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Engineering · Civil Engineering
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Q4.6 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 (MPa) 8.0 16.0 Depth Breakdown pressure, PB (MPa) 14.0 24.5 500 1000 Given that the tensile strength, σ. of the rock is 10 MPa, estimate and list the values of σ1, σ2 and σ3 at the two depths State all of the assumptions you have to make in order to produce these estimates. Are any of them doubtful? State whether the two sets of results are consistent with each other, and justify your reasons for the statement. Are the results in agreement with trends exhibited by collated worldwide data?

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