Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Instrument to Measure the Initial Deformation of Rock Around Underground Openings.

Authors
Beus-MJ; Phillips-EL; Waddell-GG
Source
NTIS: PB 279 657 :40 pages
Link
NIOSHTIC No.
10000789
Abstract
This Bureau of Mines report describes a tunnel stress relaxation gage (tsr) developed to measure initial radial displacement around full-sized underground openings. The tsr technique was shown to be a valid concept in previous field verification tests. Sensitivity has been improved by employing a titanium alloy cantilever in the transducer head, which also permits a deeper sensor location. Use of improved fabrication methods such as stainless steel bellows and sputtering techniques and use of an environmental chamber for testing greatly increased overall reliability. A miniature data acquisition system (das) was interfaced directly to the transducer for increased versatility and containment entirely within a borehole. The present tsr system is suitable for use around full- size underground excavations, particularly machine-bored openings. Field evaluation of the improved instrumentation verified the design goals.
Publication Date
19780101
Document Type
IH; Report of Investigations
Fiscal Year
1978
NTIS Accession No.
PB-279657
NTIS Price
A04
Identifying No.
RI 8275
NIOSH Division
SRC;
Source Name
NTIS: PB 279 657
TOP