Transverse Anisotropy in Biot's Constant through Dynamic Measurements on Cordoba Cream Limestone

A laboratory testing procedure was developed to evaluate the dynamic transverse anisotropy in Biot's constant on Cordoba Cream limestone samples obtained from a quarry in Texas. Ultrasonic compressional and shear waves were transmitted in both axial and radial directions, and travel times were recorded simultaneously with load and deformation recordings. It was found that the variation in Biot's constant with stress is more significant in the horizontal direction than in the vertical direction. The results show that static values of the Biot's constant in the axial direction were found to be more than the corresponding dynamic values.