Question

c) A borehole was drilled into unfractured rock, where the virgin rock has principal stresses of σ1-100 MPa, σ2-50 MPa, σ3-25 MPa. The major principal stress is vertical, and the borehole was drilled parallel to the direction of the intermediate principal stress. Sketch a cross-section of the borehole, and indicate positions and values of any stresses which you can calculate. Where would you expect shear-type failure, and where would you expect tensile-type failure. Explain whether either types of failure likely for this borehole

Answer 1

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