406 4TH CAN. PERMAFROST CONF. (1982) Borehole creep and relaxation tests in ice-rich permafrost
The experience gained with the pressuremeter creep tests in the last ten years shows that, because of the equipment limitations, one such test can furnish creep data only for relatively short creep times and for a medium range of stress. Borehole relaxation tests are the alternative to borehole cree...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.617.4300 http://pubs.aina.ucalgary.ca/cpc/cpc4-406.pdf |
| Summary: | The experience gained with the pressuremeter creep tests in the last ten years shows that, because of the equipment limitations, one such test can furnish creep data only for relatively short creep times and for a medium range of stress. Borehole relaxation tests are the alternative to borehole creep tests in the determination of the creep parameters of frozen soils. Their advantage is that the strain is controlled and the stress variation observed, so that there is no danger of exceeding the volume capacity of the cell. Consequently, bore-hole relaxation tests can easily cover the area of low stresses and can be performed for long periods of time. The question arises, however, whether the creep parameters deduced from creep and relaxation tests, respectively, are equivalent. A field study, carried out recently at a permafrost site near Inuvik, N.W.T., attempted to answer this question and the principal results of that study are discussed. Une strie d'essais de dilatation de trous de sonde ont ete effectuks dans du pergklisol riche en glace a Inuvik (T.N.-0.) a I'aide du pressiometre de MCnard et du dilatometre de la Colorado School of Mines (CSM). Le pressiometre a CtC employe pour effectuer des essais a court terme a charge etagee sous contrainte contrdke et des essais de fluage sous contrainte constante. La cellule CSM a CtC |
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