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Rock Stress Determinations from Overcoring: An Overview.

PB94108826

Publication Date	1993
Page Count	182
Abstract	The bulletin describes the U.S. Bureau of Mines three-component borehole deformation gage and the overcoring techniques used in rock stress determination. Thirty years of experience with the borehole gage has shown that it is an accurate instrument for measuring deformation of a borehole. The theoretical basis relating the deformation of a borehole to the in situ field stress is presented. Rock anisotropy, variation of topography on the stress field, and nonlinearity of the rock can be accounted for in calculating the in situ state of stress. A comparison of alternative methods for determining the absolute in situ field stress is also presented.
Keywords	Underground mining Rock mechanics Overburden Stress concentration Coring Computer applications
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 50D - Soil & Rock Mechanics
Corporate Authors	Bureau of Mines, Denver, CO. Denver Research Center.
Supplemental Notes	Library of Congress catalog card no. 92-26919.
Document Type	Technical Report
Title Note	Bulletin.
NTIS Issue Number	199402

Rock Stress Determinations from Overcoring: An Overview.

Rock Stress Determinations from Overcoring: An Overview.
PB94108826

Publication Date	1993
Page Count	182
Abstract	The bulletin describes the U.S. Bureau of Mines three-component borehole deformation gage and the overcoring techniques used in rock stress determination. Thirty years of experience with the borehole gage has shown that it is an accurate instrument for measuring deformation of a borehole. The theoretical basis relating the deformation of a borehole to the in situ field stress is presented. Rock anisotropy, variation of topography on the stress field, and nonlinearity of the rock can be accounted for in calculating the in situ state of stress. A comparison of alternative methods for determining the absolute in situ field stress is also presented.
Keywords	Underground mining Rock mechanics Overburden Stress concentration Coring Computer applications
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 50D - Soil & Rock Mechanics
Corporate Authors	Bureau of Mines, Denver, CO. Denver Research Center.
Supplemental Notes	Library of Congress catalog card no. 92-26919.
Document Type	Technical Report
Title Note	Bulletin.
NTIS Issue Number	199402