... wall. The distribution of the elastic wave velocity in rock can easily be measured along a borehole drilled for rockbolts. INTRODUCTION Stability analysis of underground structures focuses on the tunnel linings, the loosened zone and the surrounding non-damaged rock. For an analysis aimed...

... ABSTRACT: The continuous surface wave system (CSWS) is a non-intrusive geophysical technique used for evaluating subsurface shear wave velocity profiles. It makes use of Rayleigh (surface) waves that propagate within a zone approximately one wavelength in depth. In ground where the stiffness...

... publishing house amplitude soil layer stratum construction ground surface wave velocity underground work hydrogeological factor Bucharest deposit river UNDERGROUND WORK IN BUCHAREST GEOTECHNICAL AND HYDROGEOLOGICAL FACTORS Eng. George Rozorea11, Dr. Eng. Virgil Fierbinteanu2, Eng. Viorica...

... be rendered from the tomographic reconstruction of boundary measurements. Finally, the increasing importance and future developments in this area are discussed. frequency shear wave velocity characteristic Engineering laboratory Reservoir Characterization wavelength receiver Upstream Oil...

... to create the cracks in planes parallel to the sample axis. Compressional - and two shear-wave velocities, having particle motion parallel and perpendicular to sets of cracks, were determined concurrently with permeability measured in the same direction. Significant changes in both permeability and elastic...

... ABSTRACT: Laboratory results from triaxial deformation tests on sandstone are presented where changes in the elastic P-wave and S-wave velocity have been measured and compared, and in addition the rate and amplitude distribution of acoustic emission events has been recorded. The experiments...

... mechanical features. Surface seismic recordings give wave velocities at depth, and when a borehole has been drilled, VSPs (Vertical Seismic Profiles) and sonic logs contribute more detailed analyses. However, the acoustic waves provide only indirect information, so there is a need for interpretation methods...

... (1) where Vm is the P wave velocity of the rock matrix, and Vf is the velocity of the 1081 pore fluid. When both Vm and Vf are fixed, the only variable in the equation is porosity. To a first order this simple equation appears adequate for clean sandstones in the middle range of porosity (10% < 4...

... ABSTRACT This study is carried out to study the engineering properties of soft rocks having uniaxial compressive strength about 10 to 100 kg/cm2. Recently measurement of elastic wave velocity becomes useful method to estimate Young's modulus and compressive strength of concrete and rock as non...

... and joints Attitude Range of collapse Holes of sonic prospecting Figure 1. The geological expanded view of Xiakeng Tunnel rail transportation wave velocity rock behaviour ground transportation variation characteristic reservoir geomechanics displacement convergence relaxation zone...

... and lithography of the calcareous rocks and the successful methods of sampling them. The field tests included seismic refraction studies, uphole and crosshole wave velocity studies and Menard Pressuremeter tests. The laboratory tests comprised. of index tests and the strength-deformation evaluation tests...