This phase can be further divided into two parts: the first unloading stage (segment CD), where stress continuously decreases and the dynamic stress–strain curve rapidly descends, with the slope of the unloading curve being greater than that of the loading curve, indicating that the unloading modulus is greater than the loading modulus; the second unloading stage (segment DE), elastic deformation energy continues to accumulate as cracks propagate in the rock sample, resulting in a decreasing trend in strain.
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Experimental Study on the Dynamic Properties of Granite with Filled Joints of Different Thicknesses.
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