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In situ determination of stresses in mountainous topography.
Hooker-VE; Bickel-DL; Aggson-JR
NTIS: PB 211 928, 1972; :1-19
Stress relief measurements were made at three underground test sites associated with the Henderson Project, American Metal Climax, located in the rugged, mountainous region between Loveland Pass and Berthoud Pass on the continental divide in Colorado. Sufficient data were obtained to determine the three-dimensional stress ellipsoid for each site. The measurements were made at hole depths greater than one diameter of the mined opening; thus, calculated stresses are representative of premining in situ conditions. The vertical components of stress are in good agreement with overburden depth including the influence of mountain topography. Horizontal components of stress substantially increase with depth. These components are believed to be influenced by stresses presumably of tectonic origin. The largest measured principal stress was 5,900 psi at a depth of 3,708 feet. The predominant orientation of maximum principal stress for the determinations at greatest depth is in the nw-se quadrants. The work upon which this report is based was done under a cooperative agreement between the Bureau of Mines, U.S. Department of the Interior, and American Metal Climax, Inc., Henderson Project.
Mining-industry; Measurement-equipment; In-situ-mining; Underground-mining; Geology; Rock-mechanics
IH; Report of Investigations
NTIS Accession No.
NTIS: PB 211 928
Page last reviewed: May 5, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division