Pillar design - QueensMineDesignWiki
01-01-1980· The paper points out that bord-and-pillar mining is the most important method of coal extraction in South African underground coal mines, and advocates that pillar design procedures should be...
Design of Bord and Pillar method in coal mines
27-02-2016· This is called panel system of mining “Whole” followed by “broken” working in which the mine is opened out by a few headings only and thereafter development and depillaring go on simultaneously. 8. DESIGN OF BORD AND PILLAR WORKING The main elements of Bord and Pillar workings are as follows – 1. Size of the Panel 2.
Design Evaluation of Room and Pillar Workings in Gypsum Mines
01-01-1987· Underground Mining Methods and Technology, edited by A.B. Szwilski and M.J. Richards Elsevier Science Publishers B.V., Amsterdam, 1987 -- Printed in The Netherlands 403 DESIGN EVALUATION OF ROOM AND PILLAR WORKINGS IN GYPSUM MINES R.N. SINGH, M. EKSI and A.G. PATHAN Department of Mining Engineering, University of Nottingham,
Pillar design in coal mines - Journals
Pillar design in coal mines by H. WAGNER*, D. Eng. (Member) SYNOPSIS The paper points out that bord-and-pillar mining is the most important method of coal extraction in South Af~ican underground coal mines, and advocates that pillar design
EVALUATION OF UNDERGROUND COAL PILLAR DESIGN
The most important aspect of Bord and Pillar mining is the design of pillars. The design of pillars not only affects the support of the overburden but also determines the percentage of extraction and design of the ventilation network. The shape and size effect of the pillar also plays an important role.
Pillar design - QueensMineDesignWiki
The strength of pillars are highly dependent on the geological conditions of the mine and there is no universal pillar design method. The following pictures show the potential failure modes that need to be considered for pillar design which are spalling (hourglassing), shear fracturing (geology and stress), bulking/bulging (geology) and foundation failure [7] .:
EVALUATION OF UNDERGROUND COAL PILLAR DESIGN
prevalent in the Indian underground mines is the Bord and Pillar method of mining because of its history and ease of operation. The most important aspect of Bord and Pillar mining is the design of pillars. The design of pillars not only affects the support of the overburden but also determines the percentage of
Design Evaluation of Room and Pillar Workings in Gypsum Mines
01-01-1987· Underground Mining Methods and Technology, edited by A.B. Szwilski and M.J. Richards Elsevier Science Publishers B.V., Amsterdam, 1987 -- Printed in The Netherlands 403 DESIGN EVALUATION OF ROOM AND PILLAR WORKINGS IN GYPSUM MINES R.N. SINGH, M. EKSI and A.G. PATHAN Department of Mining Engineering, University of Nottingham,
The design of stable pillars in the Bushveld
pillar design, bord and pillar mining, stable pillars. * Department of Mining Engineering,, Although this paper focuses on pillar design in hard rock mines, it is worthwhile to investigate the evolution of pillar design in South Africa in general. This will shed some light
EVALUATION OF PILLAR DESIGN SYSTEMS FOR LOW REEF
ensure its safe and economic extraction. The success of a bord and pillar mining method in the exploitation of platinum heavily depends on a comprehensive and competent pillar design method. Pillars need to be large enough to contain load and to be small enough to avoid loss of resource. An optimum pillar design method achieves such a scenario.
COAL PILLAR STRENGTH AND PRACTICAL COAL PILLAR DESIGN,
among pillar design, entry stability, and ventilation efficiency in longwall mining is briefly discussed. Finally, the site-specific nature of coal pillar design is emphasized, and a direction of future research is suggested. USE OF FINITE-ELEMENT MODELING IN PILLAR DESIGN In recent years, FEM has been used to predict in situ coal
(PDF) A review of pillar design for platinum mining to,
28-06-2015· Any bord and pillar platinum mine thrives on effective design of bords and pillars. Pillars have to be large enough to ensure safety and
University of Wollongong Research Online
MINING METHODOLOGY The development of bord and pillar panels at Ensham uses the place change methodology in two stages: The primary development height is typically at 3.5 m, leaving high ash coal in the roof to prevent dilution and provide a competent roof beam. Floor coal (typically 1-1.5 m thick) and bell outs are mined on retreat.
