Table 1 In-situ stress test results in the Luxin mining area.

From: Distribution of in-situ stress and regional structural influence in the Luxin mining area and engineering applications

Measurement point location

H/m

σv/

MPa

σH/

MPa

σh/

MPa

Drection of maximum principal stress

Lateral pressure ratio

Difference between maximum and minimum stress/MPa

East extension of the eastern station at Luxin No.1 coal mine

301

7.53

10.97

5.6

N53.1°E

1.46

5.37

Shunting station at 5141 roadway in Luxin No.1 coal mine

338

8.46

9.18

4.8

N22.5°E

1.09

4.38

5243 return airway in Luxin No.1 coal mine

356

8.89

16.22

8.64

N8.2°W

1.82

7.58

Near borehole BK11 in the extended east roadway of Luxin No.1 coal mine

365

9.13

15.17

8.1

N78.6°E

1.66

7.07

Track dip roadway in Luxin No.1 coal mine

454

11.34

16.53

9.13

N19.8°W

1.46

7.4

N4303 transport roadway in the eastward expansion of Luxin No.2 coal mine

192

4.8

10

5.39

N27.7°W

2.08

4.61

E4303 lower roadway in Luxin No.2 coal mine

193

4.83

10

5.39

N57.16°W

2.07

4.61

Return dip airdway in the eastward expansion of Luxin No.2 coal mine

233

5.82

11.12

6.01

N31.9°E

1.91

5.11

E4203 track roadway in Luxin No.2 coal mine

248

6.19

7.38

4.2

N31.1°W

1.19

3.18

At the station of the W4203 track roadway in Luxin No.2 coal mine

267

6.67

6.49

3.3

N64.60°W

0.97

3.19

At 100 m downstream of the 4 th horizontal crosscut track dip roadway in Luxin No.2 coal mine

278

6.96

5.47

3

N70.4°E

0.79

2.47

E4205 roadway in Luxin No.2 coal mine

305

7.62

13.33

7.05

N47°W

1.75

6.28

At the end of the track dip roadway in Luxin No.2 coal mine

359

8.97

6.02

3.05

N21.4°E

0.67

2.97

Downhill extension of the conveyor belt at Luxin No.2 coal mine

369

9.23

9.5

5.17

N48.4°E

1.03

4.33

N4004 transportation roadway in Shadunzi coal mine

402

10.04

13.54

7.39

N57.4°W

1.35

6.15

North mining area loopback connection roadway in Shadunzi coal mine

413

10.33

13.69

7.09

N78.3°W

1.33

6.6

Measurement point 1 in the concentrated return airway of mining area N41 in Shadunzi coal mine

440

11.4

18.8

9.2

N23°W

1.65

9.6

Measurement point 2 in the concentrated return airway of mining area N41 in Shadunzi coal mine

450

11.7

17.3

8.8

N35°W

1.48

8.5

Measurement point in the N4107 belt roadway in Shadunzi coal mine

470

12.2

14.7

7.1

N42°W

1.20

7.6

Measurement point in the S4103 belt roadway of in Shadunzi coal mine

490

12.25

16.07

10.15

N17.6°W

1.31

5.92

Measurement point 1 in the S4103 return airway in Shadunzi coal mine

470

11.75

13.15

7.68

N36.2°W

1.12

5.47

Measurement point 2 in the S4103 return airway in Shadunzi coal mine

500

12.5

14.28

8.43

N29.5°W

1.14

5.85

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