DETERMINATION OF ROCK ELASTICITY PARAMETERS USING SONIC VIEWER MACHINE

• Main Author: Rahman Pasaribu, Abdul
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/72926
• Institution: Institut Teknologi Bandung

The elastic parameters of the rock can provide information on the strength of the rock against the load given to it. Information about rock parameters is needed in the construction of buildings, dams, bridges, reactors, and so on. Investigations into the properties of these rocks need to be carried out and developed in an effort to obtain rocks that suit the needs. One of the methods used to utilize the principle of elastic waves is to use a Sonic Viewer machine. This research was conducted to determine the value of ultrasonic wave velocity and rock elasticity parameters. The calculated elasticity parameters such as Poisson's ratio, Young's modulus, Shear's modulus, Bulk's modulus, Lame constant and porosity in rock samples. In the experiments carried out, the electrical waves were converted into mechanical waves and flowed through the rock samples. The propagation time of the rock samples obtained is displayed on the oscillator screen. This delay time is used to obtain the P wave velocity (Vp) and S wave velocity (Vs) of the sample. The speed of this wave is used to determine the elastic parameters. From the data obtained, the range of P wave velocity values is 833 m/s to 5000 m/s, then the range of S wave velocity values is 417 m/s to 3333 m/s. Poisson's ratio values range from 0.1 to 0.467. Young's modulus values range from 1.8×106 Pa to 1.9×108 Pa. Shear modulus values range from 6.9×105 Pa to 8.2×107 . Bulk modulus values range from 1.8×106 to 8.8×106 . The range of values for the Lame constant is 1.4×106 to 3.3×107 . The porosity values produced in this study ranged from 0.6% to 36.9%, with the smallest porosity values being produced by samples 9 and 10 and the largest by sample 5.