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Test procedures for nonlinearly elastic stress-relief overcores.

Authors
Aggson-JR
Source
NTIS: PB 272 915, 1977; :1-9
Link
NIOSHTIC No.
10000882
Abstract
The theoretical relationships that are used to calculate in situ rock stress magnitudes and directions from borehole deformation data obtained during overcoring are based on the assumption that the rock is a linearly elastic material. Strictly speaking, this assumption is not valid in any rock. Thus, investigators using overcoring techniques must either accept various degrees of nonlinearity and the associated inaccuracies or use core testing techniques that address the problem and compensate for elastic nonlinearity. Previously developed test procedures for stress-relief overcores partially correct for nonlinearity. This Bureau of Mines paper describes a test procedure that completely corrects for elastic nonlinearity in stress-relief overcores.
Keywords
Mining-industry; In-situ-mining; Rock-mechanics; Elastic-properties
Publication Date
19770101
Document Type
IH; Report of Investigations
Fiscal Year
1977
NTIS Accession No.
PB-272915
NTIS Price
A02
Identifying No.
RI 8251
NIOSH Division
DRC
Source Name
NTIS: PB 272 915
State
CO
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