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A Support-performance Predicton Method for Hydraulic Backfill.

Authors
Pariseau-WG; Hill-JRM; McDonald-MM; McNay-LM
Source
NTIS: PB 265 930 :19 pages
Link
NIOSHTIC No.
10007790
Abstract
Elastic-plastic finite-element simulation of cut-and-fill stoping in deep, narrow veins shows substantial quantitative agreement with field measurements of stope closure and fill pressure made at two mines in the Coeur d'Alene Mining District of northern Idaho. The simulation procedure, validated by field data, was used in an analytical study of vein-wall closure and sill-pillar stress as influenced by full modulus, rock modulus, and premining stress. Ratios of closure and pillar stress in the filled stopes to closure and pillar stress in the unfilled stopes are used as prediction indices for fill performance. In general, the support capability of fill increases dramatically as the ratio of fill modulus to rock modulus approaches 1. A significant reduction in closure from the open stope--up to 75 percent--occurs with a relatively low-quality 10-ksi-modulus fill (rock modulus of 1,000 ksi). However, a higher quality fill is needed to achieve a substantial reduction in pillar stress from that of the open stope. A 100-ksi-modulus fill reduces pillar stress in both the 36-foot and 16-foot pillars (vein width is 10 feet) by about 50 percent relative to the open stope.
Publication Date
19760101
Document Type
IH; Report of Investigation;
Fiscal Year
1976
NTIS Accession No.
PB-265930
NTIS Price
A03
Identifying No.
RI 8161
NIOSH Division
SRC;
Source Name
NTIS: PB 265 930
State
ID;
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