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Title: A practical tool for the stability estimation of underground quarries in North France
Authors: Rafeh, Faten 
Mroueh, Hussein
Hitti, Karim 
Burlon, Sébastien
Affiliations: Department of Civil Engineering and Construction 
Department of Mathematics 
Keywords: Numerical modelling
Factor of safety
Underground quarries
Parametric study
Resistance of pillar
Subjects: Regression analysis
Issue Date: 2019
Part of: World journal of engineering
Volume: 16
Issue: 5
Start page: 604
End page: 613
Purpose The presence of underground quarries in North France in close proximity to urbanized areas, imposes serious problems in terms of security of both people and constructions at one hand, and induces a strong constraint against planning and urban development on the other hand. The purpose of this paper is to provide a practical tool for the preliminary estimation of the stability of underground quarries. Design/methodology/approach In this paper, a numerical stability study of quarries, excavated in chalk of North France with or without joints, by the method of rooms and pillars, is presented. This integrates the data provided from site: mechanical properties of the chalk and geometric characteristics of the quarries (width of the pillar W, height of the pillar H and span between pillars L), as well as the orientation of the joints (α). Numerical parametric analysis is conducted using FLAC 3D. Factors of safety are computed from the numerical models. Then, a second-order regression technique is applied on these numerically obtained factors, to correlate new formulae. Findings As a result, user-friendly formulae for the calculation of factors of safety Fs (ex) are extrapolated. Besides, abacuses to determine the minimum permissible effective width of safe pillars are proposed. Originality/value By this, it becomes possible, knowing only few parameters about geometry and properties, to give a fast estimation of the stability state of any quarry in the region.
DOI: 10.1108/WJE-10-2018-0341
Ezproxy URL: Link to full text
Type: Journal Article
Appears in Collections:Department of Civil Engineering and Construction

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