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Publication year - 1976
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.1976.tb02475.x
Subject(s) - face (sociological concept) , head (geology) , geology , mining engineering , engineering , forensic engineering , paleontology , sociology , social science
A mini‐sized tunnel boring machine was used in Quincy, Illinois to drive a sewage overflow tunnel through 8000 ft. of limestone and chert. The device employs a rotating cutter head that swings up from the floor of the tunnel, undercutting, and fracturing rock from the working face.