Abstract
Intensive underground exploitation took place in the area of the Ostrava corporate town in recent past. After the coal mining was shut down in 1994 gradual subsidence in the town area has slowed down, however, establishing of the Digital Technical Map of Ostrava (DTMMO) dates back to 1992. When working a seam the original geostatic and tectonic stress state in the surrounding rock mass changes, which is accompanied by rock transformation and displacement from the roof towards the stope. Undermining is manifested in landscape morphology in many different ways that we can divide to continuous and discontinuous deformations. Residual mining effects could therefore have impacted positional accuracy of DTMMO in the last 18 years. The Bohumín 8-9/43 topographic sheet was selected for testing purposes in the Přívoz cadastral district. Santrauka Netolimoje praeityje Ostravos, miesto Čekijos rytuose, savivaldybėje buvo intensyviai eksploatuojama žemė. Nustojus užsiiminėti angliakasyba, nuo 1994-ųjų, palaipsnis žemės smukimas miesto vietovėse sulėtėjo. Skaitmeninis techninis Ostravos žemėlapis (DTMMO) sukurtas dar 1992 metais. Vykstant darbams žemės tarpsluoksnyje pirminis geostatinis ir tektoninis slėgis aplinkinėje uolienų masėje keitėsi, ir tai lėmė uolienų transformaciją ir slinktį. Kraštovaizdžio morfologijoje žala pasireiškia įvairiais būdais. Skiriama nenutrūkstamoji ir nutrūkstamoji deformacijos. Liekamasis kasybos poveikis per pstaruosius 18 metų galėjo paveikti pozicinį DTMMO tikslumą. Tiriant Přívoz kadastrinį rajoną, pasirinkta Bohumín 8-9/43 topografinio žemėlapio lapas. Резюме В недавнем прошлом в районе корпоративного г. Острава интенсивно эксплуатировались нижние слои грунта. После прекращения добычи угля в 1994 г. постепенное оседание поверхности города замедлилось. Созданная цифровая техническая карта г. Остравы (DTMMO) восходит к 1992 г. При работе с пластом возникающее исходное геостатическое и тектоническое возбуждение приводит к изменениям в окружающих пласт горных массивах, которые сопровождаются преобразованием пород и перемещениями в направлении забоя. Разрушение проявляется в морфологии ландшафта в самых разных формах, которые можно подразделить на непрерывные и разрывные деформации. Поэтому остаточные явления горных разработок могут оказывать влияние на позиционную точность DTMMO за последние 18 лет. Для анализа была выбрана топографическая плита Богумин 8-9/43 в кадастровом районе Привоз.
Highlights
Works on establishing the Ostrava Town Information System commenced in 1992 and due to the fact that significant part of the area is situated in undermined locations, effort was exerted to remove the undermining effects from the outset
The subsidence disrupted the essential field of points, which was why a polygonal traverse with long courses was led by the VŠB – Technical University of Ostrava in 1992 and 1993 through the town area with connection to triangulation points situated outside the undermined area in the Poruba municipal district and in northern part of the Ostrava corporate town (Žváček 2010)
First phase of the in site surveying concentrated on independent definition of coordinates from standpoints using the method of global navigation satellite system (GNSS) from which identical topographic points of DTMMO were measured, intended for the topographic sheet positional accuracy testing
Summary
Works on establishing the Ostrava Town Information System commenced in 1992 and due to the fact that significant part of the area is situated in undermined locations, effort was exerted to remove the undermining effects from the outset. The subsidence disrupted the essential field of points, which was why a polygonal traverse with long courses was led by the VŠB – Technical University of Ostrava in 1992 and 1993 through the town area with connection to triangulation points situated outside the undermined area in the Poruba municipal district and in northern part of the Ostrava corporate town (Žváček 2010). Detail fields of points were used for detail surveying to establish the DTMMO. The map on the Bohumín 8-9/43 topographic sheet was originally terrestrially surveyed in 1992 from the new field of points starting from area that was not undermined, and this original state was provided for testing. Residual mining effects and positional errors of the DTMMO could have manifested within the last 18 years
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