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s V (psi ) = 1.25 z (ft) Dip Dir. s = 2,078 + 0.53 z Strike Dir. s = 121 + 0.55 z

Very Large-Cavity Geotechnical Site Investigations at DUSEL – K. Lande, B. Haimson, L. Murdoch, C. Thurber, H. Wang , M. Zoback. Measure Twice, Excavate Once.

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s V (psi ) = 1.25 z (ft) Dip Dir. s = 2,078 + 0.53 z Strike Dir. s = 121 + 0.55 z

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  1. Very Large-Cavity Geotechnical Site Investigations at DUSEL – K. Lande, B. Haimson, L. Murdoch, C. Thurber, H. Wang , M. Zoback Measure Twice, Excavate Once Tesarik, Johnson, Zipf, and Lande (2002) – Initial Stability Study of Large Openings for the National Underground Science laboratory at the Homestake Mine, Lead, SD • Acquire stress values in Yates Member of Poorman Formation in the vicinity of proposed cavity sites using hydrofracturing and borehole breakout analysis • Determine the poroelastic properties of the rock mass at scales of meters using borehole pressurization methods • Characterize and monitor the rock mass in and between the boreholes using fiber‐optic methods and geophysics. sV (psi) = 1.25 z (ft) Dip Dir. s = 2,078 + 0.53 z Strike Dir. s = 121 + 0.55 z

  2. Budget Request for Very Large-Cavity Geotechnical Site Investigations at DUSEL – K. Lande, B. Haimson, L. Murdoch, C. Thurber, H. Wang , M. Zoback

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