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Experimental Investigation on Influencing Factors of Rock Fragmentation Induced by Carbon Dioxide Phase Transition Fracturing.
- Source :
- Shock & Vibration; 9/7/2021, p1-9, 9p
- Publication Year :
- 2021
-
Abstract
- Carbon dioxide phase transition fracturing is a novel physical blasting technique, which is gradually used in mining and underground space engineering. The improvement of its rock breaking efficiency is the key concern in the application. In this paper, field experiments of CO<subscript>2</subscript> phase transition fracturing were conducted. Based on the strain monitoring and fracturing crater volume measuring, the variation of CO<subscript>2</subscript> filling amount and shear sheet thickness on rock fragmentation of CO<subscript>2</subscript> phase transition fracturing was investigated. The experimental results indicated that the fracturing crater is shaped as an elliptical cone that is longer in the jet direction and shorter in the vertical jet direction. With the increase of the CO<subscript>2</subscript> filling amount, the excavated crater volume gradually increases, but the growth rate gradually decreases. The powder factor is constant within a certain charge amount, and after exceeding this charge amount, the powder factor of CO<subscript>2</subscript> increases significantly. As the shear sheet thickness increases, although the consultant peak stress gradually increases, its growth rate is still unchanged. The crater volume and its growth rate gradually increase in the same situation. Moreover, with the shear sheet thickness increase, the CO<subscript>2</subscript> powder factor decreases continuously, and the decline rate remains unchanged. [ABSTRACT FROM AUTHOR]
- Subjects :
- PHASE transitions
CARBON dioxide
UNDERGROUND areas
Subjects
Details
- Language :
- English
- ISSN :
- 10709622
- Database :
- Complementary Index
- Journal :
- Shock & Vibration
- Publication Type :
- Academic Journal
- Accession number :
- 152316145
- Full Text :
- https://doi.org/10.1155/2021/6674485