How the state of stress and fissuring of a rock mass affects the speed of propagation of elastic waves

1970 ◽  
Vol 6 (2) ◽  
pp. 154-158
Author(s):  
V. I. Panin ◽  
I. A. Turchaninov
Keyword(s):  
Rock Mass ◽  
Elastic Waves ◽  
The State ◽  
State Of Stress ◽  
Speed Of Propagation ◽  
Propagation Of Elastic Waves

The effect of stress on the primary permeability of rock cores—a facet of hydraulic fracturing

1981 ◽  
Vol 18 (2) ◽  
pp. 195-204 ◽  
Author(s):  
R. Heystee ◽  
J.-C. Roegiers
Keyword(s):  
Rock Mass ◽  
Hydraulic Fracturing ◽  
The State ◽  
Stress Conditions ◽  
Breakdown Pressure ◽  
Rock Types ◽  
State Of Stress ◽  
Pressurization Rate ◽  
Fluid Penetration ◽  
Fracturing Experiments

Recent laboratory hydraulic fracturing experiments have shown that fluid penetration into the rock mass adjacent to the borehole being pressurized has a significant influence on the magnitude of the breakdown pressure. One factor affecting the degree of penetration of the pressurizing fluid is the permeability of the rock mass, which in turn is a function of the state of stress present in the rock mass. To study this permeability–stress relationship, a radial permeameter was constructed and three rock types tested. Derived expressions show that during radially divergent and convergent flow in the permeameter, the state of stress in the rock specimen is tensile and compressive respectively. The radial permeameter test results show that the permeability of rock increases significantly under tensile stress conditions and reduces under compressive stress conditions. The results from this study were used to develop a conceptual model which explains the dependency of breakdown pressure levels on the pressurization rate.

Calculation of the state of stress of a rock mass from surface displacements

1975 ◽  
Vol 11 (6) ◽  
pp. 647-650
Author(s):  
B. V. Vlasenko ◽  
F. M. Érlikhman
Keyword(s):  
Rock Mass ◽  
The State ◽  
State Of Stress ◽  
Surface Displacements

scholarly journals Back calculation of in-situ rock stresses for a tunnel project in Himachal, India

2011 ◽  
Vol 42 ◽  
pp. 117-124
Author(s):  
Krishna Kanta Panthi
Keyword(s):  
Rock Mass ◽  
Element Model ◽  
The State ◽  
Stability Assessment ◽  
Rock Support ◽  
Hydroelectric Project ◽  
State Of Stress ◽  
Headrace Tunnel ◽  
Tunnel Instability

Determination of in-situ stresses in the rock mass is necessary for stability assessment and proper design of underground openings. It is important to know the state of stress surrounding the opening so that right and optimum rock support is assigned as preliminary and permanent rock support. However, the majority of long tunnels with high rock cove r face severe tunnel instability problems related to rock stresses. The headrace tunnel of Parbati II hydroelectric project is one of such tunnels, especially the tunnel segment passing through Manikaran quartzite. It is known fact that the extent and type of stress induced instability vary greatly upon rock type, deformability properties, jointing and inter-bedding characteristics in the rock mass. This paper back calculates the state of stress using Phase 2  finite element model  in a TBM  bored segment of  the tunnel and  also briefly reviews mechanical properties of the  intact rock that may have direct link on the  nature of stress induced  instability. It is believed that back calculated stress magnitude may be useful for the stability assessment in other segment of headrace tunnel.

scholarly journals MEASURING DISLOCATION DENSITY IN ALUMINUM WITH RESONANT ULTRASOUND SPECTROSCOPY

2009 ◽  
Vol 19 (10) ◽  
pp. 3561-3565 ◽  
Author(s):  
FELIPE BARRA ◽  
ANDRES CARU ◽  
MARIA TERESA CERDA ◽  
RODRIGO ESPINOZA ◽  
ALEJANDRO JARA ◽  
...  
Keyword(s):  
Dislocation Density ◽  
Elastic Constants ◽  
Elastic Waves ◽  
Resonant Ultrasound Spectroscopy ◽  
Resonant Ultrasound ◽  
Speed Of Propagation ◽  
Propagation Of Elastic Waves

Dislocations in a material will, when present in enough numbers, change the speed of propagation of elastic waves. Consequently, two material samples, differing only in dislocation density, will have different elastic constants, a quantity that can be measured using Resonant Ultrasound Spectroscopy. Measurements of this effect on aluminum samples are reported. They compare well with the predictions of the theory.

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