Determination of the stress state in a rock mass subjected to excavation

  • M. I. Álvarez-Fernández
  • C. González-Nicieza
  • A. Argüelles
  • A. E. Álvarez-Vigil
Original Paper

Abstract

This paper develops a model that allows the variation in the stress state in an area of ground to be determined, especially in the rock mass, as a consequence of human activity. It does so through the basis of measurements carried out at three boreholes that are neither co-linear nor co-planar and which are oriented towards the area in which the stress state is to be determined. More specifically, the method uses the data obtained from the measurement of the variations in diameter in each of the boreholes as a result of the alteration of the stress state of the rock mass, and calculates the deformation in three directions, perpendicular to one another. An elastic behaviour is assumed to obtain the state of stress. Finally, the paper reports a practical application of the method in an underground coal mine in Asturias (Spain), where it was possible to measure the stress states of the rock walls of the mined seam.

Keywords

Stress–strain Stress state Rock mass Coal mining Asturias 

Résumé

L’article présente un modèle donnant l’évolution de l’état de contrainte dans un volume de terrain défini, particulièrement en massif rocheux, en conséquence d’activités humaines. Ce résultat est obtenu sur la base de mesures réalisées au niveau de trois forages, ni co-linéaires ni co-planaires, orientés vers la zone d’étude. Plus précisément, la méthode utilise les données obtenues à partir de mesures des variations de diamètre de chaque forage résultant de la modification d’état de contrainte du massif, et calcule la déformation dans trois directions perpendiculaires ente elles. Un comportement élastique du terrain est supposé pour obtenir l’état de contrainte. Finalement, une application pratique de la méthode est présentée, réalisée dans une mine de charbon souterraine des Asturies (Espagne), où il a été possible de mesurer des états de contraintes dans les épontes de la couche exploitée.

Mots clés

Contrainte-déformation Etat de contrainte Massif rocheux Mine de charbon Asturies 

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • M. I. Álvarez-Fernández
    • 1
  • C. González-Nicieza
    • 1
  • A. Argüelles
    • 2
  • A. E. Álvarez-Vigil
    • 3
  1. 1.Department of Mining Engineering, Mining Engineering SchoolUniversity of OviedoAsturiasSpain
  2. 2.Department of Construction and Manufacturing Engineering, Polytechnic School of EngineeringUniversity of OviedoGijónSpain
  3. 3.Department of Mathematics, Mining Engineering SchoolUniversity of OviedoAsturiasSpain

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