Freezing Method for Rock Cross-Cut Coal Uncovering: Aging Characteristic of Effective Freezing Distance on Injecting Liquid Nitrogen into Coal Seam

<div>Temperature change in different positions in coal. (a) Test temperatures of No. 1 and No. 2 thermometers. (b) Test temperatures of No. 3∼No. 10 thermometers.</div>

Advances in Civil Engineering

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Figure 3: Freezing Method for Rock Cross-Cut Coal Uncovering: Aging Characteristic of Effective Freezing Distance on Injecting Liquid Nitrogen into Coal Seam 

Figure 3 | Freezing Method for Rock Cross-Cut Coal Uncovering: Aging Characteristic of Effective Freezing Distance on Injecting Liquid Nitrogen into Coal Seam 