No abstract

Knowledge of compressional and shear wave velocities is necessary to estimate the physical, dynamic and mechanical properties of rocks with an indirect, but easy, fast and economical way. Although, many attempts have been made to correlate the wave velocities with the rock characteristics, only few studies have been concentrated on ultrabasic rocks and especially on peridotites. The aim of this study is to apply correlation analysis to investigate the relationships between wave velocities and rock properties for peridotites. Thus, 35 fresh peridotite samples (non or slightly serpentinized ultrabasic rocks), taken from the western part of Othrys mt and the Kallidromo mt (central Greece) were tested. The relationships between P and S wave velocities and the rock properties are described by simple regression analyses and the confidence intervals are presented as well. The study reveals strong positive, linear correlations between the P and S wave velocities. Positive, linear relationships are also indicated between wave velocities and unit weight and mechanical properties, while the increase of effective porosity causes decrease of the wave velocities. The wave velocities are exponentially affected with serpentinization percentage, while the best fit equations between wave velocities and primary minerals are logarithmic. The wave velocities and the micropetrographic index I ps are strongly correlated by both exponential and linear functions, but exponential trends present higher determination coefficients.

No abstract

No abstract

Due to the fact that the estimation of the triaxial parameters is very important in any geotechnical project, many attempts have become with the aim of their determination. In spite of its relative simplicity, triaxial tests are time consuming, expensive, and require a large number of well prepared (regularly shaped) rock specimens and suitable testing procedures. For this reason, they cannot be easily determined in rocks which are thinly bedded, highly fractured, weak, and so indirect, fast, practical, easy and economical ways should be used such as the correlation of them with some other characteristics which are calculated easily. The aim of this study is to apply correlation analysis to investigate the relationships between physical, dynamic and mechanical characteristics and triaxial parameters for ultramafic rocks. Thus, sixteen samples, taken from the western part of Othrysmt (ten samples) and the Kallidromomt (six samples, central Greece), were tested and the relations among the properties were described by simple regression analyses. The study reveals strong negative, logarithmic correlations between the effective porosity and triaxial parameters (c, φ). Positive, linear relationships are also indicated between wave velocities, apparent cohesion and friction angle, while the increase of serpentinization percentage causes decrease of the c, φ. Both dry unit weight and Schmidt Hammer Values are logarithmically affected with c, φ. The point load strength index and apparent cohesion and friction angle are strongly correlated by both logarithmic and linear functions, but logarithmic trends present higher determination coefficients.