The Mechanical and Fracturing of Rockburst in Tunnel and Its Acoustic Emission Characteristics

Table 3

Accumulation AE energy and precursor time for different horizontal stress.

Horizontal stress; (kN)	Accumulation AE energy; (E10 × aJ)	Relative time of precursor
100	4.82	0.90
200	6.56	0.89
300	9.39	0.86