Geotechnical Factors Affecting High- and Low-wall Stability in Opencast Coal Mine
by Grant van Heerden | May 2004
R1500,00
Description
Related Products
Simulation of Regional Collapses in Bord & Pillar Workings
2018
Three dimensional modelling of a documented subsidence event in the Witbank coalfield, aimed at reserves in the seam above old workings that current pillar strength formulae sterilise.
What this report foundFinite element simulation reproduced the rapid collapse of bord and pillar workings in the 2 Seam at a Witbank colliery, showing that progressive pillar...
R1500,00
Finite element simulation reproduced the rapid collapse of bord and pillar workings in the 2 Seam at a Witbank colliery, showing that progressive pillar deterioration triggers snap through of a strong sandstone plate in the overburden. Too little was known about the chosen collapse to back out a real pillar safety factor, so the calibration goal was not met.
Evaluation of Three Native Grass Species and a Tree Species for Coal Mine Rehabilitation
2009
Field trials established on prepared topsoil at three Mpumalanga Highveld collieries and measured to 2007, covering survival, cover, biomass and tree growth, for rehabilitation planners.
What this report foundCynodon dactylon outperformed Themeda triandra and Hyparrhenia hirta, reaching 100 per cent survival and cover at all three trial sites by 2007 with or without...
R1500,00
Cynodon dactylon outperformed Themeda triandra and Hyparrhenia hirta, reaching 100 per cent survival and cover at all three trial sites by 2007 with or without fertiliser. Acacia sieberana reached 97 per cent survival at Kleinkopje Colliery but grew poorly at Optimum and Syferfontein. Planting plugs suits slopes too steep for a planter machine and buffers against pasture grass intrusion.
R1500,00