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Study of rock fracture under blast loading

Baranowski Paweł, Kucewicz Michał, Pytlik Mateusz, Małachowski Jerzy

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2022

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Vol. 70, nr 5

art. no. e141723

EN

A study of dolomite rock material failure using a simple small-scale blast setup is presented. Laboratory tests were conducted using disc specimens drilled with a borehole in the center. A detonation cord and a blasting cap were fitted inside the borehole to induce cracking and fracturing of the specimens. The specimens were inserted between two steel plates, which were compressed against the specimen using bolt screws. Prior to testing, the most suitable screw torque for constraining the vertical displacement of the specimen surfaces without compressing the specimen was selected based on numerical simulations. Then, the experimental tests with the blasting cap were simulated using the Johnson–Holmquist II (JH-2) material model, and the properties of the blasting cap were determined and verified in two special tests with a lead specimen. Possessing the validated model, the influence of specimen thickness on the cracking patterns was finally analyzed. This paper presents a relatively easy method for studying rock material behavior under blast loading and for validating the numerical and constitutive models used for rock simulations.

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Wczesnopiastowskie problemy z wykorzystaniem surowców skalnych

Skoczylas J.

Przegląd Geologiczny

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2017

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Vol. 65, nr 7

432--436

EN

The article presents and characterizes stone building material of the monumental buildings from the beginning of the early Polish state during the reign of the Piast dynasty. It was found that the stone architecture was built of boulders, predominantly quartzites, gneisses and granites. Boulders accounted for 98% of all stone building material. The acquisition of the building material was carried out mainly through the collecting on the surface. The deforestation works that are believed to have been carried out mostly to gain landfor agriculture and stock raising facilitated the process of building early monumental buildings in Poland. In the article, the author hypothesizes that burning and grubbing of forest land could be made not only for those reasons, but also for the need ofconstruction works.

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Geological monuments of the nature and their conservation policy in Belarus

Yelovicheva Y. K., Vinokurov V., Drozd Y.

Polish Geological Institute Special Papers

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2004

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Vol. 13

163-165

EN

The brief characteristics of geological, landscape and botanical monuments of the Belarus nature is given. Their protection is carried out within the framework of realisation of the National strategy and Plan of actions on preservation and sustainable use of a biological variety of the Republic of Belarus.

PL

Podana jest krótka charakterystyka geologicznych, krajobrazowych i botanicznych pomników przyrody białoruskiej. Ich ochrona jest prowadzona w ramach narodowej strategii i planu działania w zakresie ochrony i zrównoważonego wykorzystania biologicznej różnorodności Republiki Białoruskiej.