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

Table 2

Proportion of water yield and volume of grout injected.

Aquifer	Water exit points		Water yield (m^3/h)			Volume of grout injected (tons)
	No.	Proportion (%)	Water yield	Proportion (%)	Single hole	Volume of grout	Proportion (%)	Single hole
L8	191	55.04	5134	47.20	26.9	8816	45.26	114.5
L10	133	38.33	4966	45.66	37.3	9229	47.38	124.7
L11	23	6.63	777	7.14	33.8	1432	7.35	79.6
Total	347	100.00	10877	100.00	31.3	19476.4	100.00	115.2