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Technique of Measuring Initial Deformation Around an Opening. Analysis of Two Raise-bore Tests.

Authors
Waddell-GG; Crocker-TJ; Skinner-EH
Source
NTIS: PB 200 044 :60 pages
Link
NIOSHTIC No.
10000994
Abstract
This report describes a method of measuring and analyzing the initial deformation which occurs in the medium surrounding a mine accessway as the opening is created. Discussed are (1) the hypothesis upon which the research is based; (2) the in situ rock- deformation measuring equipment developed; (3) the field tests, consisting of measuring the deformation of the medium around two 4- foot-diameter raise bores as the boring progressed; and (4) a finite- element technique to correlate theoretical with experimental results, using elastic theory. Described also are the raise-bore operation and performance. The instrumentation developed proved to have the sensitivity and resolution necessary to measure rock deformation around a full-scale raise bore during excavation. Tests show the relationships of rock deformation to progress of the raise boring and to time. The initial deformation of the opening appeared to be elastic. Using the deformation records and an estimated field stress, the modulus of elasticity was determined for the rock mass.
Publication Date
19710101
Document Type
IH; Report of Investigations
Fiscal Year
1971
NTIS Accession No.
PB-200044
NTIS Price
A05
Identifying No.
RI 7505
NIOSH Division
SRC;
Source Name
NTIS: PB 200 044
State
MA;
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