Estimate of the interchamber pillar stability based on the damage accumulation criterion

The article studies velocities of P-waves and S-waves in a natural sandstone specimen exposed to axial thrust. The cylindrical core specimen 1 m long and 0.08 m in diameter is composed of different size blocks. Anomalous velocities of the P-waves and S-waves (4-6 kHz) have been revealed by measurements taken in the whole specimen, in its separate blocks and at contacts surfaces between the blocks. The velocities in the whole specimen are much smaller than in its separate blocks. The interblock contacts detain and decelerate the waves. With smaller spacing at the contacts between the blocks, the wave velocities linearly drop to anomalously low vales (hundreds m/s). With higher pressure on the specimen, the wave velocities nonlinearly grow and the time delay reduces. The curve V P / V S -pressure has a peak (1 MPa) that appears for separate blocks and for the whole specimen. The anomalous velocities V P and V S are alleged to appear due to inelastic processes at microcontact surfaces under acoustic wave propagation in the blocky medium.

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Estimate of the interchamber pillar stability based on the damage accumulation criterion

Cited by 3 publications

References 8 publications

Connection between the deformation properties of rock joints and their fractal dimension

Connection between the deformation properties of rock joints and their fractal dimension

Estimation of state and properties of various-scale geomechanical objects using solutions of inverse problems

Anomalous P-Wave and S-Wave velocities in a blocky natural sandstone specimen

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