Advances in Civil Engineering / 2021 / Article / Tab 2

Research Article

Study on the Retention of Large Mining Height and Small Coal Pillar under Thick and Hard Roof of Bayangaole Coal

Table 2

Borehole parameters table at measuring point.

DotLocationElevation (m)Depth (m)Hole depth (m)

13-1 high fructose 6 conduction point of coal return ventilation roadway6506208
2Guide point of S4 in the main channel 3111036516208
3Guide point J42 of the auxiliary channel on the 311102 working face6466368

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