ResearchSpace
→
Browsing by Author

Browsing by Author "Napier, JAL"

Now showing items 1-19 of 19

Authors' reply to Discussion by E. Siebrits and S. L. Crouch regarding the paper "A two-dimensional linear variation displacement discontinuity method for three-layered elastic media", International Journal of Rock Mechanics and Mining Sciences, Vol. 36, No. 6, pp. 719-729, 1999

Author: Shou, KJ ; Napier, JAL Date: Jul 2000 This paper is about the reply to discussion by E. Siebrits and S. L. Crouch regarding the paper "A two-dimensional linear variation displacement discontinuity method for three-layered elastic media". The purpose of the paper was to apply a ... Read more
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
Crack edge collocation for the direct computation of stress intensity factors using the displacement discontinuity method

Author: Napier, JAL Date: Sep 2002 The numerical solution of problems relating to crack fracture and failure can be accomplished using the displacement discontinuity boundary element method. This paper presents an extension to the normal formulation of this method to enable ... 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
Develop a quantitative understanding of rockmass behaviour near excavations in deep mines, part 1

Author: Napier, JAL ; Hildyard, MW ; Kuijpers, JS ; Daehnke, A ; Sellers, EF ; Malan, F ; Siebrits, E ; Ozbay, MU ; Dede, T ; Turner, PA Date: Dec 1995 Control of the rock mass deformation near deep level stopes and the avoidance of damaging incidents of violent rock failure require a fundamental understanding of rock failure mechanisms. Research work to gain this understanding has been ... Read more
Develop a quantitative understanding of rockmass behaviour near excavations in deep mines, part 2

Author: Napier, JAL ; Hildyard, MW ; Kuijpers, JS ; Daehnke, A ; Sellers, EF ; Malan, F ; Siebrits, E ; Ozbay, MU ; Dede, T ; Turner, PA Date: Dec 1995 Modelling of failure processes in rock is an essential adjustment to the analysis of observations of underground rock fracturing. The identification of mechanisms of deformation represents a basic step in understanding of rock mass behaviour ... Read more
Experimental and numerical study of the Kaiser effect in cyclic Brazilian tests with disk rotation

Author: Lavrov, A ; Vervoort, A ; Wevers, M ; Napier, JAL Date: Apr 2002 Sensitivity of the Kaiser effect to the deviations of the directions of sigma(1)-principal stress experienced by rock in Successive loading cycles has an important impact on the application of this effect for stress measurements in rocks. The ... 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
Fundamental aspects of the integration of seismic monitoring with numerical modelling.

Author: Mendecki, AJ ; Napier, JAL ; Ilchev, A ; Sellers, E Date: Jun 2001 Numerical modelling of rock-mass response to underground excavations is of vital importance for the decision-making process in designing and running a mine. Likewise, seismic monitoring with state-of-the-art local seismic systems is indispensable ... Read more
Implementation of a flaw model to the fracturing around a vertical shaft

Author: Van de Steen, B ; Vervoort, A ; Napier, JAL ; Durrheim, RJ Date: Apr 2003 This paper investigates whether a micromechanical model developed to investigate the relation between the basic failure processes at grain-scale and the macroscopic failure pattern can be applied to model the fracturing around large-scale ... Read more
Numerical modelling of fracture initiation and propagation in biaxial tests on rock samples

Author: Van de Steen, B ; Vervoort, A ; Napier, JAL Date: Mar 2001 A two-dimensional boundary element code, based on the displacement discontinuity method is used to simulate a confined compression test. The method takes account of the granular nature of the rock and of the presence of pre-existing defects. ... 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
Stress intensity factor analysis of friction sliding at discontinuity interfaces and junctions

Author: Phan, AV ; Napier, JAL ; Gray, LJ ; Kaplan, T Date: Dec 2003 A stress intensity factor (SIF) analysis for two dimensional fractures with frictional contact (crack friction) is presented. This analysis is carried out using the symmetric-Galerkin boundary element method, and a modified quarter-point crack ... Read more
Symmetric-Galerkin BEM simulation of fracture with frictional contact

Author: Phan, AV ; Napier, JAL ; Gray, LJ ; Kaplan, T Date: 14 Jun 2003 A symmetric-Galerkin boundary element framework for fracture analysis with frictional contact (crack friction) on the crack surfaces is presented. The algorithm employs a continuous interpolation on the crack surface (utilizing quadratic ... Read more
Two-dimensional linear variation displacement discontinuity method for three-layered elastic media

Author: Shou, KJ ; Napier, JAL Date: Sep 1999 A new displacement discontinuity method is developed for the analysis of multi-layered elastic media. This approach is based on a novel superposition scheme and the analytical solution to the problem of a displacement discontinuity element ... 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

Now showing items 1-19 of 19

Browse

All of ResearchSpace

Quick Links

Legislation and compliance

General Enquiries

Tel: + 27 12 841 2911
Email: callcentre@csir.co.za

Physical Address
Meiring Naudé Road
Brummeria
Pretoria
South Africa

Postal Address
PO Box 395
Pretoria 0001
South Africa

Social Connect

Copyright © CSIR 2017. All Rights Reserved

Resources on this site are free to download and reuse according to associated licensing provision. Please read the terms and conditions of usage of each resource.