Influence of Different Grouting Parameters on Mechanical and Strain Energy Characteristics of Different-Length Fractured Limestone in a Coalfield North of Yellow River: A Numerical Study Based on Particle Flow Code

Table 3

Energy index value of each specimen in simulation tests.

Specimen type	Crack length (mm)	Compressive strength (MPa)	Postpeak intensity 70% points
			Energy density of absorption (KJ/m^3)	Elastic energy density (KJ/m^3)	Dissipated energy density (KJ/m^3)
Protolith		98.15	633.94	198.21	435.73
Prefabricated crack	10	69.14	343.43	158.02	185.41
	30	43.37	225.94	91.50	134.44
	50	23.86	108.25	33.49	74.76
Grouting reinforcement bodies	10	91.50	597.36	190.17	407.19
	30	65.86	290.87	91.74	199.13
	50	37.46	253.15	80.94	172.21