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The Cutting Resistance of Rock Salt in Function of Temperature

Kotwica Krzysztof, Stopka Grzegorz

New Trends in Production Engineering

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2020

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Vol. 3, Iss. 1

211--220

EN

Currently over then 16 percent of the total worldwide salt production is excavated in underground mines. Salt deposits often lie at great depths up to 1000 m, where the temperature of the surrounding rocks reaches 50°C and even exceeds it. A large part of it is exploited using mechanical methods, mainly with the use of road headers and continuous miners. When excavating salt rock, the cutters of the road header mining head come into contact with the rock. This generate friction and in consequence a rise in temperature. In AGH University of Science and Technology the laboratory tests were carried out to determine the effect of temperature on cutting resistance and selected mechanical properties of rock salt. On the special laboratory test stand the rock salt sample was cutted at three different temperatures - 20, 50 and 80°C. The cuttability index and the side chipping angle were measured for each temperature. Additionally the same tests were performed in the case of salt sample after cooling to room temperature. The selected mechanical parameters of rock salt - compressive, tensile and shear strength were also measured for the same temperature values. The obtained results were compared and described in the paper.

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The effect of temperature on the mechanical properties and workability of rock salt

Małkowski Piotr, Bednarek Łukasz, Kotwica Krzysztof, Stopka Grzegorz

New Trends in Production Engineering

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2019

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Vol. 2, Iss. 1

384--393

EN

Underground salt mining accounts for about 16 percent of the total salt production worldwide. When excavating salt rock, the cutters of the road header come into contact with the rock. This produces friction and, consequently, a rise in temperature. Generally, as temperature increases, salt gradually loses its plasticity. The extent of these alterations depends on the presence of other minerals in the rock. This paper presents the results of laboratory tests on regularly shaped samples of salt. An analysis was performed of the results of compressive, tensile and induced-shear strength, and of Young's modulus, Poisson's ratio, cuttability index and side chipping angle. The testing was conducted on samples with a temperature of about 20°C and samples heated to 50°C and 80°C. The tests showed that as temperature increased, so did compressive and tensile strength, and longitudinal and transverse strain of salt. The temperature increase caused, however, a decrease in shear strength. The cuttability index and the side chipping angle also decreased when the heated samples were being cut. The percentage changes in the parameters within the 60-degree temperature range were as high as several dozen percent.

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Mechaniczne urabianie skał w warunkach górnictwa odkrywkowego. Cz. 1

Krauze K.

Surowce i Maszyny Budowlane

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2004

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nr 3

23-26

PL

Zastosowanie mechanicznego sposobu urabiania skał w warunkach górnictwa odkrywkowego wymaga spełnienia określonych warunków związanych z urabialnością minerału. Odpowiedzi: czy dany minerał można efektywnie urabiać mechanicznie, należy poszukiwać poprzez wyznaczenie wskaźnika skrawalności, co pozwoli określić wymagane parametry konstrukcyjne, kinetyczne i energetyczne maszyny urabiającej. Parametry te powinny być takie, by uzasadnione stało się (technicznie, ekonomicznie) stosowanie urabiania mechanicznego. Powyższe przesłanki legły u podstaw opracowania zespołu urabiającego wykorzystującego metodę frezowania, zainstalowanego na ciągniku gąsienicowym. Badania wstępne przeprowadzone w warunkach KWB Bełchatów ciągnika gąsienicowego z zespołem urabiającym, wykazały przydatność tego rozwiązania i określiły parametry kinematyczne i konstrukcyjne organu urabiającego.