Skip to main content

Science – Society – Technology

Geothermal Energy Cover Image

Table 2 Mechanical, thermal and thermo-mechanical properties of particles after calibration

From: Borehole damaging under thermo-mechanical loading in the RN-15/IDDP-2 deep well: towards validation of numerical modeling using logging images

  Plagioclase Pyroxene Olivine Titanomagnetite
Young’s modulus (mean value, MPa) 84 162 178 230
Ratio normal stiffness/shear stiffness 2.5 2.2 2.6 2.6
Friction coefficient 0.9 0.9 0.9 0.9
Tensile strength (MPa) 30 75 27 45
Cohesion (MPa) 140 350 126 210
Thermal conductivity (W m−1 K−1) 1.98 4.52 4.48 2.10
Specific heat (J kg−1 K−1) 1112 800 800 910
Linear thermal expansion coefficient (K−1) 6.81 × 10−6 1.00 × 10−5 3.85 × 10−6 3.40 × 10−5