... such features appear below buildings or roads it can produce catastrophic collapse. The changes of rock properties near the earth surface can be determined by geophysical measurements due to changes of electrical conductivity of rock, changes their seismic velocities and seismic attenuation, changes rock...

... Wellbore Design Reservoir Characterization baaren Upstream Oil & Gas rock property cement receiver visser configuration amplitude reservoir rock Biot theory porous rock frequency range artificial rock sample borehole simulator reservoir geomechanics acoustic measurement...

... and to determine rock properties. In a competent rock, the chances of recovery of intact core are relatively high, so rock properties can be determined in a biaxial compression test. In a closely jointed rock, however, the chances of recovery of intact core are much less. Even if overcoring has been successful...

... on their contour. Rock strenght increased, with the dis- tance from the contour being in- creased. To choose the type of support and to solve some other problems it is impotant to know changes of rock properties in time their stability. In this connection we investigated the changes of rock properties in mine...