How to decide the parameters of bolted rock mass is an important and complicated problem in geotechnical engineering. Taking unloading into account

the variation regularity of compression strength

Poisson′s ratio

elastic modulus

c and friction angle ? values were studied and simulated by computer; and different loading-unloading paths

anchoring angle

strength of rock mass were taken into account. The computed results show that the influence of unloading process before reinforcement should not be neglected. Finally

some experimental data were used to testify the above-mentioned analysis.