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Browsing by Author "Roberts, David P"

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Alternative support systems for mechanized stopes

Author: Roberts, David P ; Roberts, MKC ; Jager, AJ Date: May 2005 The stoping of platinum orebodies in the Bushveld has in the past been accomplished by using in-stope pillars to ensure stability of the workings. In the future, the use of continuous mining machines to mine the platinum orebodies is probable, ... Read more
Calibration of a numerical model for bore-and-fill mining

Author: Roberts, David P Date: Jul 2017 Bore-and-fill mining was implemented at a pilot site in Tau Tona mine’s shaft pillar on 97 level. Observations, scan data and measurements from this site were used to calibrate an inelastic numerical model of bore-and-fill mining within the ... Read more
Development of a method to estimate coal pillar loading

Author: Roberts, David P ; Van der Merwe, JN ; Canbulat, I ; Sellers, EJ ; Coetzer, S Date: Sep 2002 The primary goal of this project was to determine the accuracy and validity of the Tributary Area Theory (TAT) and to provide better estimates of pillar load using numerical modelling and other tools. Literature review highlighted that previous ... Read more
Experimental and in-situ physical properties measurements from a seismogenic zone in a deep South African mine

Author: Nkosi, N ; Manzi, M ; Roberts, David P ; Durrheim, R ; Ogasawara, H ; Ziegler, M ; Liebenberg, B ; Onstott, T Date: Sep 2022 Since the 1990s, South Africa has experienced several sizeable earthquakes occurring in mining regions at depths ranging between 2 km and 4 km below the surface. These consist of the Welkom (ML 4.2) and Stilfontein (ML 5.3) earthquakes, which ... Read more
Impact of soft loading conditions on the performance of elongate support elements.

Author: Daehnke, A ; Watson, BP ; Roberts, David P ; Acheampong, E ; Van Zyl, M Date: Mar 2000 This project investigates the mechanisms of the rotation and oblique movement of blocks, and analyses the capabilities of elongates to support such unstable blocks. To this end, theoretical, laboratory and underground studies are conducted ... Read more
Improved understanding of the use of short tendons for stope support under rockfall and rockburst conditions, (Phase I).

Author: Roberts, David P ; Roberts, MKC ; Acheampong, E Date: Mar 2002 The aim of this project was to determine whether the introduction of short bolts into a stope hangingwall would increase the stability of the hangingwall beam. A simple physical 1/10th hangingwall model was constructed out of concrete, with ... Read more
The influence of stemming practice on ground vibration and airblast

Author: Mpofu, Mvikel ; Ngobese, Sibusiso SG ; Maphalala, B ; Roberts, David P ; Khan, Sumaya Date: Jan 2021 This paper details an assessment of stemming practices at a South African opencast coal mine and their influence on ground vibration and air blast. Quantitative and qualitative analysis methods were used for the study. The parameters assessed ... Read more
Integration of underground mapping, petrology, and high-resolution microseismicity analysis to characterise weak geotechnical zones in deep South African gold mines

Author: Mngadi, SB ; Durrheim, RJ ; Manzi, MSD ; Ogasawara, H ; Yabe, Y ; Yilmaz, H ; Wechsler, N ; Van Aswegen, G ; Roberts, David P Date: Feb 2019 A highly-stressed shaft pillar is prone to large seismic events, falls of ground and rockbursts, which may cause injuries and loss of production, especially in weak geotechnical zones. It is thus important to identify weak geotechnical zones ... Read more
Investigations into the residual strength of a 2.5 m wide Bushveld Merensky Reef crush pillar

Author: Watson, BP ; Mosomane, SM ; Kuijpers, JS ; Roberts, David P Date: Aug 2008 The first crush pillars on the Bushveld platinum mines were introduced at Union Section in 1978. Before the introduction of crush pillars, serious problems were experienced when stoping advanced to a point 30 m to 40 m on both sides of the ... Read more
Observational studies of the rock mass response to mining in highly-stressed gold mines in South Africa

Author: Ogasawara, H ; Nakatani, T ; Durrheim, RJ ; Naoi, M ; Yabe, Y ; Moriya, H ; Hofmann, GF ; Stander, C ; Roberts, David P ; De Bruin, P ; Oelofse, J ; Kato, H ; Cichowicz, A ; Birch, D ; Ngobeni, D ; Milev, A ; Kgarume, Thabang E ; Satoh, T ; Horiuchi, S ; Kawakata, H ; Murakami, O ; Yoshimitsu, N ; Ward, AK ; Wienand, J ; Lenegan, P ; Yilmaz, H ; Mngadi, S ; Piper, PS ; Clements, TN ; Nakao, S ; Okubo, M ; Ishii, H ; Visser, AV Date: Sep 2014 A multi-disciplinary study of the response of the rock mass to mining and mining-induced earthquakes has been conducted in six gold mines in South Africa at sites deeper than 3 km, or with equivalent stress. More than 80 holes (with a total ... Read more

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Browsing by Author "Roberts, David P"

Browsing by Author "Roberts, David P"

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