Table 1 Total testing (right-, left- and new are right-hand thread, left-hand threaded and new bolt, bury depth unit: m).

From: Anchorage performance of a new rebar bolt under different surrounding rock strength and borehole depth

 

Soft coal

Hard coal

Rock

0.5

1.0

1.5

2.0

0.6

1.2

1.8

0.8

1.2

2.0

Right-

2

2

2

2

–

–

–

2

2

1

Left-

–

–

–

–

2

2

1

–

–

–

New

2

2

2

1

2

2

1

1

2

2

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