Investigation on Dewatering of a Deep Shaft in Strong Permeable Sandy Pebble Strata on the Bank of the Yellow River

Table 7

Operation scheme of pumping wells.

Stage	Number of pumping wells			Water table (m)		Excavation depth (m)	Description
	Area I	Area II	Area III	Area I	Area II
1	—	—	—	-10.0	-10.0	0.00~10.00	Excavation of F1
2	2	—	—	-18.4	-10.0	10.00~17.68
3	4	—	—	-25.6	-10.0	17.68~24.08	Excavation of F2
4	6	—	—	-32.5	-10.0	24.08~30.48	Excavation of F3
Grouting the base during the excavation of F3 with the target permeability coefficient of
5	1	6	4	-54.2	-17.4	30.48~35.50	Excavation of F4
6	1	6	12	-54.2	-20.1	35.50~36.78
7	1	6	24	-54.4	-24.1	36.78~39.00	Excavation of F5
8	1	6	40	-54.8	-28.8	39.00~42.00
9	1	6	52	-54.8	-34.2	42.00~45.10