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Browsing by Author "Malan, DF"

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Computer modelling of granular material microfracturing

Author: Malan, DF ; Napier, JAL Date: 15 Aug 1995 Microscopic observations indicate that intra- and transgranular fracturing are ubiquitous processes in the damage of rock fabrics. Extensive modelling of intergranular fracturing has been carried out previously using the distinct-element ... Read more
Deep gold mine fracture zone behaviour

Author: Napier, JAL ; Malan, DF ; Sellers, E ; Daehnke, A ; Hildyard, MW ; Dede, T ; Shou, K-J Date: Dec 1998 The investigation of the behaviour of the fracture zone surrounding deep level gold mine stopes is detailed in three main sections of this report. Section 2 outlines the ongoing study of fundamental fracture process and their numerical ... Read more
Experimental investigation of fundamental processes in mining induced fracturing and rock instability.

Author: Napier, JAL ; Drescher, K ; Hildyard, MW ; Kataka, MO ; Malan, DF ; Sellers, EJ Date: Mar 2002 The main themes of the project GAP601b have been experimental investigations of creep effects, further underground observations of time-dependent behaviour, investigation of scale effects and rock mass stability and studies of the interaction ... Read more
Experimental validation of a mine-wide continuous closure monitoring system as a decision making tool for gold mines

Author: Malan, DF ; Grave, M ; Napier, JAL ; Piper, PS ; Lawrence, LE Date: Mar 2003 Previous fundamental research projects have indicated the value of continuous closure measurements for improved support design and hazard assessment and for quantifying the effect of seismicity on stope closure. This project examined the ... Read more
Experimental validation of a mine-wide continuous closure monitoring system as a decision making tool for gold mines.

Author: Malan, DF ; Grave, M ; Napier, JAL ; Piper, PS ; Lawrence, LE Date: Mar 2003 Previous fundamental research projects have indicated the value of continuous closure measurements for improved support design and hazard assessment and for quantifying the effect of seismicity on stope closure. This project examined the ... Read more
Feasibility of a mine-wide continuous closure monitoring system for gold mines.

Author: Malan, DF ; Kononov, VA ; Coetzer, SJ ; Janse van Rensburg, AL ; Spottiswoode, BS Date: Sep 2000 Previous fundamental research projects have indicated the value of continuous closure measurements for improved support design and hazard assessment and for quantifying the effect of seismicity on stope closure. This project examines the ... Read more
Numerical simulation of a multi-reef tabular mining layout in a South African platinum mine

Author: Napier, JAL ; Malan, DF Date: Sep 2008 Some of the key problems facing rock engineers on mines in the Bushveld Complex are design of stable panel spans, optimum pillar dimensions and assessing hangingwall stability. A particularly difficult problem is encountered in some mines ... Read more
Propagation of fractures from an interface in a Brazilian test specimen

Author: Malan, DF ; Napier, JAL ; Watson, BP Date: Dec 1994 The influence of an interface on the initiation and propagation of fractures was investigated using the Brazilian tensile test (diametral compression of a disc). Failure in the Brazilian test takes the form of an extension fracture in the ... Read more
Simulating the time-dependent behaviour of excavations in hard rock

Author: Malan, DF Date: Oct 2002 Although hard rock is not usually associated with large creep deformation, data collected from the tunnels and stopes of the deep South African gold mines illustrates significant time-dependent behaviour. Apart from application in mining, a ... Read more
Survey and assessment of techniques used to quantify the potential for rock mass instability.

Author: Brink, AVZ ; Hagan, TO ; Spottiswoode, SM ; Malan, DF ; Glazer, SN ; Lasocki, S Date: Mar 2000 The development of techniques to quantify the potential for rockmass instability that may result in rockbursts, has been a priority for researchers in the South African gold mining industry for some decades. These techniques include numeric ... Read more
Time-dependent behaviour of deep level tabular excavations in hard rock

Author: Malan, DF Date: Apr 1999 Although hard rock is not usually associated with large creep deformation, significant time-dependent behaviour is observed in the tabular excavations of the South African gold mines. Time-dependent closure data was collected in stopes of the ... Read more
Viscoplastic discontinuum model of time-dependent fracture and seismicity effects in brittle rock

Author: Napier, JAL ; Malan, DF Date: Oct 1997 A model is proposed for the direct mechanistic simulation of seismic activity and stress transfer effects in deep level mines. The model uses a discontinuum viscoplastic formulation to relate the rate of slip on a crack to the shear stress ... Read more

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Browsing by Author "Malan, DF"

Browsing by Author "Malan, DF"

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All of ResearchSpace

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