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Question: the stress in a granitic rock mass has been measured...

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The stress in a granitic rock mass has been measured by the hydraulic fracturing technique. Two tests were conducted in a vertical borehole: one test at a depth of 500 m, and the other test at a depth of 1000 m. The results were as follows:Shut-in pressure, Ps Breakdown pressure, PB (MPa) 14.0 24.5 Depth (MPa) 8.0 16.0 500 1000

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