PEAT EXCAVATION BY GRAPPLE FORK

This work focuses on the description of an economic system of the low-decayed peat raw materials selective excavation applied in the production of filtering material. The method of natural peat excavation provides progressive restoration of production area as influenced only rather small area of a peat bog in certain time. The method of peat raw materials excavation consists in use by means of the grapple fork with loading in the tractor semitrailer for transportation.
Peat deposits have a low density and low strength, are easily deformable system the loading that occurs conditionally, instant, slow highly elastic deformation, and flow deformation. The development of each of them depends mainly on the strength of the structure of peat, consisting of plant residues, forming the interlacement structures, and coagulation structures of disintegration products.
When the shift fork jaws of the grapple in the material under the action of horizontal compressive forces arise stress and deformation. The model allows to take into account the highly elastic component of the low-decayed peat is the three-element of the Zener rheological model of a linear viscoelastic body. Obtained on the basis of the Zener model linear viscoelastic body the expressions for the calculation of the conditionally instantaneous modulus of elasticity, modulus of delayed elasticity and viscosity allow a fairly accurate calculation of the mechanical characteristics in the field of highly elastic sample. These results are in good agreement with the experimental data of the research.
Compression process at peat raw materials excavation from a peat deposit must be exercised when external stress (power influence from the grapple fork) that exceeds the yield strength of the peat raw materials. The value of the external stress has to choose with regard to overcoming shear stress of the top layer of peat deposit, which guarantees a filling volume of grapple fork with a compaction factor of 1.3.

Keywords

Peat raw material, selective excavation, grapple fork, Zener model, stress, compression deformation, modulus of elasticity, viscosity.

Issue number: 2
Year: 2016
ISBN:
UDK: 622.331: 622.271
DOI:
Authors: Mikhaylov A. V., Taranov A. G.

About authors: Mikhaylov A.V., Doctor of Technical Sciences, Professor, e-mail: epc68@mail.ru, Taranov A.G., Graduate Student, e-mail: taran007@list.ru, National Mineral Resource University «University of Mines», 199106, Saint-Petersburg, Russia.

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