Earth Reinforcement Combined with Other Method - Case ...Earth Reinforcement Combined with Other...
Transcript of Earth Reinforcement Combined with Other Method - Case ...Earth Reinforcement Combined with Other...
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Earth Reinforcement Combined with Other Method
- Case History -
Yoshihisa MIYATANational Defense Academy
Japanese Supporting Committee for TC9
1st meeting of TC9 (2002-2005), Nice, September 23, 2002
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How to Spread The Application Field?
• One of Current Task of Earth Reinforcement Technique ---
“ How to Spread The Application Field”
• Course of our research ---“ Development of New Ability “
or“ Improvement of Technical Reliability “
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Reinforced Soil Wall
Reinforced Embankment
Nailing Reinforced Foundation
Combination with Other Method
Other Geotechnical MethodsSoil Mixing, EPS, and Preloading + Prestressing etc.
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Reinforced Soil Wall (RSW)Combined with Other Method
Ex.1 RSW with Cement & Short Fiber MixingCement & Short Fiber MixingEx.2 RSW with EPS BlocksEPS BlocksEx.3 RSW with Foam Grass MixingFoam Grass MixingEx.4 RSW with Preloading + PrestressingPreloading + PrestressingEx.5 RSW with Deep Mixing and GroutingDeep Mixing and Grouting
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Ex.1 RSW with Cement & Fiber Mixing
2.0m
1.0m 2.7m0.7m
6.0m
0.3m
0.8m
GeogridTmax = 35kN/m
Fill materialc = 0 kN/m2
φ= 30 deg
c = 210 kN/m2
φ= 0 deg
Improved soil (soil / cement / short fiber)
From Dr. T.Hirai (Mitsui Chemicals Industrial Products Co. Ltd.)
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Ex.1 RSW with Cement & Fiber Mixing
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RC Slab
RC Slab
Cover soil
Sand
Tie bar
From Mr. T.Konami (Okasan Livic Co. Ltd)
EPS Blocks
Ex.2 RSW with EPS Blocks
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Ex.2 RSW with EPS Blocks
EPS Blocks
RC slab
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Ex.3 RSW with Foam Glass Mixing
Improved soil(recycled foam glass/ soil)φ = 41 degc = 20kN/m2
γt = 1.1 kN/m3
From Mr. T.Konami (Okasan Livic Co. Ltd)
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Ex.3 RSW with Foam Glass Mixing
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Foam Glass
Soil
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Tie rods
From Mr. T.Uchimura (Univ. of Tokyo)
Ex.4 RSW with Preloading + Prestressing
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Ex.4 RSW with Preloading + Prestressing
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Ex.5 RSW with Deep Mixing and Grouting
From Dr. N.Kotake (Toyo Construction Co. Ltd)
Deep Mixing Zone
Jet Grouting Zone
Soft Soil
Reinforced soil wall
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Ex.5 RSW with Deep Mixing and Grouting
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Reinforced Embankment (RE)Combined with Other Method
Ex.6 RE with PLPS and DrainagePLPS and DrainageEx.7 RE with Impact AbsorbersImpact Absorbers
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Ex.6 RE with PLPS + Drainage
From Mr. Y.Yokota (Maeda-Kosen Co. Ltd)
Scale : 40m in height, Fill: cohesive soils
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Ex.6 RE with PLPS + Drainage
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Ex.7 RE with Impact Absorbers
Impact Transmission Bags
Sandy SoilGeogrid
Impact Catch Bags
Protect Matt
From Mr. Y.Yokota (Maeda-Kosen Co. Ltd)
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Ex.7 RE with Impact Absorbers
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Nailing Combined with Other Method
Ex.8 Nailing with Deep MixingDeep MixingEx.9 Nailing with Fiber Reinforced SoilFiber Reinforced SoilEx.10 Nailing with Ring ReinforcementRing Reinforcement
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DAGSIMφ60㎜
Deep Mixing
Ex.8 Nailing with Deep Mixing
From Mr. Y.Otani (Hirose Co. Ltd)
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Ex.8 Nailing with Deep Mixing
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Ex.9 Nailing with Cement & Fiber Mixing
Deteriorated shotcrete
Void filling
Repeated grouting type anchor
Propylite
( L=3.0m )
From Dr. H.Wada (Raito Kogyo Co. Ltd)
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In the middle of constructionBe
fore
con
stru
ctio
nAfter construction
Ex.9 Nailing with Cement & Fiber Mixing
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Ex.10 Nailing with Ring Reinforcement
From Mr. K.Ogata (Research Institute of Japan Highway Public Co.)
pierStep. 1
Step. 2 Step. 3
Step. 4
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Ex.10 Nailing with Ring Reinforcement
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Reinforced Foundation (RF) Combined with Other Method
Ex.11 RF with PilesPilesEx.12 RF with Deep Mixing
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Ex.11 RF with Piles
From Mr. T.Konami (Okasan Livic Co. Ltd) Reference/ Jones, Lawson and Ayres(1990): Geotextile reinforced piled embankments, Geotextile, Geomembranes and related products, Den Hoedt (ed.), Balkema, Rotterdam, pp.155-160.
Pile
Sand
SoftClay
Fill Material
Strip type geosynthetics
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Ex.11 RF with Piles
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1.2m
2.0m10.25m
5.5m
2.5m
Soft Clay
Geogrid W = 8m
3.7m5.
0m
6.1m
Ex.12 RF with Deep Mixing
From Dr. T.Hirai (Mitsui Chemicals Industrial Products Co. Ltd.)
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Ex.12 RF with Deep Mixing
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Combination method & ICG 2002
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Several related papers are included in the conference proceedings.
Some related sessions will be organized.
-- Reinforced Embankment on piles
(chaired by Prof. Jones and Prof. Lawson)
and so on.
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SUMMARY
• Earth reinforcement combined with the other method was focused, and 12 case histories were introduced.
• The introduced technique has new ability, however combined techniques are very traditional each other.