Study on Effect of Liquid CO2 Blasting Crack Propagation in Coal Rock with Natural Fissure based on ANSYS/LS-DYNA

Wenzhou Zhang; Liankang Li

doi:10.54097/v1tjgx17

Authors

Wenzhou Zhang
Liankang Li

DOI:

https://doi.org/10.54097/v1tjgx17

Keywords:

Liquid CO2 Blasting, Natural Cracks, Stress Concentration, Initial Guide Crack, Crack Propagation Law

Abstract

In order to study the influence of natural cracks in rock mass on the blasting effect of liquid CO2, and to better promote this technology, the law of energy propagation and crack propagation after blasting of liquid CO2 in coal rock mass containing natural cracks was studied based on ANSYS/LS-DYNA numerical simulation software. The results show that natural cracks in coal and rock will block the energy propagation after liquid CO2 blasting, reflect most of the stress wave energy, and form a crushing zone of 49.6cm×10.6cm in front of natural cracks in coal and rock. Stress concentration occurs at the tip of the natural crack, forming the initial guide crack, changing the direction of crack development. The crack develops along the direction perpendicular to the natural crack of coal rock mass, and the final shape of crack growth is 69.8cm. The research results can provide a theoretical basis for the determination of the actual blasting scheme.

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