Návrh a zhodnocení vlivu předpínatelných lanových kotev na stabilitu konstrukcí z hlediska časového vývoje

Abstract

The thesis is focused generally on anchoring of underground structures with particular focus on the so-called „high anchoring“ in Ostrava-Karviná coalfield fort strenghtening the steel arch support of mine workings. The work deals with anchoring theory, anchoring influ-ence on the construction, respectively rock mass and losses of prestressing in the anchors, inc-luding some practical experience with cable bolts behaviour in real conditions of coal mines. To achieve the following goals forces in the anchors and convergence of profiles of mine workings have been measured in several workings in the Ostrava-Karvina coalfield. Prestres-sing losses have been measured using a laboratory model. The aim of this work is not only the evaluation of the learned and processed experience from the cablebolts in mine workings and related coal face extraction, but also recommendati-ons for higher efficiency of high anchoring considering the conditions of application and re-duction of prestressing losses.