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

<div>Test design process. (a) Steel drum and wetting coal. (b) Pressurized coal sample. (c) Coal body after embedding thermometers and injecting tube. (d) Liquid nitrogen injection. (e) Temperature display and recording. (f) Layout of thermometers.</div>

Advances in Civil Engineering

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Figure 1

Figure 1: Freezing Method for Rock Cross-Cut Coal Uncovering: Aging Characteristic of Effective Freezing Distance on Injecting Liquid Nitrogen into Coal Seam 

Figure 1 | Freezing Method for Rock Cross-Cut Coal Uncovering: Aging Characteristic of Effective Freezing Distance on Injecting Liquid Nitrogen into Coal Seam 