Energy Dissipation and Damage Evolution during Dynamic Fracture of Muddy Siltstones Containing Initial Damage under the Freeze Thaw Effect.

(3) Both the damage variable and the fractal dimension of the muddy siltstones show an increasing trend with an increase in the number of F-T cycles, and it is more difficult for damage to become superimposed as the damage accumulates to that range causing fatigue (the damage variables ranged from 0.73 to 0.97) while the fractal dimension of the fracture surfaces in the rock still increases.

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With the increasing number of F-T cycles, the energy absorbed in the rock specimens shows a decreasing trend, and the absorbed energy of intact rock and rock specimens containing level-I, II, III, and IV initial damage separately decrease by 44.21%, 55.37%, 53.53%, 55.74%, and 61.20% compared with that before the F-T cycles.

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