Vs data

No.

Interpreted

Parameter

Description

Equation

Refs

0

(ft)

Layer bottom depth

1

(ft)

Layer middle depth

2

(pcf)

Unit weight

For Saturated Soil Materials:

       (kN/m3, m/s, m)

       (kN/m3, m/s, m)

Maybe et al. (2001)

Maybe et al. (2009)

3

(m/s)

Recorded shear wave velocity

4

(%)

Fines content 

5

(%)

Measured clay content

6

USCS classification

7

Friction angle

Measured or

8

(tsf)

Cohesive strength

Measured or

9

Total overburden pressure

10

Effective overburden pressure

11

Normalized shear wave velocity

,

Andrus, et al (2000)

12

Equivalent clean sand

For

For

For

Juang et al. (2002)

13

(%)

Relative density

Yi (2009)

14

(kPa)

Initial shear modulus

in kPa (ρ in t/m3)

15

(tsf)

in (psf)

16

Preconsolidation stress

For clay,

, (m/s, tsf)

Maybe et al. (2001)

For sand,

17

Overconsolidation ratio

For clay-like soil,

, (m/s, tsf)

Maybe et al. (2001)

For sand-like soil,

Maybe (2007)

18

Undrained shear strength ratio

For clay-like soil,

Maybe (2007)

19

Coefficient of lateral earth pressure at rest

Maybe & Kulhawy(1982)Mayne (2007)

20

Stress reduction coefficient

Liao & Whitman:

       , for

       , for

       , for

       , for

Liao & Whitman (1986)

NCEER/NSF (2001)

Blake:

Blake (1996)

Idriss:

       , z in ft

Idriss (1999)

21

MSF

Magnitude scaling factor

NCEER Workshop lower bound (Idriss)

NCEER Workshop up bound (Andrus & Stokoe 1997)

Yi (revised)

Yi (revised)

Sand-like soils

Clay-like soils

Boulanger & Idriss (2004b)

Boulanger & Idriss (2004b)

22

Correction for overburden pressure

,

Hynes & Olsen (1999)

       , or

Idriss & Boulanger (2004)

Yi (2009)

23

Correction for initial (static) shear stress

Idriss & Boulanger (2004)

24

Cyclic stress ratio

Seed & Idriss (1971)

25

Cyclic resistance at M=7.5

Sand-like soil:

Andrus et al (2004)

Clay-like soil: 

Boulanger & Idriss (2004b)

Clay:

       n/a (nonliquefiable)

26

FS

Factor of safety for liquefaction

27

Average cyclic shear stress

28

Average stress

29

or

Shear strain

Dry sand:

       ,

Pradel (1998) (for dry sand)

Saturated sand:

, if

                               if

, if

Yi (2009)

30

Shear modulus ratio

31

Volumetric strain

Dry sand:

Yi (2009)

Saturated sand:

31

Seismic settlement increment

Dry sand:

Saturated sand:

Pradel (1998) (for dry sand)

Zhang et al (2002)

33

Cumulated seismic settlement

34

Lateral displacement increment

Saturated sand:

Zhang et al (2004)

35

Cumulated lateral displacement

and :

Gently sloping ground without a free face:

       ,

Level ground with a free face:

       ,

Gently sloping ground with a free face:

Zhang et al (2004)