confining pressure


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confining pressure

[kən′fīn·iŋ ‚presh·ər]
(geology)
An equal, all-sided pressure, such as lithostatic pressure produced by overlying rocks in the crust of the earth.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Strength and acoustic velocities increase with increasing confining pressure. With increasing temperature, kerogen becomes much softer than the matrix minerals.
After the fracture was filled with distilled water, confining pressure was applied to the vessel by injecting water using a hand pump.
The influence factors of dynamic strength mainly include relative density, confining pressure, initial shear stress, test method, sampling pattern and lithology etc.
Figure 2 shows that the changes of sandstone permeability with confining pressure at different heating temperatures.
[11], the Anisosoft model is employed to carry out a numerical simulation of the compression under different confining pressures. The mechanical parameters of the artificial layered rock mass specimen (cylinder specimen with a diameter of 5 cm and a height of 10 cm) from laboratory tests are shown in Table 1.
It can be seen from Figure 5 that, due to the effect of confining pressure [[sigma].sub.3], the ordinate intercept of reference systems II and III is not 0.
According to Table 1 and Figure 8, Young's modulus showed almost no change in increment as the confining pressure increased from 0.5 MPa to 6 MPa, and the average Young modulus was 21.34 GPa.
The confining pressure [[sigma].sub.3] was set as 5 MPa, 10 MPa, 20 MPa and 30 MPa, respectively.
Three samples of standard sizes from each tube were tested under the increasing confining pressures and strains rates.
The elastic modulus of oil shale will greatly influence the permeability under the confining pressure, especially in in-situ pyrolysis conditions.
Usually, the stress sensitivity experiments of clean sandstone and shale were conducted by increasing confining pressure at first and decreasing later [6-9].