract:
Flow properties of paste made of dewatered mine tailings and a binder were investigated by means of a transportation test using pipelines of 4 inches and 8 inches in diameter at Toyoha Mine. In addition to full-scale tests at the mine, laboratory tests using small-scale pipes were carried out. In this paper, results of flow properties of the paste are presented and various problems during underground backfill are described.
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Reports on the topic "Mine backfill"

1

Dewers, Thomas, Jason E. Heath, and Christi D. Leigh. FY:15 Transport Properties of Run-of-Mine Salt Backfill ? Unconsolidated to Consolidated. Office of Scientific and Technical Information (OSTI), September 2015. http://dx.doi.org/10.2172/1223168.

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Schuhen, Michael, and Kristopher Kuhlman. Summary of initial test results for Transport Properties of Run-of-Mine Salt Backfill. Office of Scientific and Technical Information (OSTI), September 2014. http://dx.doi.org/10.2172/1164614.

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Jordan, Amy B., Philip H. Stauffer, Donald T. Reed, Hakim Boukhalfa, Florie Andre Caporuscio, and Bruce Alan Robinson. Draft Test Plan for Brine Migration Experimental Studies in Run-of-Mine Salt Backfill. Office of Scientific and Technical Information (OSTI), February 2015. http://dx.doi.org/10.2172/1169146.

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Henghu Sun and Yuan Yao. Research and Development of a New Silica-Alumina Based Cementitious Material Largely Using Coal Refuse for Mine Backfill, Mine Sealing and Waste Disposal Stabilization. Office of Scientific and Technical Information (OSTI), June 2012. http://dx.doi.org/10.2172/1048945.

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Udd, J. E. Backfill research in Canadian mines. Natural Resources Canada/CMSS/Information Management, 1989. http://dx.doi.org/10.4095/325861.

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Geomechanics of reinforced cemented backfill in an underhand stope at the Lucky Friday Mine, Mullan, Idaho. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, July 2001. http://dx.doi.org/10.26616/nioshpub2001138.

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Geochemical processes and the effects of natural organic solutes on the solubility of selenium in coal-mine backfill samples from the Powder River basin, Wyoming. US Geological Survey, 1995. http://dx.doi.org/10.3133/wri954200.

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