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Abstract The following paper will summarize the experimental and computational research undertaken by

2.2 Effect of In te rn a l H y d ro sta tic P ressu re Following completion of the WS test series, the testing procedure was refined to assess: 1) Uplift pressure distribution along a fracture process zone; and 2) Degradation of m aterial properties (tensile strength, fracture toughness, and fracture energy) due to high water pressure (or stress corrosion). The original WS test was thus altered to enable the application of both an external mechanical (through the wedge), and an internal hydrostatic (through water under controlled pressure) loads, Fig. 1, [8], [9].