超临界二氧化碳、氮气和水的射流应力特性研究

he high-pressure water jet is an efficient rock breaking method. Current researches also prove that the supercritical carbon dioxide jet is more efficient in rock breaking than the water jet but there is a lack of systematic mechanism explanations. In order to fill in the space in researches, this paper describes physical properties of fluids with the equation suggested by NIST, established the method of solving the stress field of rock under coupling effects of the fluid pressure field and the temperature field, and revealed the stress responding mechanism. The paper analyzed the jet field and the stress field in the condition of stratums and found that jets decreased the temperature of rock and generated the temperature stress. The temperature decreasing effect decreased in the sequence of carbon dioxide, nitrogen and water. The stress in rock breaking decreased in the sequence of carbon dioxide, nitrogen and water. When jet pressure drop decreased or the elastic modulus of rock increased, carbon dioxide jets had more obvious advantages over nitrogen and water jets in rock breaking. It showed that supercritical carbon dioxide jets had the potential to effectively breaking rock in deep stratums.