Časoprostorové utváření poklesové kotliny v dobývacím prostoru Staříč.

Abstract

The goal of the dissertation is to deal with the connections between face extraction and ground subsidence in the specific conditions of the former Paskov Mine – Staříč working district. Differences between the measured subsidence values and theoretically calculated values have been reported in the long-term observed survey lines located in the Staříč working district. Particularly substantial differences are seen in the centres of subsidence throughs, where the real subsidence reaches third or half values of the estimated ones. On the other hand, the measured values show larger spatial extents of the subsidence throughs when compared to the theoretical values. Therefore, it may be assumed that the values of the basic parameters used to calculate the size of a subsidence though differ from the so far applied values in the conditions of the Ostrava-Karviná Coal Basin, which is an assumption examined and evaluated in this dissertation. The dissertation describes a subsidence through in the margin of a mining area using several survey lines and examines the extent of mining influence on the ground surface, defined by the limit angle and the subsidence factor. The most likely limit angle values for the Carboniferous and the Tertiary surface rocks in the study area of Staříč working district were determined. The best calculation results were obtained using the limit angle value of K= 75° for the Carboniferous, and P= 28° for the surface rock. In case of subsidence factor, it was a=0.85 in easy-to-cave roof 080, and a= 0.4 – 0.6 in difficult to cave roof 050.