Model Tests on the Antibreaking Countermeasures for Tunnel Lining Across Stick-Slip Faults

Table 4

Basic mechanical parameters of similar materials of surrounding rock.

Parameters		Elastic modulus (MPa)	Bulk density (kN·m^−3)	Cohesive force (kPa)	Internal friction angle (°)
Grade IVsurrounding rock	Prototype	1550∼3300	20∼23	240∼650	27∼39
	Similar materials	42.6	14.6	7.4	30.3
Grade Vsurrounding rock	Prototype	1400∼2000	17∼20	20∼200	20∼27
	Similar materials	30.2	12.7	3.2	24.6