Distortion course of rock mechanics constitutive experiment in underground engineering

Constitutive experiment is foundamental to rock mechanics.The analysis and calculation will be wrong if the constitutive experiment is distorted. The difference between calculated and measured results is obvious in underground engineering. Based on the analysis of mechanism and experiments, the reason of distortion is presented,and the distortion course is shown with pictures.Mechanical parameters are calculated,and it has proved that the constitutive experiment is distorted.