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Evaluation of clogging and wear of tools in loose rock based on model tests
Publikationstyp
Journal Article
Date Issued
2019-06
Sprache
German
Author(s)
Institut
TORE-URI
Journal
Volume
42
Issue
2
Start Page
59
End Page
75
Citation
Geotechnik 2 (42): 59-75 (2019-06)
Publisher DOI
Scopus ID
Evaluation of clogging and wear of tools in loose rock based on model tests. The occurrence of clogging of the cutting wheel and in the mixing chamber as well as the wear of cutting tools still represent a problem in mechanized tunneling with earth pressure balanced shield drives (EPB) and hydroshield drives. Despite different procedures for prognosis based on the plasticity and consistency indices, still massive delays of tunnel excavation occur due to clogging because interruptions are needed for cleaning of the cutting wheel and the mixing chamber. Besides the clogging problems, also abrasiveness of the subsoil frequently represents a problem, because strongly abrasive soil leads to the frequent need for changing the cutting tools. A correct assessment of clogging potential as well as of abrasiveness, especially in loose rock and mixed soils still represents a difficult task for the employer and his ideally all-embracing request for bids as well as for the contractor who has to consider the clogging potential and abrasiveness as exactly as possible in his offer. In this contribution, a new cutting wheel model test is presented, which is, in contrast to existing methods, supposed to consider the interaction of human influence, machine and subsoil in a harmonic way for the prognosis of clogging problems and problems of cutting tool wear in mechanized tunneling.