CONVERGENCE MEASUREMENTS IN THE DRY DRILLED 300 M BOREHOLE IN THE ASSE-II SALT MINE
Almost immediately after the successful dry drilling of a 300 m deep borehole from the 750 m level in the Asse mine, diametrial convergence measurements were started at a depth of 292 m at ambient temperature (+-42 degrees C). For a period of about 800 days in-situ creep data were collected. After this time a total diametrial convergence of 17 mm of the 315 mm o-slashed hole was established. On the basis of 200 measuring days a secondary creep law was derived which showed good predictive capabilities. Furthermore diametrial convergence data as a function of the depth of the hole were also collected during the above mentioned period. On account of the results and the accuracy of the measurements anisotropic behaviour of the salt could not be established.
Bibliographic Reference: EUROPEAN APPLIED RESEARCH REPORTS - NUCLEAR SCIENCE AND TECHNOLOGY SECTION, VOL. 5 (1983), NO. 2, PP. 267-324 (EUR 8670 E).
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Record Number: 1989122017000 / Last updated on: 1987-01-01
Available languages: en