cemented paste backfill geomechanics at a narrowvein

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Cemented Paste Backfill Geomechanics at a Narrow-Vein ...

Cemented Paste Backfill Geomechanics at a Narrow-Vein Underhand Cut-and-Fill Mine Rock Mech Rock Eng . 2019 Dec;52(12):4925-4940. doi: 10.1007/s00603-019-01850-4.

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Cemented Paste Backfill Geomechanics at a Narrow-Vein ...

Jun 10, 2019  10%  At the Lucky Friday Mine, use of cemented paste backfill (CPB)—a high-density mixture of water, classified mill tailings, and cement—in conjunction with mechanized underhand cut-and-fill mining methods has reduced the number of injuries and fatalities caused by mining in deep, high-stress ground conditions, greatly improving the safety of ...

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Cemented Paste Backfill Geomechanics at a Narrow-Vein ...

Mining Publication: Cemented Paste Backfill Geomechanics at a Narrow-Vein Underhand Cut-and-Fill Mine. Underhand cut-and-fill mining has allowed for the safe extraction of ore in many mines operating in weak rock or highly stressed, rockburst-prone ground conditions. However, the design of safe backfill undercuts is typically based on ...

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Cemented Paste Backfill Geomechanics at a Narrow-Vein ...

In situ measurements in backfill are not commonplace, largely due to challenges associated with instrumenting harsh mining environments. In deep, narrow-vein mines, large deformations and induced stresses fracture the cemented fill, often damaging the instruments and

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CDC - Mining Project - Alternative Mining Methods in ...

Oct 01, 2016  Cemented Paste Backfill Geomechanics at a Narrow-Vein Underhand Cut-and-Fill Mine; Coal Mine Safety Applications of Seismic Monitoring; Determination of In Situ Deformation Modulus for Cemented Rockfill; Developments in Sealant Support Systems for Ground Control; Durable Support for Western U.S. Underground Metal Mines

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Cemented Paste Backfill Geomechanics at the Lucky Friday

Cemented Paste Backfill Geomechanics at the Lucky ... for Occupational S afety and Health have worked collaboratively for several years to better understand the geomechanics of cemented paste ...

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CDC - Mining Project - Alternative Mining Methods in ...

Oct 01, 2016  Cemented Paste Backfill Geomechanics at a Narrow-Vein Underhand Cut-and-Fill Mine; Coal Mine Safety Applications of Seismic Monitoring; Determination of In Situ Deformation Modulus for Cemented Rockfill; Developments in Sealant Support Systems for Ground Control; Durable Support for Western U.S. Underground Metal Mines

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Cemented Paste Backfill 1-D Consolidation Results ...

Jun 15, 2020  Understanding the stress and energy transfer from mined-out host rock to emplaced backfill began in the 1960s (Cook et al. 1966; Hodgson and Joughin 1966) and developed over several decades (Salamon 1984; Walsh 1977).However, quantitatively demonstrating these concepts in practice on the mine-wide scale was frustrated by the need to measure stress changes in the host rock and backfill

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Cemented Paste Backfill at Stillwater Mine U.S. Rock ...

Jun 23, 2013  47th U.S. Rock Mechanics/Geomechanics Symposium June 23–26, 2013 San Francisco, California

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Paper: In situ pressures in cemented paste backfill — a ...

Abstract: There is a requirement for better understanding of in situ cemented paste backfill (CPB) behaviour in order to optimise backfilling strategies, i.e. two stage versus continuous pours, pouring rates, time to blast alongside a CPB stope. Furthermore, such data is required to calibrate numerical and analytical models and provide input parameters for laboratory testing of CPB.

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Design guidelines : underhand cut and fill cemented paste ...

Discussions with mine sites revealed the use of sill beams in underhand cut-and-fill mining is not optimized. Optimization in ground support, development of in-situ strength test, and revisions of design standards are desired. Ultimately, the operations require the minimum cemented paste backfill (CPB) strength for a stable span.

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(PDF) Design and implementation of cemented rockfill at ...

3 Implementation of cemented rock fill Cemented Rockfill (CRF) is a mixture of run-of-mine waste rock mixed with cement slurry. Sump mixing with a loader offers the lowest cost form of exposable backfill available for small narrow vein stoping operations.

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[PDF] Underhand Cut and Fill Mining as Practiced in Three ...

Underhand cut and fill mining methods are used at the Lucky Friday, Stillwater, and Galena mines in the western US in an effort to safely mine in difficult ground conditions and as a primary mining method where access below the ore is limited. The method has evolved at each mine to meet the unique situations associated with their milling procedure and mine layout.

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Required Plug Strength for Continuously Poured Cemented ...

Continuously poured paste backfill dramatically improves underground mining efficiency through reduced stope cycle time and simplified logistics. For longhole stopes, a backfill “plug” is poured to a few meters above the undercut brow and must gain sufficient strength to prevent failure through the plug when the “main” pour begins. A novel, rational engineering design approach that ...

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The Potential to Replace Cement with Nano-Calcium ...

