Contents preface (VII) introduction 1—37

Vo

H

^Vo

K

= 0.343

Using these values and Hilf’s equation, one obtains

F

∆V12

I

G

J ^pob

^Vo

^∆^u12

= –

H

K

F

∆V12

I

G

J

+ nob (1 − Sob + Sob H)

Vo

H

K

F

I

∆V

14.77 G

12

J

Vo

= –

H

K

∆V

12

+ 0.343 (1 − 0 . 853 + 0 . 853 × 0 . 02)

Vo

F

I

∆V

14.77 G

12

J

= –

H

Vo

K

.

∆V

12

+ 0.056

Vo

EMBANKMENT DAMS									521
	One can now compute ∆u12 and prepare the following table :
	∆V					∆V12			∆u12	Pore pressure	σ′	σ
	Vo					Vo
(%)		=		∆V			−	^∆^V1b		(w.r.t. 1b as origin)	(w.r.t. initial pore pr.)
		V			V
					o					o
			=	∆V			– 0.0323	(N/cm^2)	= u1b + ∆u12 (N/cm^2)	(N/cm^2)	(N/cm^2)
				Vo
3.23		0								0	4.47	25.53	30.00
4.0			0.0077				2.35	6.82	40.00	46.82
4.5			0.0127				4.33	8.80	54.50	63.30
4.65		0.0142				5.02	9.49	60.61	70.00

The values of ∆u₁₂ are shown plotted in Fig. 15.23 from 1b to 2b. Using this figure, a plot of u versus σ can be prepared, Fig. 15.24.

30
			=	u
20
u(N/cm ^2)								2
10								2b
				1b
0	10	20		30	40	50	60	70
					(N/cm^2)