Table 2 Calculation results of fractal dimension.

From: Study on pore structure and adsorption properties of coal and microscopic action mechanism of outburst

Excavation distance(mm)

D1

R2

D2

R2

300 ~ 400

2.687

0.982

2.771

0.997

400 ~ 500

2.669

0.987

2.763

0.996

500 ~ 600

2.696

0.983

2.814

0.998

600 ~ 700

2.722

0.982

2.858

0.998

700 ~ 800

2.695

0.982

2.845

0.998

800 ~ 900

2.695

0.982

2.845

0.998

900 ~ 1000

2.711

0.991

2.781

0.985

1000 ~ 1100

2.728

0.989

2.813

0.972

1100 ~ 1200

2.740

0.989

2.811

0.985

1200 ~ 1300

2.737

0.990

2.814

0.987

1300 ~ 1400

2.731

0.990

2.831

0.962

1400 ~ 1500

2.732

0.991

2.843

0.971

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