Evaluation of in-situ cemented backfill performance. Rept. of Investigations/1991

Technical Report · Tue Jan 01 00:00:00 EST 1991

OSTI ID:5249176

Tesarik, D R; Vickery, J D; Seymour, J B

As part of its research program to investigate ways of improving resource recovery and reducing subsidence, researchers from the U.S. Bureau of Mines placed instruments in the B-North ore body of the Cannon Mine, Wenatchee, WA, to monitor cemented backfill and rock deformation during mining. The vibrating-wire guages proved to be reliable and versatile, and approximately half of the instruments are providing data after 2 years of use. A two-dimensional, finite-element model was used to analyze the Cannon Mine's multilevel bench cut-and-fill mining method and predict rock and backfill displacements. The model accurately predicted rock displacements, but the predicted and measured displacements in cemented backfill had a correlation coefficient near zero, indicating that the model should only be used to predict rock displacements and not backfill displacements. A finite-difference model was also used to evaluate the stability of a cemented backfill pillar. Results can be used to conservatively predict backfill stresses, but on-site observations of pillar failures coupled with in situ measurements are needed to make more accurate predictions. An ongoing evaluation of the mining system has indicated that filling the primary stopes tight to the back with cemented backfill allowed these pillars to carry overburden loads soon after the cemented backfill was placed.

• Research Organization: Bureau of Mines, Spokane, WA (United States). Spokane Research Center
• OSTI ID: 5249176
• Report Number(s): PB-91-230334/XAB; BUMINES-RI-9360
• Resource Relation: Other Information: Library of Congress catalog card no. 90-23307
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
BACKFILLING
PERFORMANCE TESTING
GROUND SUBSIDENCE
CONTROL
UNDERGROUND MINING
CEMENTS
COAL MINING
DEFORMATION
EXTENSOMETERS
FIELD TESTS
FINITE DIFFERENCE METHOD
FINITE ELEMENT METHOD
FORECASTING
GEOLOGIC STRATA
IN-SITU PROCESSING
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MINING ENGINEERING
MONITORING
OVERBURDEN
STABILITY
STATIC LOADS
STRATA MOVEMENT
STRESS ANALYSIS
SUPPORTS
TWO-DIMENSIONAL CALCULATIONS
BUILDING MATERIALS
ENGINEERING
GEOLOGIC STRUCTURES
ITERATIVE METHODS
MATERIALS
MECHANICAL STRUCTURES
MINING
NUMERICAL SOLUTION
PROCESSING
TESTING
012031* - Coal
Lignite
& Peat- Underground Mining- Strata Mechanics & Control- (1987-)