Linguistics

Philosophy

Geotechnical engineering

Materials science

Stress (linguistics)

Social psychology

Overburden pressure

Stress relaxation

Creep

Geology

Paleontology

Psychology

Relaxation (psychology)

Composite material

Disturbance (geology)

Measurement

Cyclic weak disturbance caused by blasting, drilling, earthquake and transport is an important factor to deep rock projects failure. In order to study the influence of cyclic weak disturbance on the stress relaxation of rock under different confining pressures, a step loading stress cyclic weak disturbance relaxation test was carried out on marble, and an impact factor of weak disturbance was defined. The test results showed that the rock peak strength was the smallest under cyclic weak disturbance relaxation; before the peak stress was reached, the relaxation magnitude of weak disturbance increased with the increase of the initial stress level; and it continuously increased with the decrease of the initial stress level after the peak stress. The stress relaxation rate nonlinearly decreased with axial strain levels; by contrast, the initial stress relaxation rate was proportional to the strain level. As the strain increased, the weak disturbance effect presented a nonlinear growth characteristic of first decreasing and then increasing.

Stress relaxation behaviour of marble under cyclic weak disturbance and confining pressures