Potential landslide hazard in a zone of stabilised earthen embankments illustrated by Wysoka Gorka in Chełm

• Autorzy: Demczuk P. , Zydron T. , Dobrowolski R. , Dzieńkowski T. , Słuch M.
• Języki publikacji: EN

Abstrakty

EN

Plant cover is an important element in the management of earthen structures and slopes improving their aesthetic values and limiting their vulnerability to denudation processes. With regard to landslide hazards, an important aspect in the presence of plants is the effect of their root systems on the shear strength of the substrate and, consequently, on slope stability. The aim of the study was to determine the impact of the tree cover at the Wysoka Górka archaeological site on the stability of the earthen embankment on Góra Katedralna in Chełm (Lublin Province). These architectural elements originate from the times of Chełm’s glory in the first half of the 13th century, when it became the capital of Halych-Volhynia Duchy and a residence of Prince Danylo Romanovych (Isaiecić 1999). The research involved identification of the geological structure of the embankment (surveying, measurement of the filtration coefficient) and laboratory determination of the geotechnical parameters of the soil (particle size distribution and soil compressive strength measured in a triaxial compression apparatus). In the next stage of the study, stability was calculated with limit equilibrium methods in the GeoStudio program. Standard calculations of the embankment stability were performed and the stability coefficient for the slope devoid of vegetation and the tree-covered slope were compared assuming zero suction pressure. The shear strength parameters of soil reinforced by plant roots were adopted following the recommendations specified by Hubble et al. (2013). The authors performed a probabilistic analysis in order to determine the probability of critical values of the safety factor (<1.0) and comparative stability calculations, taking into account hydrological effects for the tree-covered and tree-devoid (after felling the trees) embankments (Sonnenberg et al. 2010, Simon and Collison 2002). The results of the stability calculations demonstrated that the presence of viable plant roots in the substrate increased slope stability, and the presence of tree stands at the bottom of the embankment appeared to be more favourable. Modelling the slope stability with consideration of the effect of atmospheric factors has shown that the presence of woody vegetation contributed to increased water infiltration into the embankment, resulting in reduction of suction pressure. In turn, tree felling led to reduction in suction pressure due to inhibition of evapotranspiration.

• Wydawca: -
• Czasopismo: Polish Journal of Soil Science
• Rocznik: 2018
• Tom: 51
• Numer: 1
• Opis fizyczny: p.71-81,fig.,ref.

Twórcy

autor

Demczuk P.

• Faculty of Earth Sciences and Spatial Management, Maria Curie-Sklodowska University in Lublin, A.l. Krasnicka 2cd, 20-718 Lublin, Poland

autor

Zydron T.

• Department of Hydraulic Engineering and Geotechnics, University of Agriculture in Krakow, Al. Mickiewicza 24/28, 30-059 Krakow, Poland

autor

Dobrowolski R.

• Faculty of Earth Sciences and Spatial Management, Maria Curie-Sklodowska University in Lublin, A.l. Krasnicka 2cd, 20-718 Lublin, Poland

autor

Dzieńkowski T.

• Institute of Archaeology, Faculty of Humanities, Maria Curie-Sklodowska University in Lublin, pl. Marii Curie-Sklodowskiej 4a, 20-031 Lublin, Poland.

autor

Słuch M.

• Faculty of Earth Sciences and Spatial Management, Maria Curie-Sklodowska University in Lublin, A.l. Krasnicka 2cd, 20-718 Lublin, Poland

Bibliografia

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Identyfikatory

DOI

10.17951/pjss/2018.51.1.71