Vertical Shaft Excavation Shaping and Surrounding Rock Control Technology Under the Coupling Action of High Ground Stress and Fracture Formation

Abstract

The stability discrimination method of surrounding rock in vertical shaft construction and the safety technology of shaft construction under the geological condition of a super-thick crush belt were studied. Through the establishment of a shaft surrounding rock mechanical model, quantitative analysis was conducted on the displacement of broken surrounding rock during shaft construction under the coupling action of ground pressure and super-thick crush belt strata. A method for the stability determination of surrounding rock in shaft construction was put forward. Combined with the adjustment of supporting materials and construction technology for shaft construction, the methods of effective control of the displacement velocity of surrounding rock and cyclic time control of shaft construction technology were put forward. Through the construction time per unit cycle and time control required for the maximum allowable displacement of shaft surrounding rock, the safety technology method of vertical shaft construction through super-thick crush belt penetration in the thousand-meter scale large fault was obtained. Through technological innovation, this provided a scheme for the safe and efficient construction of a vertical shaft under special geological conditions. It laid a solid foundation for the achievement of zero accidents in vertical shaft construction.