Study on Mechanical Properties and Damage Evolution Law of Secondary Destruction Induced by Simultaneous Unloading after the Peak of the Curve of Sandstone

<div>Curves of strain versus time under different confining pressures. (a) Change law of strain-time curve of surrounding rock at 5 MPa. (b) Strain-time curve of surrounding rock at 10 MPa. (c) Change law of strain-time curve of surrounding rock at 20 MPa. (d) Variation rule of strain-time curve for wall rocks at 30 MPa. (e) Variation rule of strain-time curve for surrounding rocks at 40 MPa.</div>

Shock and Vibration

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Figure 8

Figure 8: Study on Mechanical Properties and Damage Evolution Law of Secondary Destruction Induced by Simultaneous Unloading after the Peak of the Curve of Sandstone 

Figure 8 | Study on Mechanical Properties and Damage Evolution Law of Secondary Destruction Induced by Simultaneous Unloading after the Peak of the Curve of Sandstone 