Based on the Mohr-Coulomb strain softening model

applying the convergence confinement method to analyze the interaction of surrounding rock and support in high stressed soft rock

the characteristic curves of the typical support structure are constructed. Using the FLAC3D numerical simulation software to analyze the influencing factors of interaction of surrounding rock and support

such as strain softening model

dilatancy angle

different roadway types; and then the stability of support system is analyzed. The results show that: considering the strain softening behavior of the surrounding rock required support pressure are quite different with the calculation results of the conventional elastoplastic model; the dilatancy angle is less impact on the rock stress release process and the interaction of surrounding rock and support; the surrounding rock of roadway which required the support pressures are different in different sections and section points. The stability of the initial support system is the ultimate key to the stability of surrounding rock and support systems; using convergence confinement method to evaluate the stability of early support system of high stressed soft rock. The results have guiding significance for the supporting structural design and construction of high stressed soft rock roadway.