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Relationship Between Horizontal Stresses and Geologic Anomalies in Two Coal Mines in Southern Illinois.

Authors
Ingram-DK; Molinda-GM
Source
MISSING :18 pages
Link
NIOSHTIC No.
10006237
Abstract
In situ horizontal stresses were measured to determine the influences of geologic anomalies on the regional horizontal stress field in two coal mines in southern Illinois. Stress measurements were obtained near a normal fault having a 121-ft displacement at the Amax Wabash Mine and a large coalbed want at the Kerr-McGee Galatia No. 5 Mine. Horizontal stress measurements were completed using a Bureau of Mines borehole deformation gauge. The average maximum and minimum horizontal compressional stresses at the Wabash Mine were 1,400 and 800 psi, with the direction of maximum stress ranging from n 78 deg. W to n 83 deg. E. At the Galatia No. 5 Mine, the averages were 1,500 and 500 psi, with the direction of maximum stress ranging from n 85 deg. E to n 75 deg. E. Generally, the geologic anomalies appear to have no dramatic effect on the regional horizontal stresses. However, subtle differences between stress measurements suggest an influence by the fault zone at the Wabash Mine. The larger anisotropic stress conditions at the Galatia No. 5 Mine could be responsible for the increase in kink zones and directional roof failures.
Publication Date
19880101
Document Type
IH; Report of Investigations;
Fiscal Year
1988
NTIS Accession No.
NTIS Price
Identifying No.
RI 9189
NIOSH Division
PRC;
Source Name
MISSING
State
IL;
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