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

Table 2

Simulation results in each grouting stage.

Grouting stage		Stage 1	Stage 2	Stage 3	Stage 4	Stage 5	Stage 6	Stage 7	Stage 8	Stage 9	Stage 10
Pressure/Pa	Simulation	2.46	2.83	3.08	3.38	3.99	4.67	5.02	5.13	5.07	4.23
	Measurement	2.51	2.88	3.13	3.43	4.04	4.72	5.07	5.18	5.07	5.08
	Difference %	−2.0	−1.7	−1.6	−1.5	−1.2	−1.1	−1.0	−1.0	0.0	−16.7
Grout amount/L	Simulation	1839	2466	3193	3110	1748	1513	1554	2110	1755	735
	Measurement	2674	2982	2493	2509	2674	2515	2451	1121	2732	2513
	Difference %	−31.2	−17.3	28.0	24.0	−34.6	−39.8	−36.6	88.2	−35.8	−70.8
Injection cement content/kg	Simulation	2082	2831	3766	3643	2003	1696	1734	2438	2005	627
	Measurement	2267	2592	2015	2069	2263	2042	1950	393	2320	1787
	Difference %	−8.1	9.2	86.9	76.1	−11.5	−16.9	−11.1	519.7	−13.6	−64.9