Numerical Simulation Study on Influence of a Structural Parameter of D Bolt, an Energy-Absorbing Rock Bolt, on its Stress Distribution

Table 2

Axial stresses of segments in each rock bolt, Pa.

Types of rock bolt	Number of segments	Number of bolts
		№ 1	№ 2	№ 3	№ 4	№ 5
For fully encapsulated rebar bolt (displacement of 0.03008 m)	1	1.5E + 10	2.25E + 10	2.25E + 10	2.25E + 10	2.25E + 10
	2	2.25E + 10	3.3E + 10	3.3E + 10	3.3E + 10	3.3E + 10
	3	3.1E + 10	3.3E + 10	3.3E + 10	3.3E + 10	3.3E + 10
	4	2.25E + 10	2.3E + 10	2.3E + 10	2.25E + 10	2.25E + 10
For D bolt with anchors spaced evenly (displacement of 0.049 m)	1	2.1E + 09	2.3E + 09	1.7E + 09	1.6E + 09	1.6E + 09
	2	3.2E + 09	2.8E + 09	2.8E + 09	2.7E + 09	2.7E + 09
	3	3.4E + 09	3.2E + 09	3.2E + 09	3.3E + 09	3.3E + 09
	4	1.8E + 09	2.3E + 09	2.3E + 09	2.25E + 09	2.25E + 09