Peculiarities of drilling hard rocks using hydraulic shock technology

Abstract

Purpose. To test the theoretical provisions for calculating the geometric and gas-dynamic parameters of a hydropulse apparatus for strikers using core pipes. Methodology. The research methodology is based on the tests carried out. The tests were conducted between January 6, 2021, and April 28, 2021. The type of test is laboratory bench trials. In the course of the study, methods of synthesis and analysis of information were applied. Finding. The basic design parameters of a hydro-pulse generator capable of operating efficiently with impact machines were obtained during the bench research. The optimal scheme of air flow distribution at the exhaust of the hydraulic hammer has been established. The optimal value of the pressure drop in the operating and blocking modes of operation of the generator is determined. In addition, the optimal value of the ejection coefficient in these two modes of operation of the generator was determined. Originality. The article investigated the technologies of drilling hard rocks in order to optimise the basic geometric parameters of the hydraulic pulse generator, to distribute the working flow in front of the jet blower, to measure the value of the ejection coefficient and pressure drop to clarify the composition and methodology of experiments in borehole conditions. Practical value. The presented study can be used to optimise the drilling technology as well as a basis for training specialists in the field of hard rock drilling using hydraulic percussion technology.