Raises advance using borehole hydraulic technology

Abstract

Based on an analysis of existing methods for raises advance, the safest, most productive, and low-cost method is hydraulic well technology. This method offers advantages such as low operation and flow rate, flexibility in managing concentration and volume of work, safety, and compatibility with traditional mining technologies. Studies on raises advance using borehole hydraulic technology have demonstrated the process’s effectiveness in rock mass destruction by water pressure jets. Effectiveness depends on the rocks’ physical and hydrotechnological properties, hydrodynamic characteristics, and water jet impact technology on the ore mass. The primary design parameter is the maximum radius of rock mass destruction, directly proportional to the axial dynamic pressure of the jet at the nozzle exit and inversely proportional to the ore’s uniaxial compressive strength. Dependencies of relative dynamic pressure changes on the water jet’s relative length were also identified. The hydraulic jet method’s effectiveness is ensured by simplified technology, high penetration speed, and savings on energy and materials. Consequently, stationary and mobile modular-type hydraulic monitor complexes have been developed based on the NKR-100MPA or KBU-1 drill-ring, providing automatic control of the hydrodisintegration process using water pressure jets.