By using the characteristic of carbon dioxide phase transition of soft rock blasting, high pressure gas can be used. The mechanism of high pressure gas dynamic crushed rock is different of blasting and static rock breaking. Taking a coal mine as an example, according to similarity principle, by establishing the physical model of distributed optical fiber grating, the internal effect of carbon dioxide transformation induced by carbon dioxide in coal is tested. Analyzed the relationship between the gas pressure, the time of action, the strength of the coal and the occurrence of the crack. Through the slit number, length, distribution parameters and the strain to analysis the mechanism of the pressure gas how to break rock which organized by carbon dioxide phase transition, obtain the relationship between the crack rock, rock strength, rock burst, gas pressure, action time and other parameters.

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