RESEARCH AND EXPERIMENT OF DRILLING HOLE UTILIZING HIGH PRESSURE WATER JET FLOW

Using high pressure water jet flow to drill hole is a high efficiency and easy operating method and tool. Due to single jet nozzle produce small impacting area on rocks and jet nozzle rotate system unreliable,it is limited in application. This poper introduces the research work and labotatory experiments about jet nozzle specially designed with guiding parts that can adjust rotating jet. The results of experiments have shown rotating jet system can produce enough impacting area and make diameters of hole larger than nozzle’s one by 40 and because the failure of rock is shear manner,the efficiency of rock failure is more than 10 times of conventional one,and its threshold pressure is about as half as conventional one. The experiments of drilling hole on surface show the rotating jet system has ability to make rock failure and drilling hole.