A new approach is introduced for study of the behaviour of geotechnical strength parameter prior to slope analysis to ascertain whether strength parameters of slope materials are homogenous or heterogeneous at different mine depths. The strength parameters used for the study are uniaxial compressive strength, tensile strength and shear strength. The analysis is based on statistical analysis of variance technique for one-way classification. The application of the technique is given through a case study in an openpit mine.
Eine neue Annaherung wird fuer Studie des Verhaltens des geotechnischen Starke Parameters vor Steigunganalyse eingefuehrt, um zu ermitteln, ob Starke Parameter der Steigungmaterialien homogenous oder an den unterschiedlichen Grube Tiefen heterogen sind. Die Starke Parameter, die fuer die Studie verwendet werden, sind einachsige zusammenpressende Starke, Dehnfestigkeit und Scherstarke. Die Analyse basiert auf statistischem varianzanalytische Technik fuer Einwegklassifikation. Die Anwendung der Technik wird durch eine Fallstudie in einer openpit Grube gegeben.
Une nouvelle approche est presentee pour l'etude du comportement du paramètre geotechnique de force avant l'analyse de pente pour etablir si les paramètres de force des materiaux de pente sont homogenous ou heterogènes à differentes profondeurs de mine. Les paramètres de force utilises pour l'etude sont resistance à la pression uniaxiale, resistance à la traction et resistance au cisaillement. L'analyse est basee sur statistique la technique de l'analyse de variance pour la classification à sens unique. L'application de la technique est donnee par une etude de cas dans une mine à ciel ouvert.
The geotechnical strength parameters significantly influence the stability analysis of surface mining, tailing dams, spoil piles etc. and study of their behaviour is very important. If the strength parameters of slope materials are homogenous, analysis of the slope stability is simple by the well-known limit equilibrium method. However, in case of complex rock conditions, average values of strength parameters may not give reliable results if this method was used. In such cases it is necessary to make use of other approaches, such as probabilistic (Nishimatsu and Okubo 1983) and fuzzy set theory (Fernando 1987), for slope analysis. Thus, before slope analysis can proceed it is important to study the variability of the geotechnical strength parameters of the slope materials in different parts of the pit. The slope angle in different sections of the pit will depend on the variation in the strength properties of the slope material (Hawley and Stewart 1986; Hustrulid et al 2000; Bye and Bell 2001).
In this paper a study of whether strength parameters of slope materials vary with increase in depth is carried out, i.e., whether the parameters are homogenous or heterogeneous. The strength parameters used for the study are uniaxial compressive strength, tensile strength and shear strength.
The whole analysis is based on statistical analysis of variance technique for one-way classification (Box et al 1978). In this technique, three or more samples are considered simultaneously in order to test the hypothesis that all the samples are drawn from the same population, i.e., that they all have the same mean.
