Hynek Lahuta

Relevance of building site categories implementation into the land use plan in underground mining area in the region of Petrvald (Czech Republic)

Deep mining of mineral resources causes extensive changes in rock environment and ground morphology and must be considered in the land use planning. Subsidence as a result of underground mining activities in terrains is one of the serious geological hazards because they can effect slopes and damage engineering structures, settlement areas, natural lakes and allow infiltration of contaminant into the groundwater. The main aim of this article was implementation of the building site categories of underground mining regions into the land use plans. This case study area was selected from the region of Orlova town within the Ostrava-Karvina Coal district, and this region is one of the most affected areas by underground mining of black coal in the Czech Republic. Certain risk categories of land, where the individual categories express generalized influence of deep mining of coal in current and planned constructions were also represented in this article. Extensive variations caused by underground mining were identified within a wide variability of risk categories. An important finding was also the extensive variability over time, manifested by spatial variations in the stated categories in the studied time periods. Moreover, technical documentation of environmental impacts related to underground mining activities was provided; importance of existing and proposed underground mining projects that may significantly impact the land use was discussed and pointed out in this article, especially.

Assessment of Fiber Reinforced Concrete Slab and Subsoil Interaction - Experiment

The paper is focused on the interaction of the fibre reinforced concrete slab and the subsoil using both the results of experimental measurements on the experimental stand. Performed experimental measurements include monitoring of the concentrically loaded concrete slab with the dimensions of 2 m x 2 m and thickness of 0.15 m. This slab is in the interaction with subsoil of sandy clay character. The experimental load is applied in sequential steps by using a hydraulic press. During the tests the strain gauges and hydrostatic levelling method were used for the monitoring of the settlements of the slab. The contact stresses and the stresses corresponding to a certain depth below the slab were monitored by using a flat pressure cells. In the conclusion of this paper there are formulated the basic aspects of concrete slab-subsoil interaction, the results of various performed experimental measurements and the comparison of stress below the surface resulted from interaction of soil and slab of different degree of reinforcement.