Research on fracture shape of high stress roadway floor

In order to study the rupture form of the high stress roadway floor and the development law of the shear zone, research methods such as laboratory experiments, theoretical analysis, numerical calculation, and field test were comprehensively adopted. By establishing a strain softening model of rock, the formation mechanism of shear zone in the process of rock compression deformation and failure was studied. The error of peak stress and residual strength between the simulation and the laboratory test was from 10% to 20%, and the model can well reflect the mechanical characteristics of strain softening after peak; based on this strain softening constitutive relationship, a numerical model for strain localization analysis of the surrounding rock of high stress roadway was established, and the development law and fracture shape of the shear zone of high stress roadway floor were systematically analyzed. The results of borehole peek show that the deep high stress roadway floor will form local fracture and deformation, and the simulation research results are consistent with the actual roadway floor failure shape.