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Mine Roof Reinforcement of Specifically Designed Epoxy Resin Systems.

Authors
Subramanian-RV; Austin-HF; Raff-RAV; Franklin-JC
Source
NTIS: PB 234 075 :14 pages
Link
NIOSHTIC No.
10000993
Abstract
This Bureau of Mines project investigated the use of polymers to achieve rock bonding and reinforce coal mine structures for better or permanent ground support. Support was achieved by pumping the polymers into the rock interstices to bond the mass together for increased structural competence. Holes were drilled in the mine roof, after which the polymers were injected at about 100 psi to permeate the cracks. Initial laboratory work indicated that, of all the resin systems tested, the epoxy resins could most likely be modified to be suitable for rock injection. This was confirmed when several potentially suitable resin systems underwent intensive evaluation. In a series of three field-tests, two conducted in a copper mine with coal mine-type shale and the third in a coal mine, it was shown that the polymers penetrated cracks less than 0.005 Inch wide. The fast-setting epoxy systems, cured out in thin films under mine conditions, produced a bond exceeding the strength of the uncracked virgin rock. Work done in cooperation with Washington State University.
Publication Date
19740101
Document Type
IH; Report of Investigations
Fiscal Year
1974
NTIS Accession No.
PB-234075
NTIS Price
A03
Identifying No.
RI 7907
NIOSH Division
SRC;
Source Name
NTIS: PB 234 075
State
WA;
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