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Development of a Mechanical Roof Breaker for Ground Control in Longwall Operations Under Massive Roof.

Authors
Tandanand-S
Source
MISSING :20 pages
Link
NIOSHTIC No.
10001570
Abstract
Massive roof overlying the working seam in longwall operations can cause hazards if it does not cave readily behind the face supports. The overhang thus formed can overload the supports and endanger personnel when it collapses suddenly as a large rock mass. This Bureau of Mines report proposes the use of a concentrated load, either strip or point loading, applied onto the roof with the help of the upward thrust of the face supports. An experiment was conducted in the laboratory to obtain information about break characteristics and the values of significant parameters of three sedimentary rocks. The results were used to determine the breaking load requirements for a strong roof possibly encountered in typical longwall operations. The results show that the roof slab of moderate thickness can be fractured within the load capacity of off- the-shelf powered supports.
Publication Date
19800101
Document Type
IH; Report of Investigations
Fiscal Year
1980
NTIS Accession No.
NTIS Price
Identifying No.
RI 8416
NIOSH Division
TCRC;
Source Name
MISSING
State
MA;
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