PREVENTION OF SUPPORT FAILURE OF TRUNKS AT CONSTRUCTION ON THE COMBINED TECHNOLOGICAL SCHEME
The developed method of the advancing unloading of the massif consists in creation of the advancing unloading space which allows realizing convergence of checks in a bottom-hole zone of a shaft before construction of a permanent support. Assessment of in- fluence of the advancing unloading development on change of the intense deformed condition of the massif in a bottom-hole zone of a shaft with a finite element method by modeling of the massif of rocks containing in itself a vertical excavation is executed. The dependence reflect- ing change of percent offull convergence of checks of the shaft realized by unloading devel- opment on the shaft radius relation to radius of the advancing development is.