Publication details
Posouzení stability skalních stěn v údolí řeky Želetavky v okrese Třebíč na Vysočině
| Title in English | Rock slopes stability analysis in the valley of the Želetavka river |
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| Year of publication | 2022 |
| Type | Conference abstract |
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| Description | The field research was conducted in April of 2021 and is aimed at assessing the stability of selected rock faces and possibly designing a remediation solution. The rock walls are located near the river Želetavka in třebíč district. The Suche skaly sites, the wall at Kostiky and the wall at Svoboda´s mill were selected. All of these sites are composed of the double prowling granulite of the Gföl group moldanubic zone (Mísař et al., 1983). The evaluation consisted of the treatment of rock wall orientations and significant crack systems and a series of rock strength measurements were made using schmidt's hammer. This oriented data was evaluated using the Bieniawsky´s Rock Mass Rating System (RMR); Bieniawski, 1989) and its superstructures Roman's slope mass rating system (SMR; Romana, 1993), which uses a total of four parameters. Based on these classifications, it was assessed that the rock face on Suche skaly has a very good rock quality.According to the SMR classification, the second category corresponds to a partially stable rock face. A similar situation was found at the wall at Kostik, where the quality of the rock massif is good and SMR here came out largely in 2nd and 3rd category as partially stable to stable. These two sites are in favourable condition and it is not necessary to propose any complex remediation measures. On the contrary, the situation at The Free Mill, where it is a rock mass with a very good quality of rock, has been assessed unfavourably. However, the discontinuity systems were so unfavourable that, together with the sheer slope of the wall, which is almost vertical, there was a decrease in the value of SMR up to Category 5 with the rating of the rock face as completely unstable. Here it was proposed to remove the most unstable blocks of rock and possibly subsequent hardening by steel anchors due to the use of the wall as mountaineering. |