Variable model for mechanical parameters of soft rock and elastoplastic solutions for tunnels considering the influence of confining pressure

The accurate understanding of the influence confining pressure on mechanical characteristics soft rock and how to comprehensively consider this in elastoplastic analysis tunnels are fundamental premises for effective evaluation deformation control stability tunnels. Therefore, paper firstly investigates effect strength phyllite slate, using triaxial experiment results proposed variable models parameters ( E , v c φ ) with variation. Secondly, according second stress state around these rock, a new solution is devised, which simultaneously considers surrounding rock. Finally, solution, multiple factors (initial pressure, supporting force, tunnel radius) displacement analyzed.