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Rudarsko-geološko-naftni zbornik, Vol. 38 No. 2, 2023.

Original scientific paper

https://doi.org/10.17794/rgn.2023.2.4

THE EFFECTS OF WATER CONTENT AND GRAIN SIZE ON THE CLOGGING AND ABRASIVITY OF FINE-GRAINED SOILS IN MECHANIZED EXCAVATION

Erfan Khoshzaher ; Department of Mining Engineering, Sahand University of Technology, Tabriz, Iran
Hamid Chakeri orcid id orcid.org/0000-0002-5734-5347 ; Department of Mining Engineering, Sahand University of Technology, Tabriz, Iran
Mohammad Darbor orcid id orcid.org/0000-0001-7854-9077 ; Department of Mining Engineering, Sahand University of Technology, Tabriz, Iran
Hadi Shakeri ; Department of Mining Engineering, Sahand University of Technology, Tabriz, Iran

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Abstract

Clogging during excavation is one of the common problems in mechanized excavation. Among the influential factors in clogging of the cutter head, we can mention the percentage of fine soil particles (under 200 mesh sieve), soil moisture, and soil type. In this study, to investigate the mechanism of tunnel excavation in the laboratory, a tunnel excavation machine laboratory simulator was designed and built. The features of this device are its horizontal operation, the low rotation speed of the cutter head, continuous contact of the pins with fresh soil during the test, and the continuous injection of additives with a specific injection pressure during the test. The effect of the percentage of fine-grained, soil moisture and the foam injection ratio (FIR) on clogging, energy consumed, and the average wear of cutting tools was studied. The results showed that with an increase in the percentage of fine soil particles from 90 to 100%, the clogging of cutting tools increased by 50%. Also, with an increase of soil moisture from a dry state to moisture content of 5%, clogging of the cutter head is insignificant, and after that, with an increase of moisture from 10 to 25%, clogging is increased by 178%, and the amount of energy consumed in each test is increased by 84%. In addition, by increasing the foam injection ratio from 40 to 60%, clogging decreased by 81% on average, and the wear of cutting tools decreased by 62% on average.

Keywords

Mechanized excavation; wear of cutting tools; clogging; clay; foam

Hrčak ID:

303969

URI

https://hrcak.srce.hr/303969

Publication date:

10.6.2023.

Article data in other languages: croatian

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