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

Table 1

Strata property parameters.

Strata	Cohesion	Friction angle	Density	Void ratio	Deformation modulus	Permeability coefficient
	(kPa)	(°)	(g/cm^3)		(MPa)	(×10^-4m/s)
1-1 miscellaneous fill	0	12	1.71	—	5	0.58~0.93
2-1 loess soil	19	24.7	1.66	0.84	—	0.35~0.58
2-6 medium sand	0	30.0	1.90	—	12	2.3~2.90
2-10 pebble	0	35.0	2.17	0.282	45	6.60~7.41
3-11 pebble	15	43.0	2.28	0.288	50	5.79~6.37