You need JavaScript to view this

Stress measurements in the Naesliden Mine

Abstract

Determinations of virgin stresses were performed at an early stage of the Naesliden Project in order to obtain input data for the finite element models of the mine. The Leeman three-dimensional overcoring technique was used at five locations on levels ranging from 210 m to 460 m below surface. Stress data were obtained at four of these locations. The results show an excess of horizontal stresses whilst the vertical stress is in accordance with the gravitational load from the overburden. The major and intermediate principal stresses are sub-horizontal and directed respectively perpendicular and parallel to the schisotsity of the wall rock and the strike of the tabular ore body. The minor principal stress is directed almost vertically. Stresses were also measured close to a stope on 300 m level in the mine. Biaxial and triaxial overcoring measurements were made at eighteen points between 0.25 m and 7.2 m above the roof of the stope. The stresses were found to have magnitudes of about 70 MPa close to the roof and to decrease rapidly with the distance from the roof. Stress measurements were made in connection with slot blastings in the foot wall, the latter measure being made in an attempt  More>>
Authors:
Leijon, B.; [1]  Carlsson, H.; Myrvang, A.
  1. Univ. of Luleaa, Sweden
Publication Date:
May 15, 1980
Product Type:
Conference
Report Number:
CONF-8006140-(Vol.2)
Reference Number:
EDB-81-011680
Resource Relation:
Conference: Conference on application of rock mechanics to cut-and-fill mining, Luleaa, Sweden, 1-3 Jun 1980; Related Information: In: Application of rock mechanics to cut-and-fill mining. Volume 2
Subject:
42 ENGINEERING; 58 GEOSCIENCES; UNDERGROUND MINING; STRESS ANALYSIS; BACKFILLING; MEASURING METHODS; ROCK MECHANICS; STRESSES; SWEDEN; EUROPE; MECHANICS; MINING; SCANDINAVIA; WESTERN EUROPE; 422000* - Engineering- Mining & Underground Engineering- (1980-); 580300 - Mineralogy, Petrology, & Rock Mechanics- (-1989)
OSTI ID:
8489397
Country of Origin:
Sweden
Language:
English
Submitting Site:
SWED
Size:
Pages: 72-90
Announcement Date:
Jan 01, 1981

Citation Formats

Leijon, B., Carlsson, H., and Myrvang, A. Stress measurements in the Naesliden Mine. Sweden: N. p., 1980. Web.
Leijon, B., Carlsson, H., & Myrvang, A. Stress measurements in the Naesliden Mine. Sweden.
Leijon, B., Carlsson, H., and Myrvang, A. 1980. "Stress measurements in the Naesliden Mine." Sweden.
@misc{etde_8489397,
title = {Stress measurements in the Naesliden Mine}
author = {Leijon, B., Carlsson, H., and Myrvang, A.}
abstractNote = {Determinations of virgin stresses were performed at an early stage of the Naesliden Project in order to obtain input data for the finite element models of the mine. The Leeman three-dimensional overcoring technique was used at five locations on levels ranging from 210 m to 460 m below surface. Stress data were obtained at four of these locations. The results show an excess of horizontal stresses whilst the vertical stress is in accordance with the gravitational load from the overburden. The major and intermediate principal stresses are sub-horizontal and directed respectively perpendicular and parallel to the schisotsity of the wall rock and the strike of the tabular ore body. The minor principal stress is directed almost vertically. Stresses were also measured close to a stope on 300 m level in the mine. Biaxial and triaxial overcoring measurements were made at eighteen points between 0.25 m and 7.2 m above the roof of the stope. The stresses were found to have magnitudes of about 70 MPa close to the roof and to decrease rapidly with the distance from the roof. Stress measurements were made in connection with slot blastings in the foot wall, the latter measure being made in an attempt to de-stress the roof of stope 3. Two methods were used for stress monitorings, both showing that expected stress changes did not take place. Long-term stress guages have been installed in the ore body in order to monitor expected re-distributions of stresses due to mining. So far, the recorded stress changes are below 5 MPa.}
place = {Sweden}
year = {1980}
month = {May}
}