Ultrasonic stess monitoring in underground mining

Gladwin M.T. (1982) Ultrasonic stess monitoring in underground mining. International Journal of Rock Mechanics and Mining Sciences and, 19 5: 221-228. doi:10.1016/0148-9062(82)90220-0


Author Gladwin M.T.
Title Ultrasonic stess monitoring in underground mining
Journal name International Journal of Rock Mechanics and Mining Sciences and
ISSN 0148-9062
Publication date 1982
Sub-type Article (original research)
DOI 10.1016/0148-9062(82)90220-0
Volume 19
Issue 5
Start page 221
End page 228
Total pages 8
Subject 1905 Visual Arts and Crafts
2200 Engineering
Abstract Stress changes induced in a large (40 × 40 × 120 m) underground support pillar by mining development have been monitored over a period of 2 yr in the 1100 copper orebody at Mt Isa Mine, Australia, using an ultrasonic stress monitoring device (USMD). Results are compared with estimates from in situ absolute stress measurements and with continuous strain recordings at a nearby site. Sensitivity to deviatoric stress changes of 0.01 MPa has been achieved. Propagation of stress relief cycles through the pillar were observed, and a number of creep events were documented. Many events of potential interest detechable in continuous strain measurements were examined in the stress domain. The large increases in vertical stress field expected as the pillar was progressively isolated did not occur since the pillar yielded by shear on pre-existing fractures. Most of the deformation of the pillar which was observed in strain records occurred without significant stress change demonstrating the need for simultaneous stress and strain data. Stress relief events propagate slowly through a rock mass on time scales of several days.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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