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Keywords: critical state
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Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-439
... dependent. Dilative behaviour was observed from consolidated undrained tests conducted on saturated samples even though their initial states lie above the critical state line. On the other hand, compressive behaviour was observed from the constant water content tests on unsaturated samples. For the field...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-041
... in the range u < f < cs , where u is individual particle slip friction and cs is the frictional strength at critical state. At the densest state up to peak f = u and at its loosest state (critical state where dv/d a = 0), f = cs. Rowe introduced the theoretical finding by Horne (1965...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-199
... of testing are presented and compared with corresponding critical state model prediction. INTRODUCTION Constitutive relations form an important basis of soil mechanics. In this connection, the failure of soil is a significant aspect of its mechanical behaviour. Localized failure which is commonly observed...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-018
... is the Critical State theory (CS-theory), described in detail by Atkinson and Bransby (19781, In the CS-theory three parameters are identified as critical variables that control the mechanical behaviour of soils. These are the stress invariants, which in case of triaxial test are p' = [113 (01 2°3) -u l (01...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-112
... and undrained conditions can lead to steady state flow. This failure has identical properties to the critical state. Failures adjacent to oil wells subjected to large drawdown pressures are most probably due to the rock locally attaining the critical state. This is a cause of solids production. Similar...

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