Numerical Simulation and Optimization of Hole Spacing for Cement Grouting in Rocks

Table 4

Probability of distance in each grouting stage with the permeability rate less than 1 Lu.

Different confidence	Distance from the drilling center/m
	Stage 1	Stage 2	Stage 3	Stage 4	Stage 5	Stage 6	Stage 7	Stage 8	Stage 9	Stage 10
100%	2.8	1.6	1.3	1.3	1.0	1.0	1.2	1.1	0.9	1.2
95%	2.9	1.6	1.3	1.4	1.5	1.2	1.2	1.1	1.1	1.2
90%	3.0	1.6	1.4	1.4	1.5	1.2	1.2	1.2	1.1	1.2
80%	3.0	1.6	1.4	1.4	1.5	1.2	1.3	1.2	1.2	1.3
Mean	3.261	1.728	1.453	1.450	1.660	1.351	1.402	1.357	1.247	1.337