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A Sub-Level Caving Algorithm for Large-Scale, Small-Strain, Numerical Simulations

  • Bre-Anne Louise Sainsbury
Technical Note
  • 116 Downloads

Introduction

In block and panel caving, mobilization of the ore is achieved without drilling and blasting. The disintegration is brought about by natural processes that include the in situ fracturing of the rock mass, stress redistribution, the limited strength of the rock mass, and gravitational forces. Sub-level caving (SLC) requires the transformation of in situ ore into a mobile state by conventional drilling and blasting. This may be a result of a high rock mass strength or strategy to reduce dilution.

The SLC method is thought to have evolved as an up-scaling technique to the top slicing mining method (Peele 1918). Block caving, in turn, was the logical scale-up from sub-level caving. In the first application of sub-level caving, the ore was not drilled and blasted completely between two sub-levels, but only parts were broken by induced caving; hence the name sub-level caving (Janelid 1972). At current day SLC operations, the ore mass between the sub-levels is blasted. As a...

Keywords

Sub-level caving Numerical model 

List of Symbols

Vdraw

Scaled draw velocity based on scheduled tons

Vmax

Maximum draw velocity to ensure pseudo-static equilibrium

Vapp

Applied draw velocity (Vdraw × Vmax)

Notes

References

  1. Andrieux P, Hadjigeorgiou J (2008) The destressability index methodology for the assessment of the probability of success of a large-scale confined destress blast in an underground mine pillar. Int J Rock Mech Min Sci 45:407–421CrossRefGoogle Scholar
  2. Cundall P (1991) Shear band initiation and evolution in frictional materials. mechanics computing in 1990’s and beyond. In: Proceedings of the Conference, Columbus, Ohio, May 1991. Structural and Material Mechanics, 1991, vol. 2Google Scholar
  3. Janelid I (1972), Study of the gravity flow process in sub-level caving. In: International Sub-level Caving Symposium, Stockholm, SeptemberGoogle Scholar
  4. Peele R (1918) Mining engineers’ handbook. Wiley, New YorkGoogle Scholar
  5. Sainsbury B (2010) Sensitivities in the numerical assessment of cave propagation in Caving 2010. In: Second International Symposium on Block and Sub-level Caving. 20–22 April 2010, Australian Centre for GeomechanicsGoogle Scholar
  6. Sainsbury B (2018) Consideration of the volumetric changes that accompany rock mass failure. Rock Mech Rock Eng (in press)Google Scholar
  7. Sainsbury B, Stockel B-M (2012) Large-scale caving and subsidence assessment at the Kiirunavaara Lake Orebody. MassMin 2012, SudburyGoogle Scholar
  8. Sainsbury D, Lorig L, Sainsbury B (2010) Investigation of caving induced subsidence at the abandoned Grace Mine Caving 2010. In: Second International Symposium on Block and Sub-level Caving. 20–22 April 2010, Australian Centre for GeomechanicsGoogle Scholar

Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Science, Engineering and Built EnvironmentDeakin UniversityWaurn PondsAustralia

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