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

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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 works. We developed a supercritical CO2 true triaxial pneumatic rock-breaking experimental system, and con-ducted laboratory and field tests of dry ice powder pneumatic rock-breaking. The characteristics of the blast-induced vibration velocity waveform and the evolution of the vibration velocity and frequency with the focal distance were analyzed and discussed. The fracturing mechanism of dry ice powder pneumatic rock breaking is studied. The 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 Hz. Due to the dispersion effect, the dominant frequency of 10–30 Hz appears abnormally atten-uated;(3) The traditional CO2 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 high-energy 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.

Dry ice powder pneumatic rock breakingCracking mechanismEnergy analysisVibration frequency

Xiaofei Wang、Shaobin Hu、Enyuan Wang、Qiang Zhang、Bing Liu

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Key Laboratory of Gas and Fire Control for Coal Mines(China University of Mining and Technology)Ministry of Education,Xuzhou 221116,China

National Engineering Research Center for Coal Gas Control,China University of Mining and Technology,Xuzhou 221116,China

State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Xuzhou 221116,China

School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China

Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,HoHai University,Nanjing 210098,China

Tunnel and Underground Engineering Institute,College of Civil and Transportation Engineering,HoHai University,Nanjing 210098,China

China Electric Construction East China Survey and Design Institute,Hangzhou 311122,China

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State Key Laboratory Open FundNatural Science Foundation of Jiangsu ProvinceKey Program of National Natural Science Foundation of ChinaMajor Scientific and Technological Innovation Program in Shandong ProvinceNational Key Research and Development Program of China

HKLBEF202004BK20201313519340072019JZZY0205052022YFC3004700

2023

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCD北大核心EI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2023.33(4)
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