Abstract
Experiments have been carried out on a polymethyl methacrylate plate in which holes were drilled randomly in order to investigate the elastic behaviour of this depleted system near the percolation threshold. Compression and traction tests were conducted on the plate with both hollow holes and refilled holes. A comparison of the elastic moduli for both situations shows that there is a significant difference between the elastic properties of the structures of 'depleted refilled' solids and the 'depleted' solids. When extrapolated to the case of fractured rocks with small porosity, the authors' results lead to the conjecture that the critical exponent T for the elastic modulus could be closer to De Gennes' universal exponent (t=1.3) than to the exponent for depleted solids (T=3.96).
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