The strength of hard-rock pillars - Rocscience Inc.
Eq. (1) has been applied extensively to the design of pillar layouts in South Africa since its introduction in 1967. While it is tempting to apply Eq. (1) to other pillar designs, it must be remembered that Eq. (1) was developed for room and pillar mining of horizontal coal seams and that the value of K is only typical for South African coal.
VENTILATION PLANNING LAYOUTS FOR LARGE OPENING MINES
should also be considered. Standard room-and-pillar mine layouts are used, but can easily be adapted for staggered or elongated pillars. Split-Mine Ventilation Of the three ventilation methods, split-mine ventilation is the simplest in terms of layout and design, as the mine is split into separate intake and exhaust sides. Split-mine ventilation
Design Evaluation of Room and Pillar Workings in Gypsum Mines
01-01-1987· Underground Mining Methods and Technology, edited by A.B. Szwilski and M.J. Richards Elsevier Science Publishers B.V., Amsterdam, 1987 -- Printed in The Netherlands 403 DESIGN EVALUATION OF ROOM AND PILLAR WORKINGS IN GYPSUM MINES R.N. SINGH, M. EKSI and A.G. PATHAN Department of Mining Engineering, University of Nottingham,
EVALUATION OF PILLAR DESIGN SYSTEMS FOR LOW REEF
ensure its safe and economic extraction. The success of a bord and pillar mining method in the exploitation of platinum heavily depends on a comprehensive and competent pillar design method. Pillars need to be large enough to contain load and to be small enough to avoid loss of resource. An optimum pillar design method achieves such a scenario.
A method of designing bord and pillar workings | Journal,
The object of this study is to formulate a procedure for the determination of mining dimensions in bord and pillar workings. This is achieved by using the recently reported pillar strength formula which was derived statistically from the results of a survey of mining dimensions carried out in the collieries of the Transvaal and Orange Free State.
Pillars B&P.docx - Pillar Design 2.1.2 DESIGN OF BORD AND,
View Pillars B&P.docx from MINING ENG SURFACE MI at Indian Institute of Technology, Dhanbad. Pillar Design 2.1.2 DESIGN OF BORD AND PILLAR LAYOUT Size of Panel The prime factors in deciding the size
(PDF) A review of pillar design for platinum mining to,
28-06-2015· Any bord and pillar platinum mine thrives on effective design of bords and pillars. Pillars have to be large enough to ensure safety and
COAL PILLAR STRENGTH AND PRACTICAL COAL PILLAR DESIGN,
among pillar design, entry stability, and ventilation efficiency in longwall mining is briefly discussed. Finally, the site-specific nature of coal pillar design is emphasized, and a direction of future research is suggested. USE OF FINITE-ELEMENT MODELING IN PILLAR DESIGN In recent years, FEM has been used to predict in situ coal
Bord & Pillar – Mining Science and Technology
Coal mine ventilation systems must be designed so as to maintain at all times healthy and safe atmospheric working conditions. The main purposes of a coal mine ventilation system are to provide adequate quantities of fresh air to the miners in the workings and to render harmless toxic, noxious, and […]
Design of Merensky Reef crush pillars T n s a c t
be considered in the design. In the Bushveld platinum mines, the residual strength criterion is 1 MPa across the stope (Roberts et al.2). This is achieved if the residual strengths of pillars are between 8 MPa and 13 MPa and the pillar lines are spaced 30 m apart. Design of Merensky Reef crush pillars by B.P. Watson*, J.S. Kuijpers†, and T.R,
The strength of hard-rock pillars - Rocscience Inc.
Eq. (1) has been applied extensively to the design of pillar layouts in South Africa since its introduction in 1967. While it is tempting to apply Eq. (1) to other pillar designs, it must be remembered that Eq. (1) was developed for room and pillar mining of horizontal coal seams and that the value of K is only typical for South African coal.
OPTIMIZATION OF MECHANIZED MINING LAYOUT WITHIN ANGLO,
The current mining methods that were evaluated for the purposes of the study were conventional scattered breast mining, bord and pillar (LP) and mechanized breast (XLP) mining. In order to better understand these methods, significant time was spent underground observing each individual method.
