Mechanical Properties of Sandstones under Initial Unloading Damage

<div>Change curves of the deformation modulus. (a) The curve of deformation modulus and unloading quantity at the unloading stage. (b) The curve between percentage change of deformation modulus and unloading quantity.</div>

Advances in Civil Engineering

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Figure 9

Figure 9: Mechanical Properties of Sandstones under Initial Unloading Damage 