Technical Review of the Lined Rock Cavern Concept and Design ...
Technical Review of the Lined Rock Cavern Concept and Design ...
Technical Review of the Lined Rock Cavern Concept and Design ...
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Draft <strong>Technical</strong> <strong>Review</strong> <strong>of</strong> <strong>the</strong> <strong>Lined</strong> <strong>Rock</strong> <strong>Cavern</strong> (LRC) <strong>Concept</strong> <strong>and</strong> <strong>Design</strong> Methodology B-2<br />
where T = tensile strength,<br />
d = zone size,<br />
E = loading stiffness<br />
Eu = unloading stiffness,<br />
T =<br />
GIC = critical energy release rate, <strong>and</strong><br />
KIC = critical toughness.<br />
Stress<br />
T<br />
K<br />
IC<br />
d ⎛ E ⎞<br />
⎜1+ ⎟<br />
2 ⎝ Eu<br />
⎠<br />
Slope = E<br />
Strain<br />
where E * = unloading stiffness <strong>of</strong> <strong>the</strong> surrounding material,<br />
Slope = E *<br />
(B-4)<br />
El = local (material) unloading stiffness; El = � in <strong>the</strong> case <strong>of</strong> infinitely brittle material,<br />
<strong>and</strong><br />
Eu =<br />
* ⎧ ⎪E<br />
⎨<br />
⎪⎩ El *<br />
if El> E<br />
.<br />
*<br />
if E > El
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