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Drained test, long time

The long-time drained (or ``jacketed'') test for a double-porosity system should thus correspond to the condition $\delta p_f^{(1)} = \delta p_f^{(2)} = 0$ so that the total volume obeys $\delta e = - a_{11}\delta p_c$. It follows therefore that  
a_{11} \equiv {{1}\over{K^*}}.
 \end{displaymath} (19)

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