Movements - Geotechnical Investigation and Design Tables - page 299

Table 23.10 Tolerable strains for reinforced slopes and embankments (Duncan and Wright, 2005).

Reinforced Considerations Tolerable

application strains, tol (%)

ε

Reinforced soil 10

walls
Reinforced

Embankments on firm foundation 10

slopes
Reinforced

On non sensitive clay, moderate crest deformation tolerable 10

embankments On non sensitive clay, moderate crest deformation not tolerable 5-6

On highly sensitive clays 2-3

23.11 Movements in inclinometers
•

The loading from the embankment results in a lateral movement.

Table 23.11 Relative movements below embankment.

Measurement Symbols/relationship

Horizontal movement

δ

H

Vertical movement δ v

Inclinometer at side of embankment on soft clay 0.3

δ /δ

v

∼

H

23.12 Acceptable movement in highway bridges
•

The movement criteria for bridges stated below do not consider the type or size
of bridge.

Table 23.12 Movement criteria for bridges (Barker at al., 1992,
Moulton et al., 1978, Bozozuk, 1978).

Movement criteria Acceptable movement (mm)

Vertical Horizontal

Not harmful

<

50

<

25

Ride quality affected 60

Harmful but tolerable 100-50 50-25

Usually intolerable 100 50

> >

23.13 Acceptable angular distortion for highway bridges
•

Angular Distortion (A) = δ /S:

- - Differential settlement between foundations.

δ

- S - Span length.