The Stability Evaluation of Shaft during Drastic Drawdown Dewatering of Alluvium

Table 1

Duncan–Zhang model parameters.

Serial no.	Lithology	Buried depth (m)	Density (g·cm^−3)	K	Kur	Rf	Kb	m	Cohesion C	Internal friction angle φ0	∆φ	Lateral pressure coefficient K0	Horizontal permeability coefficient Kns	Vertical permeability coefficient Kvs	Initial void ratio e0
1	Topsoil	11	1.86	200	300	0.8	800	0.1	2	22	3.2	0.67	0.00021	0.00021	0.7
2	Silt	30	2.2	300	450	0.8	1200	0.1	0	22	3.2	0.67	0.0161	0.0161	0.75
3	Sandy clay	39	2.2	400	600	0.75	1600	0.2	3	30	1.3	0.4	0.00021	0.00021	0.7
4	Fine sand	56	2.1	500	750	0.8	2000	0.1	0	0	3.2	0.67	0.0161	0.0161	0.75
5	Clay 1	93	2.1	430	645	0.75	1720	0.2	5	22	1.3	0.4	0.00021	0.00021	0.7
6	Sand	128	2.1	700	1050	0.85	2800	0.3	0	30	3.2	0.4	0.0161	0.0161	0.75
7	Clay 2	219	2.2	800	1200	0.75	3200	0.6	5	22	5	0.6	0.00021	0.00021	0.7
8	Gravel	251	2.04	600	900	0.95	2400	0.21	0	30	1.3	0.42	2.536	2.536	0.8