lithostatic pressure

(redirected from Overburden pressure)
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lithostatic pressure

[¦lith·ə¦stad·ik ′presh·ər]
(geophysics)
References in periodicals archive ?
grains and matrix and hence the compaction caused by overburden pressure is limited to certain specified zones within the rock.
In the research block, the overburden pressure [P.sub.e] is 63.31 MPa, and the initial reservoir pressure [P.sub.i] is 24.17 MPa.
For the other culvert beneath gravel filling of 20 kN/[m.sup.3], the measured pressure was about 1.5 times the overburden pressure. And, then, Spangler (1950) [5] reported the load measurements for seven positive projection culverts with the width ranging from 0.61 m to 2.44 m.
The previous research has shown that the strength reduces due to swelling of expansive soils after absorbing water, and this potential is controlled by the overburden pressure. Therefore, to a large extent, the shear strength relates to the overburden pressure.
Through numerical simulation of the roof load distribution in the goaf by DDA software, He and Zhang found that the loosening area under the pressure arch could not bear the overburden pressure, the principal stress in this region was mainly horizontal stress and the vertical stress was close to zero, and the separated rocks tended to slip off [14].
Finally, several numerical calculations on caprock models with a single fracture subject to coupled THM effects were performed, and C[O.sub.2] permeability of the fracture with respect to different fracture angle, overburden pressure, fluid pressure difference, injected C[O.sub.2] temperature, and initial aperture was, respectively, evaluated.
Following data preparation and compaction trend analysis, the Geolog pore pressure prediction module calculates hydrostatic pressure, overburden pressure, pore pressure, and fracture pressure in a single multi-tab program.
"Standard penetration test procedures and the effects in sands of overburden pressure, relative density, particle size, aging and over consolidation", Geotechnique, vol.
Measurement of the water retention curve is complicated due to the lack of applied overburden pressure on samples from the subsoil during the analysis (Tariq and Durnford 1997).
The floor of this region is located in a new pressure zone because of the overburden pressure and the movement from the expansion to the compaction state.
Confining pressure acting on the rock core has a very important impact on the magnitude of permeability Thomas and Ward [12] found that gas permeability of tight sandstone formations would be markedly reduced with increasing overburden pressure. Permeability reduction of cores due to stress in other formations was also studied by other authors [13-15].
The changes in porosity at different locations of same formation were interpreted to be due to overburden pressure, facies changes, diagenesis and pressure dissolution.