Mar 09, 2021  The effectiveness of mine backfilling depends on the properties of its constituents. The high cost of cement, which is commonly used as a binder in mine backfill, has led researchers to seek alternatives to partially replace it with other binders. This study investigated the potential to use nano-calcium carbonate (NCC) and natural pozzolans (zeolite and pumice) along with Portland cement (PC ...

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Jan 01, 1999  Cemented Paste Backfill Geomechanics at a Narrow-Vein Underhand Cut-and-Fill Mine 12/1/2019 - Peer reviewed journal articles An article describing an extensive in situ backfill instrumentation program designed to monitor long-term stope closure and induced backfill stress.

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Welcome to CDC stacks

This paper describes a focus of work presently being conducted at the Rock Mechanics Research Group at the University of British Columbia. The underhand method under consolidated fill ensures a high recovery under an engineered back that is comprised of cemented rock fill and/or cemented paste fill.

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Jan 01, 1999  Cemented Paste Backfill Geomechanics at a Narrow-Vein Underhand Cut-and-Fill Mine 12/1/2019 - Peer reviewed journal articles An article describing an extensive in situ backfill instrumentation program designed to monitor long-term stope closure and induced backfill stress.

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Jan 01, 1992  Cemented Paste Backfill Geomechanics at a Narrow-Vein Underhand Cut-and-Fill Mine 12/1/2019 - Peer reviewed journal articles An article describing an extensive in situ backfill instrumentation program designed to monitor long-term stope closure and induced backfill stress.

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INVESTIGATION OF CEMENTED TAILINGS BACKFILL AND

ii Abstract In this thesis, a comprehensive investigation of using tailings in backfilling material and the percentage of Portland cement and binder composition (a combination of Portland

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Cemented Paste Backfill at Stillwater Mine U.S. Rock ...

Jun 23, 2013  47th U.S. Rock Mechanics/Geomechanics Symposium June 23–26, 2013 San Francisco, California

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An investigation of mechanisms T involved in backfill-rock ...

Cemented rock and paste backfill were developed in 1980s and enabled the use of more efficient mining methods. As a major ... geomechanics design point of view. The ... linear behaviour, rock mechanics, backfill behaviour, narrow vein mining. * Department of Mining and Material Engineering, McGill University, Montreal, Canada.

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Design guidelines : underhand cut and fill cemented paste ...

Discussions with mine sites revealed the use of sill beams in underhand cut-and-fill mining is not optimized. Optimization in ground support, development of in-situ strength test, and revisions of design standards are desired. Ultimately, the operations require the minimum cemented paste backfill (CPB) strength for a stable span.

Get price

Multiphysics Model for Consolidation Behavior of Cemented ...

Aug 14, 2015  In underground mining practices, cemented paste backfill (CPB), a mixture of tailings, cement, and water, is widely adopted to fill extracted stopes. During and after the filling of the underground mine excavations or stopes with CPB, complex multiphysics processes (including thermal, hydraulic, mechanical, and chemical) take place in the CPB mass.

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(PDF) Design and implementation of cemented rockfill at ...

3 Implementation of cemented rock fill Cemented Rockfill (CRF) is a mixture of run-of-mine waste rock mixed with cement slurry. Sump mixing with a loader offers the lowest cost form of exposable backfill available for small narrow vein stoping operations.

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Improved strength prediction of cemented paste backfill ...

May 17, 2021  The cemented paste backfill (CPB) technology has matured as a promising way for tailings recycling in the mining industry. Nevertheless, the current CPB design requires a large number of lab experiments to determine the unconfined compressive strength (UCS) of CPB.

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Required Plug Strength for Continuously Poured Cemented ...

Continuously poured paste backfill dramatically improves underground mining efficiency through reduced stope cycle time and simplified logistics. For longhole stopes, a backfill “plug” is poured to a few meters above the undercut brow and must gain sufficient strength to prevent failure through the plug when the “main” pour begins. A novel, rational engineering design approach that ...

Get price

[PDF] Strength and Elastic Properties of Paste Backfill at ...

At underground mines where cemented backfill is used for ground support, backfill strength properties are an important design consideration, particularly for underhand cut-and-fill mining operations where employees work directly beneath the placed fill. Following a backfill roof fall at a deep underground silver mine, standard tests were conducted to determine the strength and elastic ...

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[PDF] Design Spans - Underhand Cut And Fill Mining ...

This paper describes a focus of work presently being conducted at the Rock Mechanics Research Group at the University of British Columbia. The underhand method under consolidated fill ensures a high recovery under an engineered back that is comprised of cemented rock fill and/or cemented paste fill. This method of mining is generally necessary either due to a weak rock mass comprising the ...

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(PDF) Evaluation of Viscosity, Strength and ...

minerals Article Evaluation of Viscosity, Strength and Microstructural Properties of Cemented Tailings Backfill Shuai Cao 1,2, * ID , Erol Yilmaz 3, * ID and Weidong Song 1,2, * 1 School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education ...

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A Solution to the Time-Dependent Stress Distribution in ...

Mar 23, 2021  The creep behavior of deep weak rock masses is important due to an underground opening. Appreciating the nature and source of these deformations requires the knowledge of rock mass and ground support interaction. The theoretical solution of the backfill’s internal stresses needs to consider the time-dependent effect. In the present study, the coupling interaction between the creep

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