Estimation of static parameters based on dynamical and physical properties in limestone rocks

- The geomechanical properties of the Jahrum and Asmari formations from the Bazoft dam site were investigated.
- Relationships between UCS, Es with water absorption, Ed, Vp and Vs were established.
- The best correlation of UCS and Es was related to Vp and Ed, respectively.
- The Ed was 5 times larger than Es and dynamic Poisson's ratio was 1.3 times larger than static one.
- Relations of other researchers showed acceptable accuracy for the Jahrum and the Asmari limestones.

Due to the importance of uniaxial compressive strength (UCS), static Young's modulus (ES) and shear wave velocity, it is always worth to predict these parameters from empirical relations that suggested for other formations with same lithology. This paper studies the physical, mechanical and dynamical properties of limestone rocks using the results of laboratory tests which carried out on 60 the Jahrum and the Asmari formations core specimens. The core specimens were obtained from the Bazoft dam site, hydroelectric supply and double-curvature arch dam in Iran. The Dynamic Young's modulus (Ed) and dynamic Poisson ratio were calculated using the existing relations. Some empirical relations were presented to estimate uniaxial compressive strength, as well as static Young's modulus and shear wave velocity (Vs). Results showed the static parameters such as uniaxial compressive strength and static Young's modulus represented low correlation with water absorption. It is also found that the uniaxial compressive strength and static Young's modulus had high correlation with compressional wave velocity and dynamic Young's modulus, respectively. Dynamic Young's modulus was 5 times larger than static Young's modulus. Further, the dynamic Poisson ratio was 1.3 times larger than static Poisson ratio. The relationship between shear wave velocity (Vs) and compressional wave velocity (Vp) was power and positive with high correlation coefficient. Prediction of uniaxial compressive strength based on Vp was better than that based on Vs. Generally, both UCS and static Young's modulus (ES) had good correlation with Ed.