Long term behavior of a chalk : effect of relative humidity and flooding - Ineris - Institut national de l'environnement industriel et des risques Access content directly
Conference Papers Year : 2019

Long term behavior of a chalk : effect of relative humidity and flooding

Abstract

The shallow underground room-and-pillar mines where chalk rocks were extract-ed are now abandoned and are enduring the effects of time and weathering which increase their risk of collapse. The Parisian Basin in France contains many abandoned underground chalk mines and number of them were already instrumented or subjected to a feedback analysis aimed to aid the development of prevention strategies. Campaigns of laboratory characterization are often conducted to complete the understanding of the hydromechanical behavior of these chalks. For instance, laboratory characterization was conducted to understand the long-term behavior, among other, of Saint-Martin-le-Noeud chalk with respect to the relative humidity for levels ranging between 90% and 100%, the most representative of the in situ conditions of abandoned underground openings. The main conclusions are: (a) the existence of stress and relative hu-midity thresholds from which the creep of this chalk starts, (b) the flooding at the last levels of stress and hygrometry leads to an accelerated creep causing the ruin of samples without transient phase.

Domains

Earth Sciences
Fichier principal
Vignette du fichier
2019-198_post-print.pdf (692.73 Ko) Télécharger le fichier
Origin Files produced by the author(s)

Dates and versions

ineris-03237768 , version 1 (26-05-2021)

Identifiers

  • HAL Id : ineris-03237768 , version 1

Cite

Mountaka Souley, Christophe Auvray, Noémie Lafrance, Jean-Marc Watelet, Vincent Renaud. Long term behavior of a chalk : effect of relative humidity and flooding. 14th International congress of rock mechanics (ISRM 2019), Sep 2019, Foz do Iguassu, Brazil. ⟨ineris-03237768⟩
48 View
37 Download

Share

Gmail Mastodon Facebook X LinkedIn More