Groundwater Inrush Control and Parameters Optimization of Curtain Grouting Reinforcement for the Jingzhai Tunnel

Table 2

Mechanical parameters.

Lithology	Rock mass parameters						Joint parameters
	Density (kg/m^3)	(GPa)	(GPa)	(MPa)		(MPa)	(MPa)	(MPa)	(KPa)
Carbonaceous slate	2550	13.3	8.4	13.3	31	2.2	2.31	0.56	42.11	23
Grouting carbonaceous slate	2550	13.3	8.4	13.3	31	2.2	5.12	1.27	96.22	33