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

Table 1

Acoustic wave velocity and the permeability rate of drilling holes before grouting.

Grout stage	Stage 1	Stage 2	Stage 3	Stage 4	Stage 5	Stage 6	Stage 7	Stage 8	Stage 9	Stage 10
Drilling hole/m	5.5–10.5	−15.5	−20.5	−25.5	−30.5	−35.5	−40.5	−45.5	−50.5	−55.6
Wave velocity/m/s	5140	5119	4629	4565	5077	4994	5061	5053	4816	4756
Permeability rate/Lu	9.94	11.61	10.66	8.33	11.15	8.36	7.17	9.82	9.2	5.56