microreinforced soil with short polypropylene fibres
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8/13/2019 Microreinforced soil with short polypropylene fibres
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FullFull--scale experimentscale experiment
Microreinforced soil with short polypropylene fibres
Isabel FalorcaIsabel Falorca
ifalorca@ubi.ptifalorca@ubi.pt
Isabel PintoIsabel Pinto
isabelmp@dec.uc.ptisabelmp@dec.uc.pt
Ferreira GomesFerreira Gomes
lmfg@ubi.ptlmfg@ubi.pt
8/13/2019 Microreinforced soil with short polypropylene fibres
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Summary
Introduction
Site characterization
Laboratory experiment
Full-scale experiment conception
Full-scale experiment construction
Earthwork quality control
Conclusion
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Introduction
The optimal mixture of soil and small size reinforcing
elements randomly oriented constitutes a 3D soil reinforcingsystem, designated by Microreinforced soil.
Reinforcing elements can have a variety of forms and can
be made of synthetic or natural material.
* Roots
* Mesh elements
* Fibrillated fibres
* Continuous filaments
* Short fibres
* Recycling materials
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Developed Microreinforced soil Techniques.
* TEXSOL (France)
0.1 to 0.2 %
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Developed Microreinforced soil Techniques.
* mesh-elements (England)
0.1 to 0.2 %
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Research Project running at Portugal.
Randomly oriented short polypropylene fibres
showed to be a
very promising soil reinforcement technique to improve the
shear strength and bearing capacity of soils with no reduction in
its permeability.
Fibre percentage ≤ 1%
Fibre length ≤ 100 mm
Fibre diameter ≤ 0.05 mm
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Research Project running at Portugal.
The project comprises two main phases:
Only the field experiment phase will be describedthe field experiment phase will be described,
particularly the main full-scale experiment.
an extensive laboratory experiment conducted to
determine the influence of numerous variables
on the behaviour of fibre reinforced soil;
two full-scale experiments to validate the behaviourof fibre reinforced soil under static and dynamicloads;
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Ground investigation
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Ground investigation
Preliminary ground investigationto establish the general stratigraphy
to establish the depth of bed-rock
to define major anomalies
Detailed ground investigation
.
Preliminary ground investigationto establish the general stratigraphy
to establish the depth of bed-rock
to define major anomalies
.
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Site characterization
Ground investigation
Preliminary ground investigationto establish the general stratigraphy
to establish the depth of bed-rock
to define major anomalies
Detailed ground investigation
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Site characterization
SM – wellgraded sand
with gravel
and silt
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Laboratory tests
Selection of thecompaction method
soil (SM)
reinforced soil
(SM05F6d)
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Laboratory tests
Selection of thecompaction method
Heavy Proctor
compaction test
15.0
16.0
17.0
18.0
19.0
20.0
5 7 9 11 13 15 17 19
Water content (%)
D r y u n i t w e
i g h t ( k N / m 3 )
.
SM
SM05F6d
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Laboratory tests
Selection of thecompaction method
Heavy Proctor
compaction test
Vibration
compaction test
Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
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Laboratory tests
Selection of thecompaction method
Heavy Proctor
compaction test
Vibration
compaction test
15.0
16.0
17.0
18.0
19.0
20.0
5 7 9 11 13 15 17 19
Water content (%)
D r y u n i t w e i g h t ( k N / m 3 )
.
SM
SM05F6d
Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Laboratory tests
Selection of thecompaction method
Effect of fibres on
behaviour of soil
Heavy Proctor
compaction test
Vibration
compaction test
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
16.0
18.0
20.0
5 7 9 11 13 15 17 19 Water content (%)
D r y u n i t w
e i g h t ( k N / m 3 )
.
SMSM05F6d
SM05F15d
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Full-scale experiment construction
► to collect information about full-scale mixingtechniques
►
to study the behaviour of material under static
and dynamic loads
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Before construction
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
ConclusionSite preparation
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Levelling adjustment and
test sections boundary
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Fibres
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Spreading the selected fibres byhand
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
First mixing experiment
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Selected procedure for fibres and
soil placement
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Mixing with a recycler type mixer
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Thickness and levellingmeasurements of each layer
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Compaction stage
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Final construction stage
Good
weather
Finished
On
Schedule
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Earthwork quality control
The following quality control procedures were applied during
full-scale experiment construction:
thickness and levelling measurements of each
layer;
sampling and inspections to check the fibrepercentage;
monitoring the compaction quality
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Earthwork quality control
0.80
0.90
1.00
1.10
1.20
-6 -4 -2 0 2 4 6
w-wopt (%)
SM SM
SM05F6d SM05F6d
SM05F15d SM05F15dmáx
situin
d
d
γ
γ
uclear moisture- Water replacement
density gauge: method test:
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Earthwork quality control
0.80
0.90
1.00
1.10
1.20
-6 -4 -2 0 2 4 6
w-wopt (%)
SM SM
SM05F6d SM05F6d
SM05F15d SM05F15dmáx
situin
d
d
γ
γ
uclear moisture- Water replacement
density gauge: method test:
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Earthwork quality control
0.80
0.90
1.00
1.10
1.20
-6 -4 -2 0 2 4 6
w-wopt (%)
SM SM
SM05F6d SM05F6d
SM05F15d SM05F15dmáx
situin
d
d
γ
γ
uclear moisture- Water replacement
density gauge: method test:
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Earthwork quality control
Visual inspections
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Conclusion (1/2)
Short polypropylene fibres as soil reinforcement has shown
to be a very promising soil reinforcement technique;
Polypropylene fibre reinforced soil at field experiment
generally supported the findings of laboratory experiment:
by spreading uniformly the fibers and the soil, layer by layer
until all the moist soil and fibers have been added, followed
by a slight mixing by hand, the mixture was achieved with
more facility;
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Introduction
Site
Laboratory tests
Conception
Construction
Quality control
Conclusion
Conclusion (2/2)
The compaction equipment should produce significant
localized deformations to compact the fibre reinforced soil;
Some visual acceptance criterions in conventional
earthwork compaction quality control proved to be
inadequate for fibre reinforced soil;
The final conclusions of this research will be reached only
after the completion of tests that are running (dynamic
impact tests, plate loading tests and field permeability tests).
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THANK YOUTHANK YOU
Isabel FalorcaIsabel Falorca
ifalorca@ubi.ptifalorca@ubi.pt
Isabel PintoIsabel Pinto
isabelmp@dec.uc.ptisabelmp@dec.uc.pt
Ferreira GomesFerreira Gomes
lmfg@ubi.ptlmfg@ubi.pt
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