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Uncertainty analysis of the stability parameters of rock walls

Mokhtar S., Yousefirad M.

Archives of Civil Engineering

2020

Vol. 66, nr 4

703--721

The purpose of this paper is to investigate the effects of natural uncertainties and effective parameters on the stability of plate-type rock walls. For this, the effective factors and geo-mechanical properties in the study area were obtained using field experiments. Stability analysis of rock walls was investigated for 40 scenarios in dry and saturated states. These parameters were then evaluated using Easyfit software and Markov chain analysis and Monte Carlo simulation by Rock Plane software. Comparison of the results of numerical and uncertainty methods shows that the rock walls with 60-80 degree slope are stable; and In saturated state they require stability due to the reduction of shear strength. Fixation of the rock walls was also investigated, indicating an optimum angle of 30° for the installation of the rock screw. The results show that the Monte Carlo simulation provides a simpler interpretation and the uncertainty methods are more accurate and reliable than the numerical methods.

Variation and diversity of spider assemblages along a thermal gradient in scree slopes and adjacent cliffs

Ruzicka V., Zacharda M.

Polish Journal of Ecology

2010

Vol. 58, nr 2

361-369

The thermal regime of a phonolite scree slope on Klic Mt., North Bohemia, Czech Republic, was monitored by miniature data loggers. The spiders were collected throughout the entire scree field area and on the adjacent cliff. In 2005 and 2006, the mean internal temperatures at the lower margins of the scree slope were 0.1 and 0.5[degrees]C, whereas the mean external ambient temperatures were 6.8 and 7.2[degrees]C, respectively. The difference, therefore, is 6.7[degrees]C. The long-term cooling of the basal portions, along with the winter heating of the central and upper parts of the scree, are the most specific microclimatic phenomena. The boreomontane species inhabit the extremely cold vents at the lower margins of the scree slope. Species of alpine origin inhabit the middle portions of the scree slope. Six thermophilous species inhabit the sun-exposed rock margins of Klic Mt., which is nearly at the uppermost limit of their vertical distribution in the Czech Republic.