Estimation procedure of multiple passability of hauling unit on weak ground

Peat cutting involves multiple passes of hauling units on weak ground. The hauling unit passability on weak ground is analyzed in the condition of peat extraction pits. The ultimate strengths of peat ground are determined as [] =13.9 kPa and [q] =146 kPa in the assessment of peat haulage on weak ground. The procedure is developed for selecting semi-trail wheel travel tires. For some tire sizes, the relations of the mean maximum pressure (MMP) of the semi-trailer and the main tire parameters are obtained from mathematical modeling. Using the cone index, the connection of haulage vehicles with maximum strengths of peat ground is determined for multiple passes (VCI50) for each tire size. The structure of a hauling unit is validated to be composed of a power-driven traction device represented by double-wheeled tractor BELARUS-1221.4 and a tandem-axle semi-trailer 1585 kg in weight to transport load of 4000 kg, and the efficient set of radial flotation tires 600/50R22.5 is substantiated for a double-wheeled semi-trailer. Physical simulation determined the draft behavior of the doublewheel model of the tandem-axle semi-trailer. It is found that draft has a hysteresis of 75–85% after double pass and stabilizes after the 7th loading cycle, and the contact area of wheels with the compacted wheel track surface grows, which increases multiple passability. The research results can be used in design of hauling units toward their multiple passability on weak ground in any territory development.

Mikhailov А. V., Kazakov Yu. A. Estimation procedure of multiple passability of hauling unit on weak ground. MIAB. Mining Inf. Anal. Bull. 2022;(8):95-110. [In Russ]. DOI: 10.25018/0236_1493_2022_8_0_95.

A.V. Mikhailov¹, Dr. Sci. (Eng.), Professor, e-mail: Mikhaylov_AV@pers.spmi.ru, ORCID ID: 0000-0002-0516-7737,
Yu.A. Kazakov¹, Graduate Student, e-mail: s185048@stud.spmi.ru, ORCID ID: 0000-0002-7040-5412,
¹ Saint-Petersburg Mining University, 199106, Saint-Petersburg, Russia.

Yu.A. Kazakov, e-mail: s185048@stud.spmi.ru.

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