A Study of the Anchorage Body Fracture Evolution and the Energy Dissipation Rule: Comparison between Tensioned Rock Bolts and Torqued Rock Bolts

Table 6

Comparison of the stress and fractures in the anchorage body.

	Group 1	Group 2	Group 3	Rate of change
Peak strength	5.1 MPa	5.4 MPa	5.8 MPa	5.9%
				13.7%
Quantity of the shearing fractures	1068	887	800	–16.9%
				–25.1%
Quantity of tensile fractures	116	146	95	25.8%
				–18.1%
Total damaging extent	52.4%	47.9%	43.7%	–8.6%
				–16.6%
Shearing damaging extent	47.7%	41.6%	39.4%	–12.8%
				–17.4%
Tensile damaging extent	4.7%	6.3%	4.3%	34.0%
				–8.5%