ISSN:
1435-9537
Keywords:
Mots clefs Stabilité de talus
;
Mine
;
Lignite
;
Seisme
;
Turquie
;
Key words Slope stability
;
Mine
;
Lignite
;
Seism
;
Turkey
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
Description / Table of Contents:
Abstract A slope stability analysis of the Afsin-Elbistan lignite mine in Turkey was prepared taking into account the seismic environment of the mine. In a first paper, Kiliç, du Mouza and Arnould (1997) presented the general conditions of the pit – its geology, hydrogeology and soil mechanical properties – together with computations of safety coefficients using a static approach such as those developed by Bishop, Carter and Sarma. This paper presents a pseudostatic approach and compares it with that used by Kiliç and al (1997). This method of analysis was considered realistic as the mine is located in a seismic area. Having considered the seismic context, a regional seismic coefficient k was derived from the Bath method. This was then introduced into the safety coefficient computations, according to each model used. This coefficient, applied to the weight of the soil likely to move, provides a value of the elastic strength equivalent to the stresses in the dynamic state. As in the static approach, the results highlight the main influence of the hydrogeological and geometrical slope conditions, for each of which several assumptions were tested. Solution I corresponds to the slope geometry proposed during the mine planning stage which was adopted at the commencement of the exploitation. Three important landslides occurred resulting in a change in the slope geometry and leading to the choice of Solution II. Computations made during this work have shown that for this configuration the slopes could be unstable in a saturated state. For this reason Solution III was designed, reducing the slope angles. The variation in the safety coefficients between the static and pseudostatic approach is clearly evident. The difference between the slope geometry assumed in Solution II and that proposed to prevent any slope instability (Solution III) is some 20%. The latter proved to be the only geometry which could be considered stable whatever the hydrogeological conditions.
Notes:
Résumé Le but de ce travail a été d'effectuer une analyse de la stabilité des talus de la mine d'Afsin-Elbistan (Turquie) en prenant en compte le contexte sismique de la mine par une approche pseudo-statique qui a été développée en complément de l'étude statique présentée dans un article précédent. Cette analyse s'impose dans ce cas car la mine est située dans une région sismique. Les calculs des coefficients de sécurité ont été effectués en mode pseudo-statique en utilisant les méthodes de Bishop, de Carter et de Sarma. Comme dans l'approche statique, ces résultats montrent l'influence primordiale des conditions hydrogéologiques et de la géométrie choisie pour les talus de la fosse. Ils mettent aussi clairement en évidence la variation des coefficients de sécurité entre l'approche statique et pseudo-statique.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100640050055
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