671017.pdf

60 75 90 105

1

10

100

1000

0.517(0.000)

0.514(0.002)

0.474(0.028)

0.444(0.048)

=13,000kPa

M easured Predicted

Sr(%)

sc

(kPa)

e(p)

(a)

60 75 90 105

0. 1

10

1000

100000

sc

(kPa)

Sr(%)

(p)= 0. 0

(p)= 0. 048

(b)

Figure 4: Effect of plastic volumetric strain on soil-water characteristic curve (data after Vanapalli et al. (1999) [ 33 ]).

1 10 100 1000

2. 10


3. 16


4. 22


5. 28
   sc= 500 10kPa

pnet=10kPa

pnet= 100kPa

sc(kPa)

(a)

1

pnet=10kPa

pnet= 100kPa

sc(kPa)

10 100 1000

0. 4


1. 6


2. 8


3. 0

Sr

(b)

Figure 5: Model prediction for wetting tests at different net stresses: (a) relation between mean net stress and specific volume; (b) soil-water
characteristic curve. It is assumed here that푏DR^0 = 290kPa,푏WT^0 =30kPa,푆irr푟 = 0.3,푑^0 DR=푑^0 WT= 1.0,훼DR= 3500kPa,훼WT= 1500kPa,
푟 = 6.5,푚 = 0.012,and휀푝V,max= 0.25.

As an example,Figure 4(a)illustrates the effect of the
plastic volumetric strain on the soil-water characteristic
curve. The datum points are inferred from the experimental
results in [ 33 ].Itcanbeseenthat,whilethetheoretical
simulations agree reasonably well with the experimental
results,themodeliscapableofcapturingthemainfeaturesof
theSWCCofdeformablesoils.Theeffectofplasticvolumetric
deformation on capillary hysteresis is schematically shown in
Figure 4(b).

2.7. Evaluation of Constitutive Parameters.The proposed

model avoids using the LC yield curve as in the traditional

framework and introduces the matric suction and degree

of saturation into the hardening function as independent

variables. The constitutive parameters can be divided into the

following three groups.

(1) Group 1: conventional constitutive parameters—휆,휅,

푀,and퐺.