Investigation of Multiple Hole Grouting for Reducing Water Inrush Risk in Underground Engineering

Table 1

Classification of evaluation methods of grouting effect.

Method	Remarks
Analytical	P-Q-t curve
	Distribution of quantity of grouting injected
	Water inflow correlation
	Rate of filling with grout
Inspection of borehole	Observations
	Coring
	Permeability coefficient test
Excavation sampling	Grouting mechanism analysis
	Mechanical test
Displacement estimation	Water level predictions
	Deformation predictions
Geophysical prospecting	Gravitational prospecting
	Magnetic prospecting
	Electrical prospecting
	Seismic prospecting
	Radioactivity prospecting
	Geothermal prospecting