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Mr. Max Ramey <br />.lone 17, 2003 <br />Page 5 <br />Table 2. Material Properties and Field Conditions Used in the Numerical Evaluation <br />Temperatu-e-Dependent Rock Strength <br />Rock mass unconfined compressive strength UCS ~ 70°F 2553 psi <br />Rock mass unconfined compressive sven_th UCS Ccu 300°F 1000 usi <br />Rocl: mass unconfined compressive strength UCS @ 420°F 1000 psi <br />(extrapolated) <br />Angle of internal friction nn 70°F 22° <br />Angle of internal friction (n7 300°F I 1 ° <br />Angle of internal friction ~ 420°F (extapolated) I I° <br />Tensile strength 0 psi <br />Elastic Properties <br />Young's modulus ct 70°F 1.403 x 10° psi <br />Young's modulus (cil 150°F 0.769 x 10`' psi <br />Young's modulus ~ 300°F 0.32 x IO`' psi <br />Youne's modulus ~ 420°F (exuapolatedl 0.3>3 x 10`' usi <br /> Thermal Properties <br />Thermal conductivity (ambient to 250°Fl 2.29 Btu/ft/hr/°F <br />Thermal conductivity tic) 300°F 0.81 Btu/tt/hr/°F <br />Thermal conductivity (c~ 420°F 0.81 Btu/ft/hr/°F <br />Snecitic heat capacity of rock 0.3 Btu/Ib/°F <br />Specific weight of rock 134 Ibs/ft' <br />Thermal exuansion coefficient 4.6 x 10° h/ft/°F <br /> Initial Conditions <br />!tt silo stress Florizontal stress =Vertical stress = <br /> Hydrostatic stress induced by weight of <br /> overburden <br />Temperature ct, eround surface 64.1°P <br />"femuerauu'e ~ 1000 ft depth 77.0°F <br />femuera[ure a 1665 ft depth (Too Cavitvl 82.5°F <br />Temueranu'e ~, 1927.5 ft depth (Mid Cavitvl 84.9°F <br />Temperature (cr) 2190 ft death (Bottom Cavitvl 89.>°F <br />Temperanu'e ~. 2500 ft death 95.0°P <br />100-psi increments. Model outputs include time-dependent temperature distributions. geometry <br />of mechanically yielded rock. and mechanical stability factors ofsa(cq~. <br />The strength properties in the crown pillar are of particular interest in the stability <br />analysis of the caverns. The laboratory strengths have been reduced to reflect the crock mass <br />strength and strength reduction with temperature. The data on laboratory strength of the <br />nahcolitic oil shale at elevated temperature is presented in AAI (1998). Tests were completed on <br />core from Well 20-3, located in the Pilot Test area. The laboratory strength of the nahcolitic oil <br />Agapito Associates, Inc. <br />