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. 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 pressures, the time of action, the strength of the coal and the occurrence of the crack. Using PFC software to establish different rock mechanics properties of soft rock numerical model, the hole and the layout of different parameters in the model, observed under different pressure, time conditions, and the expansion of the rock mass surrounding the fracture blasting holes. Through the slit number, length, distribution parameters to analysis the mechanism of dynamic pressure gas rock breaking, obtain the relationship between the crack rock, rock strength, rock burst and gas pressure and other parameters.

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