Study on Rockburst Nucleation Process of Deep-Buried Tunnels Based on Microseismic Monitoring

Table 1

Strata physical and mechanical properties for the Jinping project.

	Elastic modulus/Gpa	Poisson ratio	Friction angle/°	Cohesion/MPa	Weight; /m^3	Uniaxial compressive strength/MPa
Baishan group marble	18.9	0.23	25.8	15.6	27.5	86
Yantang group marble	17.0	0.22	26.7	13.2	27.1	70
Sandstone and slate in upper Triassic	12.0	0.30	25.9	10.1	27.4	114
Chlorite schist	6.53	0.32	36.0	2.6	27.2	79
Zagunao group marble	17.0	0.22	26.7	13.2	27.1	78