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Rapid Excavation in Hard Rock: A State-of-the Art Report.

Authors
Bruce-WE; Morrell-RJ
Source
Proc Deep Tunnels in Hard Rock-a Solution to Comb Sewer Problems EPA PP 187-219 :187-219
Link
NIOSHTIC No.
10010364
Abstract
This paper describes the evolution of present day tunnel-boring techniques. Emphasis is directed toward selected cases from the past decade which are discussed in some detail. The data presented has, in many cases, been generated by Bureau of Mines personnel during on-site studies of the particular job. Wherever feasible, samples of the rocks being bored were returned to the Twin Cities Mining Research Center for determination of the physical properties. This paper presents the significant problems and accomplishments for various actual operations. Wherever possible, it presents physical characteristics of the rock encountered to aid the reader in evaluating rock hardness.
Publication Date
19700101
Document Type
OP;
Fiscal Year
1970
NTIS Accession No.
NTIS Price
Identifying No.
OP 66-72
NIOSH Division
TCRC;
Source Name
Proc., Deep Tunnels in Hard Rock-a Solution to Comb. Sewer ... Problems. EPA, PP. 187-219
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