This paper introduced the technology of increasing propylene yield through optimizing cracking material, adjusting depth of cracking furnace, enhancing operation monitoring of separating system.

With the geometrical size and temperature exchange value of the mine shaft, the possibility of the cracking on the mine freezing shaft would be increased with the depth of the overburden.

Based on the experiments, the mathematical model of pull-out toughness and buried depth of steel fibers after cracking of matrix is developed in this paper.