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This numerical result corroborates the observed displacements in the underground structures and the surface subsidence. In particular, the displacement developed at the surface above the Rotunda reaches a maximum of 3 mm. The results of the numerical analysis on the central supporting Rotunda show that some surface subsidence was induced during excavation of the catacombs.
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Where 2D analysis fails to model properly the column behaviour, we use 3D modeling to evaluate the stress state in the supporting rock pillars of the excavated Rotunda, taking into account their 3D arrangement.
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In the analysis it is considered as an un-jointed homogeneous medium with low strength. The rock mass in general is normally widely jointed (> 1 m). The required input for the analysis (strength and deformability of the rock materials) was derived from laboratory tests and empirical assessments. The model was based on a 3D realistic simulation of the problem geometry. Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης, Πολυτεχνική Σχολή, Τμήμα Πολιτικών ΜηχανικώνĪ three-dimensional numerical model has been proposed of the central Rotunda of the catacombs of Kom El-Shoqafa with its six supporting rock pillars, excavated in sandy oolitic limestone deposit. Hemeda S., Bakasis Ilias (School of Civil Engineering, Aristotle University of Thessaloniki, Greece), Pitilakis Kyriazis (School of Civil Engineering, Aristotle University of Thessaloniki, Greece) The research provides theoretical references for similar slope projects.Conference Proceedings Articles / Conference / International Journal / Peer reviewed / Proceedings publishedĪ Three Dimensional (3D) Static Stability (FE) Analysis of the Central Rotunda of Catacombs of Kom El-Shoqafa, Alexandria, Egypt, Using the FLAC3D Through the method of combining numerical simulation and theoretical calculation,the potential danger degree of each position of the slope before and after excavation is comprehensively simulated and analyzed. Based on arranging monitoring points,the change curve of stress,strain,and horizontal & vertical sliding displacement at different positions on the sliding surface under a certain safety factor is detected and drawn. Based on the Coulomb Moore criterion,the limit equilibrium state of the slope and the position of the potential slip surface are determined. Combining with the finite element strength reduction method,the changes of the stress field,strain field,and shaping zone in the slope under a certain safety factor are analyzed. The development trend of plastic failure before and after excavation,the change law of slope stability coefficient,the changes of horizontal displacement and vertical settlement are compared and analyzed. Keyword: numerical simulation stability coefficient displacement change unbalanced force Coulomb Moore criterion Ībstract: Based on the importance of urban slope stability,combined with the geological conditions of slope related to the actual stratum combination,a model is extablished using FLAC3 D numerical simulation software. Author(s): SUN Haijun, LIU Nian, College of Resources and Environment, Henan University of Technology