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Experimental research and energy analysis of a new type of dry ice powder pneumatic rock breaking technology

International Journal of Mining Science and Technology 2023年第4期33卷 423-435页

作者： Xiaofei Wang Shaobin Hu Enyuan Wang Qiang Zhang Bing Liu Key Laboratory of Gas and Fire Control for Coal Mines(China University of Mining and Technology)Ministry of Education Xuzhou 221116China National Engineering Research Center for Coal Gas Control China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and TechnologyXuzhou 221116China School of Safety Engineering China University of Mining and TechnologyXuzhou 221116China Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering HoHai UniversityNanjing 210098China Tunnel and Underground Engineering Institute College of Civil and Transportation EngineeringHoHai UniversityNanjing 210098China China Electric Construction East China Survey and Design Institute Hangzhou 311122China

When the traditional drill and blast method is applied to rock crushing projects,it has strong vibration,loud noise and dust pollution,so it cannot be used in densely populated areas such as urban public *** developed a supercritical CO_(2)true triaxial pneumatic rock-breaking experimental system,and conducted laboratory and field tests of dry ice powder pneumatic *** characteristics of the blast-induced vibration velocity waveform and the evolution of the vibration velocity and frequency with the focal distance were analyzed and *** fracturing mechanism of dry ice powder pneumatic rock breaking is *** research results show that:(1)The vibration velocity induced by dry ice powder pneumatic rock breaking decays as a power function with the increase of the focal distance;(2)The vibration frequency caused by dry ice powder pneumatic rock breaking is mainly distributed in 1–120 *** to the dispersion effect,the dominant frequency of 10–30 Hz appears abnormally attenuated;(3)The traditional CO_(2)phase change fracturing energy calculation formula is also applicable to dry ice pneumatic rock breaking technology,and the trinitrotoluene(TNT)equivalent of fracturing energy is applicable to the Sadovsky formula;(4)dry ice powder pneumatic rock breaking is shock wave and highenergy gas acting together to fracture rock,which can be divided into three stages,among which the gas wedge action of high-energy gas plays a dominant role in rock mass damage.

关键词： dry ice powder pneumatic rock breaking Cracking mechanism Energy analysis Vibration frequency

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