@ARTICLE{Pękala_A._Wpływ_2015, author={Pękala, A.}, number={No 4}, journal={Archives of Civil Engineering}, pages={47-58}, howpublished={online}, year={2015}, publisher={WARSAW UNIVERSITY OF TECHNOLOGY FACULTY OF CIVIL ENGINEERING and COMMITTEE FOR CIVIL ENGINEERING POLISH ACADEMY OF SCIENCES}, abstract={The transitional siliceous rocks from the Belchatow lignite deposit belong to the deposits with heterogeneous petrographic composition. The research allows us to identify among others, opoka-rocks and gaizes. The mineralogical-chemical analysis proves that the main ingredients of the studied rocks commonly used as building material are minerals of the SiO₂ group. Laboratory tests show that the nature of siliceous mineral phases has several effects on the geomechanical parameters of the studied transitional rocks. They are a reduction in water content and rock porosity, which leads to the transition of opal type A to opal type crystobalit and trydymit and then to quartz or microquartz. Their density and strength parameters are increased.}, type={Artykuły / Articles}, title={Wpływ krzemionkowych faz mineralnych na własności geomechaniczne skał przejściowych ze złoża węgla brunatnego „Bełchatów”}, title={The influence of siliceous mineral phases on the mechanical properties of transitional rocks in the Belchatow lignite deposit}, URL={http://journals.pan.pl/Content/84048/mainfile.pdf}, keywords={skały przejściowe, minerały z grupy SiO₂, złoże węgla brunatnego Bełchatów, parametry geomechaniczne, transitional rocks, mineral SiO₂, Belchatow lignite deposit, geomechanical properties}, }