THE APPLICATION OF NON-DESTRUCTIVE METHODS TO ASSESS THE STABILITY OF THE NATIONAL NATURE MONUMENT OF THE PRAVČICKÁ BRÁNA ROCK ARCH, CZECH REPUBLIC

  • Zuzana Vařilová The Museum of the Town of Ústí nad Labem, Czech Republic
  • Jiří Zvelebil GEO-TOOLS, Zdiby-Přemyšlení, Czech Republic
  • František Hubatka KOLEJ CONSULT & servis, Brno, Czech Republic
  • Vojtěch Beneš G IMPULS Praha spol. s r. o., Praha, Czech Republic
  • Josef Frolka KOLEJ CONSULT & servis, Brno, Czech Republic
Keywords: cretaceous sandstones, rock arch, stability, geophysical methods, displacement monitoring

Abstract

The study contains the results of non-destructive research of the Pravčická Brána Rock Arch which focuses on the structure and natural dynamics of this rock formation and its current level of stability. The main results  include a description of the block fabric of the rock body and the nature of the contact zone between the arch beam and the southern pillar, discovery of relatively fresh secondary fissures and identification of zones with weakened strength within the sandstone massif. Also the local hydrodynamic regime was determined by a combination of geophysical methods. Long-term monitoring has demonstrated slow and irreversible body movements and reversible quasicyclical movements associated with changes in temperature on a scale of  days up to years. The collected information was used to develop a structural deformation model of the arch  body, including a description of the nature of the disintegration. The work was designed to fully respect the  protective conditions of the site, to facilitate future follow-up activities and to monitor any possible negative  changes in the rock massif.

Published
2014-05-19
How to Cite
Vařilová, Z., Zvelebil, J., Hubatka, F., Beneš, V., & Frolka, J. (2014). THE APPLICATION OF NON-DESTRUCTIVE METHODS TO ASSESS THE STABILITY OF THE NATIONAL NATURE MONUMENT OF THE PRAVČICKÁ BRÁNA ROCK ARCH, CZECH REPUBLIC. AUC Geographica, 49(1), 49-59. Retrieved from http://aucgeographica.cz/index.php/aucg/article/view/116
Section
Original Articles