Finite Element Analysis Model for Determination of In-situ and Mining Induced Stresses as a Function of Two Different Mining Methods Used at Diavik Diamond Mine

• Author / Creator

  Sepehri, Mohammadali

• One of the essential components of the underground excavation design process, which directly influences the performance and stability of underground constructions, is knowledge of the in-situ and mining-induced stress. Knowing the magnitudes and directions of these stresses can help determine suitable shapes and orientations for tunnels (drifts) and stopes. In addition, knowing the stress regime in the rock mass can be used to predict the type of rock failure that may occur in the future and identify potential rockbursting zones. The problem statement for this geomechanical research thesis is: “The determination of in-situ and mining-induced stress regimes as a function of two different underground mining methods used at Diavik Diamond Mine” In this research, the main objective is to develop an engineering methodology to estimate the in-situ and mining-induced stress regimes in the host rock and orebody using the finite element analysis method. A case study of Diavik Diamond Mine is used to illustrate the estimation procedure and to implement the proposed methodology. In order to reach the objectives of this research, a full realistic three dimensional finite element model of the case study mine was developed. This finite element analysis model was used to determine the in-situ and mining-induced stress regimes at the case study mine. Some laboratory tests have been conducted on Kimberlite samples to calibrate the material strength properties (such as elastic and strength parameters). Finally, the results from the developed finite element model are validated by comparing them to actual field data and site observations. The main contributions of this study include developing and implementing an engineering methodology for estimating in-situ and mining-induced stresses, providing a better understanding of the stress distribution regime in a mine and investigating the role of mining methods on mining-induced stress fields. The outcomes of this research will enhance the body of knowledge regarding the effect of stress ratio (the ratio between horizontal to vertical stress) and stress heterogeneity regimes on the stability of underground excavations and possible zones of failure.

• Subjects / Keywords

  • Underground Mining
  • Mining Induced Stress
  • Numerical modelling
  • Rockburst
  • Rock Mechanics
  • Mining Induced Subsidence
  • Stope Stability Assessment

• Graduation date

  Fall 2016

• Type of Item

  Thesis

• Degree

  Doctor of Philosophy

• DOI

  https://doi.org/10.7939/R39882Z2S

• License

  This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.