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Improvements in the three-component borehole deformation gage and overcoring techniques.

Authors
Hooker-VE; Aggson-JR; Bickel-DL; Duvall-WI
Source
NTIS: PB 234 137, 1974; :1-29
Link
NIOSHTIC No.
10000895
Abstract
This Bureau of Mines report summarizes the results of modifications in the borehole deformation gage design and subsequent changes in the overcoring techniques. Modifications in the borehole deformation gage have greatly improved the creep characteristics and enhanced the versatility of the gage. In situ field tests in competent rock near St. Cloud, Minnesota, provided sufficient data to compare the reliability between gages and new techniques in obtaining good engineering estimates of stresses. Near-surface horizontal stresses at the test sites are compressive and biaxial in nature.
Keywords
Mining-industry; Equipment-design; In-situ-mining; Equipment-reliability
Publication Date
19740101
Document Type
IH; Report of Investigations
Fiscal Year
1974
NTIS Accession No.
PB-234137
NTIS Price
A03
Identifying No.
RI 7894
NIOSH Division
DRC
Source Name
NTIS: PB 234 137
State
MN; CO
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