METHOD OF ARRANGEMENT OF SEMI-STEEP TRENCH Russian patent published in 2017 - IPC E21C41/26 

FIELD: mining.

SUBSTANCE: method provides arrangement of semi-steep trench by means of hydraulic backhoe excavators and motor transport capable to pass steep slopes. The trench after the rock mass blasting out within its borders is arranged in several stages, by dividing the steep trench into horizontally wedge-shaped layers by the height defined by maximum depth of excavator digging. The slope of the upper layers wedge-shaped parts base is taken as technical, equal to excavator gradeability. The wedge-shaped part base slope of the lower last layer is considered as technical, equal to the steep slope of the trench in the final position. The upper layers contoured in such a way are worked off with the excavator lower digging consistently from top to down. The horizontal part of the lower last layer is worked off with an excavator lower digging. The remaining wedge-shaped part, enclosed between the technical and technological bases of the wedge-shaped layer part, is moved with a bulldozer beyond the trenches, where it is loaded into vehicles and taken to the surface.

EFFECT: invention can improve development efficiency.

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