Project DRIBBLE, Petrographic Examination and Physical Tests of Cores, Tatum Salt Dome, Mississippi Page: 53 of 250
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PART IV: PHYSICAL TESTS ON TATUM CORES
Tests for Uniaxial Compressive Strength
81. Uniaxial compression testing was performed by two methods:
(a) standard and cyclic tests, and (b) length-to-diameter tests. All test
specimens were obtained from nominal 4-15/16-in. -diameter cores from hole
WP-l. Testing was done on a 440,000-lb-capacity Baldwin testing machine.
Standard and cyclic tests
82. Five pairs of specimens were tested in this series. In the
standard tests, one specimen of each pair was tested to failure by the
standard unconfined method, i.e. loaded at a specified rate to failure
similar to the way a 6- by 12-in. concrete cylinder would be tested. In
the cyclic tests, the other specimen of each pair was loaded to 1660 psi,
unloaded, and then loaded to failure. Strain was measured with a com-
pressometer with two diametrically opposed 6-in. gage lines. Fig. 1 shows
a specimen in the compression machine with a compressometer attached. The
Fig. 1. Testing a core specimen in compression
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Waterways Experiment Station (U.S.). Project DRIBBLE, Petrographic Examination and Physical Tests of Cores, Tatum Salt Dome, Mississippi, report, January 1963; Vicksburg, Mississippi. (digital.library.unt.edu/ark:/67531/metadc303919/m1/53/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.