PSI - Issue 48

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 48 (2023) 81–87

© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IRAS 2023 organizers Abstract After digging a mining structure in a rock mass, a redistribution of stresses occurs around this mining structure. During this redistribution, the rocks tend towards a new equilibrium state and undergo certain deformations, which can become dangerous during the mine exploitation, or even turn into a major accident. Therefore, the study of stability in fractured rock masses, as well as the modelling of mining structures, requires a detailed description of the behavioural models and their mechanical properties. These mechanical properties are influenced by scale effects, or even depend on the volume considered. The objective of this article is to study the influence of the effect of the shape and the load applied in order to approve the evaluation of the characteristic values of the mechanical properties of the excavated rock masses. Even to pinpoint the probability of a rupture in a perspective sizing of works and management of risks associated with the exploitation of mining resources (mines, quarries, drilling, etc.). The evaluation of the characteristic resistance of a pillar will be the main object of our research work. As a case study, we have taken the case of the Chaabet El Hamra underground mine in the city of Setif, Algeria. © 2023 The Authors. Published by ELSEVIER B.V. This is an open-access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer review under the responsibility of the IRAS 2023 organizers Keywords: Stability, Excavation, Probability of failure, Rock mass, Shape effect and mine Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2023) The loading and slenderness ratio effect on the failure probability of pillars in an underground mine: case study Youcef Cheikhaoui a, *, Djamel Nettour a , Hamza Cheniti a , Salim Bensehamdi a , Rachid Chaib b a L3M- National Higher School of Mines and Metallurgy Amar Laskri, Annaba 23000, Algeria b Transport Engineering and Environment Laboratory-University of Constantine 1, Constantine 25000, Algeria Abstract After digging a mining structure in a rock mass, a redistribution of stresses occurs around this mining structure. During this redistribution, the rocks tend towards a new equilibrium state and undergo certain deformations, which can become dangerous during the mine exploitation, or even turn into a major accident. Therefore, the study of stability in fractured rock masses, as well as the modelling of mining structures, requires a detailed description of the behavioural models and their mechanical properties. These mechanical properties are influenced by scale effects, or even depend on the volume considered. The objective of this article is to study the influence of the effect of the shape and the load applied in order to approve the evaluation of the characteristic values of the mechanical properties of the excavated rock masses. Even to pinpoint the probability of a rupture in a perspective sizing of works and management of risks associated with the exploitation of mining resources (mines, quarries, drilling, etc.). The evaluation of the characteristic resistance of a pillar will be the main object of our research work. As a case study, we have taken the case of the Chaabet El Hamra underground mine in the city of Setif, Algeria. © 2023 The Authors. Published by ELSEVIER B.V. This is an open-access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer review under the responsibility of the IRAS 2023 organizers Keywords: Stability, Excavation, Probability of failure, Rock mass, Shape effect and mine Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2023) The loading and slenderness ratio effect on the failure probability of pillars in an underground mine: case study Youcef Cheikhaoui a, *, Djamel Nettour a , Hamza Cheniti a , Salim Bensehamdi a , Rachid Chaib b a L3M- National Higher School of Mines and Metallurgy Amar Laskri, Annaba 23000, Algeria b Transport Engineering and Environment Laboratory-University of Constantine 1, Constantine 25000, Algeria

* Corresponding author. Tel.: /; fax: /. E-mail address: youcef.cheikhaoui@ensmm-annaba.dz 1. Introduction * Corresponding author. Tel.: /; fax: /. E-mail address: youcef.cheikhaoui@ensmm-annaba.dz 1. Introduction

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IRAS 2023 organizers 2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IRAS 2023 organizers The main cause of ground pressure is the force of gravity, as the rock layers above compress the lower layers by their weight, which in turn resist this pressure. Under normal conditions, these forces are in equilibrium but the rocks are under stress (Kumar et al., 2018; Yang et al., 2015). The main cause of ground pressure is the force of gravity, as the rock layers above compress the lower layers by their weight, which in turn resist this pressure. Under normal conditions, these forces are in equilibrium but the rocks are under stress (Kumar et al., 2018; Yang et al., 2015).

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IRAS 2023 organizers 10.1016/j.prostr.2023.07.113