... roughness grain diameter borehole wall stabilisation Upstream Oil & Gas Soil Nail pullout test recommendation pullout force Wehr calculation diameter sand anchor granular material mean grain diameter cylinder application installation gravel STABILISATION OF RETAINING...

... of the hard clay layer was constant with depth. The modelling of the tunnel excavation process involved the use of two cylinders, one representing the shield and having a length of 8 m and 9.71 m of diameter, the other representing the lining ring segments with a length of 14 m and 9.52 m of diameter...

..., is tested in the laboratory on dry, jacketed and saturated, unjacketed hollow cylinders of Westerly granite. The samples are subjected to hydrostatic confining pressures up to 140 bars and internally pressurized at a rate near 6.5 bars/sec in a manner analogous to hydraulic fracturing until complete failure...

... characterise satisfactorily the tensile strength of the specimens in any predetermined direction parallel to the axis of the cylinder and can be used with both dry and saturated specimens. The failure induced in these tests is similar to that produced during hydraulic fracture, but the specimen...

... by the thermal inducedstresses due to temperature field change, It has been presented in this paper analytical solution including the two mentioned qeotechnical aspects which allow the usual design of vitrified waste cylinders individually installed into conveniently spaced holes. It should be mentioned...

... that it is impossible to observe any difference in stiffness for various rock types. reservoir geomechanics cylinder membrane determination Reservoir Characterization Upstream Oil & Gas pressurization stiffness Rock Deformability in-situ determination pressure intensifier fracture hydraulic...

... conventional hi cell borehole metals & mining cylinder worotnicki Rock stress HI cell reservoir geomechanics yoke gauge instrument gauge stress change cantilever Magnitude epoxy cement load change installation expansion Proceedings of the Intemational Symposium on Rock Stress and Rnr.k...

... encapsulated in an epoxy cylinder, which is cemented into a borehole in rock and so ideally acts as a "welded" elastic inclusion in an elastic host mass. Analytically the solid inclusion is a special case of a hollow cylindrical inclusion with zero internal radius, just as the Leeman/CSIR triaxial stress cell...

.... This is the case with shear cracks (fig. 1.a); similar phenomena happen with other geometries, e.g. for thick follow rock cylinders (fig. I.b), which will be considered later. With these reserves, we can admit the following laws from classical triaxial strain-controlled tests we have performed in our laboratory...