A Simple Tool to Measure Stress in Mine Backfill

Robertson, A. MacG.
Organization: International Conference on Ground Control in Mining
Pages: 9
Publication Date: Jan 1, 1986
A cone penetrometer has been used to assess the level of stress existing in hydraulically placed mine backill. The test apparatus was fabricated at the mine and consisted of a steel cone, connector rods and a hydraulic jack. Testing was carried out from a manway passing through the centre of the stope. The cone was pushed horizontally into the fill, both at right angles and parallel to the orientation of the stope walls, and the resistance to penetration was measured. Corrections were made to allow for friction along the rods. In a cohesionless sand, such as mine fill, the point resistance should be directly related to the in situ stress. The stresses in mine backfill are due to o the self weight of the fill o convergence of the footwall and hangingwall of the stope. Silo theory was used to estimate that component of the in situ stress due to the self weight of the fill. The difference between the stress predicted by silo theory and the stress estimated from the cone resistance was assumed to be due to convergence of the stope walls.
Full Article Download:
(1556 kb)


Additional chapters/articles from the SME-ICGCM book Proceeding of the Fifth Conference on Ground Control in Mining (ICGCM)

Expanded Cement: New Solutions for Age-Old Problems
Determination of Effective Column Lengths for Resin-Grouted
How to Design an Efficient Roof Bolting Plan Based on Simple
Donut Cribbing--A Hew Heavy-Duty Roof Support Concept
Development of A Yielding Steel Post
Design Procedure for Arch Canopies for Rehabilitation of Hig
Investigation of Some Alternatives to Timber Posts and Cribs
Design and Field Testing of a Mobile Roof Support for Retrea
Change in Primary Roof Support System at Quarto Mining Compa
Remote Mining Using Water for Ground Support
New Type of Load Cell for Monitoring of Roof Bolt Tension
Field Measurements of Chain Pillar Response to Longwall Abut
Integrated Instrumentation Method of Stress State, Material
A Study of Roof Caving in the Eastern U.S. Coalfields
A Simple Tool to Measure Stress in Mine Backfill
Optimization of the Stress Control Method to Improve Product
Effect of High Horizontal Stress on Coal Mine Entry Intersec
Analysis of Small-Scale Thrust Faults and Their Effect on Co
A Case History of Computer-Aided Lineament Analysis for Grou
Designing for Upper Seam Stability in Multiple Seam Mining
Behavioral Aspects of Roof/Rib Injuries--Implications for Tr
Engineering Classification of Shales
Empirical Approach to Calculate Rock Loads in Coal Mine Road
Assessment of the Rockburst Proneness in Hard Rock Coal Mine
Outburst Control in Underground Coal Mines,
The Effect of Immediate Strata on Pillar Behavior in Retreat
Roof Control Problems on Development and Longwall Gateroads
A Case Study of Longwall Roof-Supports Interaction
Tailgate Support Evaluation at Plateau Mining Company
Methods of Controlling Hard Roof in a Longwall Face