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Geothermal Energy

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Fig. 8 | Geothermal Energy

Fig. 8

From: Estimating in situ rock mass strength and elastic modulus of granite from the Soultz-sous-Forêts geothermal reservoir (France)

Fig. 8

Hoek Brown failure criteria for EPS-1 over the depth interval 1400–2200 m; a comparison of intact strength (using Eq. 1 for Co = 140 MPa (solid line) and 200 MPa (dashed line) and m i  = 30, see text for details) and rock mass strength (using Eq. 3) for Co = 140 MPa and m i  = 30; b comparison of fracture density and resulting rock mass strength for Co = 140 MPa and three different m i values (25, 30, and 35)

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