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Antoni Tajduś, Marek Cała and Krzysztof Tajduś

1969. [6] L ane K.S., H eck W.J., Triaxal testing for strength of rock joints , Proc. 6 th Symp. Rock Mech. Rolla, 1964, 98–108. [7] F lisiak J., T ajduś A., C ała M., F lisiak D., Geomechaniczne zjawiska wywołane eksploatacją w górotworze zaburzonym tektonicznie , ( Geomechanical phenomena due to mining excavation in tectonically engaged rock mass ), Scientific project No. 9T12A01112, (in Polish, unpublished). [8] T ajduś A., F lisiak J., C ała M., Wpływ pierwotnego stanu naprężenia w górotworze na zagrożenia tąpaniami , ( Interaction

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Tadeusz Majcherczyk and Zbigniew Niedbalski


The paper presents an analysis of seismic activity for selected areas of hard coal mine executing exploitation in a rock mass with a variable degree of rock disturbance, i.e., also with a varied number of previous mined-out seams. A distribution of vertical stress and a value of vertical stress concentration coefficient were also determined in the strata of immediate roof of the seams planned for mining. In the analyzed case, despite the lack of thick and solid strata of sandstones in the roof, the rock mass emits seismic activity, where the energy largely depends upon an impact of exploitation edges and tectonic disturbance.