Research on Rock Burst Control Mechanism of Deep Buried Tunnel Using Surrounding Rock Modification Theory

Table 1

Characteristics of in situ stress and rock strength.

Borehole no.#	Area	(MPa)	(MPa)	(MPa)	(MPa)		Barton criterion
1	Rhyolite in strong structural damage area	20.12	12.83	10.21	30.12	1.49
2	Andesite in substrong structural damage area	32.45	23.78	33.35	69.51	2.14
3	Rhyolite in weak structural damage area	33.32	23.45	36.12	122.36	3.67
4	Rhyolite in weak structural damage area	16.12	13.22	23.12	86.31	3.73