CORRELATION BETWEEN SEISMIC WAVE VELOCITY, ROCK POROSITY, AND MAXIMUM PRINCIPAL STRESS BASED ON THE LABORATORY TEST DATA

摘要

In order to determine the internal relationships among seismic wave velocity, axial pressure, and rock porosity, the rock samples taken from NRS170143 borehole of the Nickel Rim South mine are tested using a Hoek type triaxial cell equipped with axial linear variable differential transducers (LVDTs) and a data acquisition module. The empirical expression between seismic wave velocity and rock pressure is fitted based on the laboratory test data of rock samples. Then, P-V model P- model and (p-s model are createdto analyze the laboratory test data. The results show that: (1) the relationship between axial pressure and rock porosity can be represented by a new empirical equation (p=a*e~b*p-c. With an increase of axial pressure, the value of rock porosity gradually decreases below the straight line q>=l% and close to 0.