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Humidity Effects on Coal Mine Roof Stability.

Authors
Aughenbaugh-NB; Bruzewski-RF
Source
NTIS: PB/276-484 Available for Reference At Bureau Libraries :164 pages
Link
NIOSHTIC No.
10000918
Abstract
This report summarizes the results of an investigation into the causes of coal mine roof instability caused by the environmental characteristics of the air ventilated through a mine. The field studies concentrated on collecting data of surface weather conditions, mine air characteristics, roof material types, roof movements, and characteristics of roof deterioration. There are seasonal moisture interchanges between the mine rock and air, and that a mine will lose more water than it gains on a yearly basis. When the roof rock is shaley, seasonal changes in the humidity will cause roof deterioration because of the detrimental action of moisture on the shale. Neither temperature nor barometric pressure have a direct influence on shale durability. The rate and depth of moisture absorption into a shale is controlled strongly by bedding planes, fractures, and holes interrupting the exposed surface. It is evident that changes in the air humidity levels can cause certain shales to expand and generate swelling pressure that are sufficient to fail coal mine roofs.
Publication Date
19760101
Document Type
CP; Final Contract Report;
Fiscal Year
1976
NTIS Accession No.
PB-276484
NTIS Price
A09
Identifying No.
OFR 5-78
NIOSH Division
PRC;
Source Name
NTIS: PB/276-484 Available for Reference At Bureau Libraries
State
MO;
Performing Organization
University of Missouri-Rolla
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