Table 1 Summary of sample locations and the associated original and residual gas contents.

From: Evolution of fissures and pressure discharge of gas caused by mining of the upper protective layer of a coal seam

Number

Sample location in relation to distance from control point D13 of the 2605 bottom pumping roadway (m)

Azimuth (°)

inclination angle (°)

Original gas content (m3 t−1)

Residual gas content (m3 t−1)

Extraction rate (%)

1

15

90

90

9.8214

9.6542

1.70

2

17

90

90

11.3526

6.5802

42.04

3

19

90

90

10.8203

5.0963

52.90

5

22

90

90

12.0711

6.4478

46.58

6

24

90

90

10.0256

9.5258

4.99

7

26

90

90

12.2812

8.9304

27.28

  1. The original and residual gas contents both involve non-desorption gas.
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