Research Article

Study on Ultrasonic Characteristics and Prediction of Rock with Different Pore Sizes

Table 4

Attenuation coefficient before and after drilling of rock samples with different pore sizes at 100 kHz.

Rock sample numberAperture size (mm)Attenuation coefficient before drilling (dB/m)Attenuation coefficient after drilling (dB/m)Attenuation coefficient difference (dB/m)

A11021.722.91.1
A21522.123.81.7
A32021.724.22.5
A42521.924.82.9
A53022.025.83.8