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Keywords: principal stress
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Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-521
...; and under heavy rainfall and water table rise. Figure 11 presents an example of the distribution and magnitude of maximum initial principal stresses. It was found that the maximum principal stresses and deformations are increased under heavy rainfall condition. Table 4 presents the results of the...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-399
.... Moreover, the variability of the materials may affect the reliability of the prediction of their future in-service performance. two-parameter model concrete compressive strength resilient modulus variation flakiness index rcc aggregate specimen loading principal stress Nataatmadja deviator...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-218
... left ideal due to which stress also dropped and the sample seemed to suck water. The results of drain test on overconsolidated sample with overconsolidation ratio 5 have been reported in Fig. 4, 5 and 6. Fig. 4 shows variation of deviators stress and ratio of major & minor principal stresses with axial...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-250
... stress redistribution in the embankment. When the foundation ground beneath an embankment is fully liquefied, the vertical stress near the bottom boundary of embankment should become a principal stress because of the loss of the tangential stress at the bottom boundary due to the high excess pore water...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-527
... mass Reservoir Characterization principal stress fracture pattern variation situ stress fracture splay magnitude variation main fracture stiffness distinct element method THE EFFECT OF FRACTURE PATTERN ON IN SITU ROCK STRESSES STUDIED BY THE DISTINCT ELEMENT METHOD Shengrui Su1 , Ove...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-616
... ABSTRACT: The influence of Poisson"s ratio on overcoring was investigated using data from 47 tests. In these tests both the CSIRO HI triaxial cell and the triaxial cell developed by Swedish State Power Board were used. Boreholes drilled parallel to the major principal stress resulted in higher...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-582
... principal stress stress field Magnitude reservoir geomechanics stress magnitude yilgam craton stress measurement principal stress tectonic stress Australia ON THE PREDICTION OF ROCK STRESS 1 2James R. Enever and Max F. Lee ABSTRACT The impact of stress on the performance of underground...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-057
... the change of temperature with time at 50 cms above the top of the heat source. Figure 8 shows the maximum and minimum principal stress versus time at the same point. The shoulder of the stress curve occurs after 10 days, compared to 20 days for the temperature curve. In other words, the stress curve...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-042
... process can trigger excess pore pressures. According to the Mohr theory, the orientation of failure planes depends on the direction of the principal stresses; in particular, failure plane forms an angle of 4S -q/2 to the direction of the major principal stress. Experimental researches basically confirm...
Proceedings Papers

Paper presented at the ISRM International Symposium, September 10–12, 1990
Paper Number: ISRM-IS-1990-017
... displacement minor principal stress right wall Upstream Oil & Gas sidewall excavation reservoir geomechanics powerhouse cavern stress analysis MPa Reservoir Characterization cavern contour scale 1 tensile-stress area principal stress consecutive excavation stage principal...
Proceedings Papers

Paper presented at the ISRM International Symposium, September 10–12, 1990
Paper Number: ISRM-IS-1990-023
... stress field structural domain Magnitude namaqualand metamorphic complex South Africa deposit carolusberg vertical stress province principal stress Broken Hill Reservoir Characterization Situ stress Determination stress determination Upstream Oil & Gas sigma 1 reservoir...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-181
... oil sand complex reservoir minimum principal stress bitumen Upstream Oil & Gas wellbore storage breakdown pressure kPa Drillstem Testing pressure data Workshop Injection Rate principal stress interpretation fracture micro-frac test stress measurement hydraulic fracturing...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-003
... ABSTRACT: To clarify the effect of the intermediate principal stress on the strength and deformational behavior of rocks, three sandstones, marble, and shale were deformed under true triaxial stress state in which the intermediate principal stress is not equal to the minimum nor to the maximum...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-005
... conditions, close to those, acting within the massif, are described. The program on mechanical tests of rocks is carried out, depending upon the calculated qualitative changes of principal stresses and three-di- mensionally stressed states near the mine workings. The developed ener- gy criterion of rock...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-128
... ABSTRACT: A technique has been developed by which strain relaxation measurements can be used to determine the direction and magnitude of the stress field in the Danian Chalk formation. Direction of induced fractures is determined by the direction of the least principal stress, therefore, this...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-133
... a good estimate of the principal stress directions can be obtained from the shape of the disc. To investigate the formation of the shape of these discs, a fully 3-D elastic boundary element analysis vas implemented, to calculate the stress and extension strain paths experienced by a core during...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-104
... stress dependent elastic moduli minor principal stress iteration Upstream Oil & Gas variation major principal stress principal stress reservoir geomechanics boundary loading axisymmetric case boundary condition Santarelli Reservoir Characterization outer boundary loading...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-080
... Reservoir Characterization inward correspond safety factor atomic energy mechanism radial strain shaft wall reservoir geomechanics move inward stress state creep Upstream Oil & Gas principal stress plutonic rock equation estimation mcdirc radial direction stability...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-152
... dominantly extensional, characterised by salt diapirism, overpressuring and growth faulting. More than 120 hydrocarbon exploration wells have been drilled. Smaller horizontal principal stresses, O'h' have been estimated from leak-off tests in 22 wells to depths of 6 kilometers. Together with pore pressures...
Proceedings Papers

Paper presented at the ISRM International Symposium, September 12–16, 1988
Paper Number: ISRM-IS-1988-028
... stable orientation, from rock pressure point of view, will 'be ob tained when the axis of the opening m~ kes an angle of 15-30g to the horizon- tal projection of major principal stress. - Parallelism with important joint sets should be avoided. - The axis should be near to bisection - line of the maximun...

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