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Barrier Technologies for Environmental Management Summary of a Workshop (1997) / Chapter Skim
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Construction of Deep Barrier Walls for Waste Containment
Pages 133-141

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From page 133...
... ~ order to encapsulate a polluted area (Figure D, the vertical cutoff wall is generally keyed in a soil layer of Tow permeability of appropriate thickness and continuity. Several technologies currently are available to construct a vertical cutoff wall: slurry walls, jet grouting, soil mixing, or grout curtains.
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From page 134...
... Hydraulic grabs are opened and closed by pistons driven by a power pack mounted on the supporting crane. The hydraulic grab can be cable suspended (Figure 3)
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From page 135...
... -KELLY BAR '9-1 SL'SPEXSIO~' CABLES St'SPEXSIO~' ~AR! Fly =LLY GUIDE | MOLLY BAR po\\'ERs PACK -KELLY GUIDE - ^'DRAU,LIC HOSES 'D~AULIC GRAB en TELESCOPIC STRUT i-;-~ -; ~ FIGURE 4 Kelly-mounted hydraulic grab.
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From page 136...
... The following factors have to be considered: lithe choice of the cement type. In general, better performance, in terms of water tightness and chemical resistance, is obtained using blast-fu~nace or pozzolan cement instead of Portland cement (Figure 54.
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From page 137...
... Typically, the HDPE is lowered in the trench in sheets Tom 7- to 25-feet wide. Since the density of the membrane is Tower than the density of the self-hardening slurry, a special heavyweight guide frame is used to ensure a proper installation.
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From page 138...
... Cutoff Wall Constructed With Plastic Concrete For the excavation of very deep cutoff walls, typically over 100-150 feet, or in special circumstances, like the presence of rock or hard layers, cutoff walls can be excavated finder bentonite slurry with the Hydromill equipment. The excavation is subsequently backfilled with plastic concrete, i.e., a mix of coarse aggregate, sand, cement, and bentonite slurry that can be designed to achieve very low permeability, usually In the range of 10-7 cm/s.
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From page 139...
... . I 1 ~ l - ~ ~1 _ _ _desanding 1' _ _ 1 _ contaminated F ' slurry L, - \~ ~ FIGURE 9 Hydromill excavation - Bentonite slurry flow chart.
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From page 140...
... Procedes et outillages, Symposium sur Technologie et organization de lt execution des parois moulees dans la construction d'ouvrages hydrauliques, Sofia, Bulgaria.
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From page 141...
... 1984. -L'experience italienne dans le domaine des parois souples d'etancheite, Symposium sur Technologie et organization de I' execution des parois moulees dans la construction d'ouvrages hydrauTiques, Sofia, Bulgaria.
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Key Terms

  • hydraulic conductivity
  • waste containment
  • kelly bar
  • vertical cutoff
  • engineering division

  • barrier walls
  • hydraulic grabs
  • water tightness
  • plastic concrete
  • bentonite slurry

  • hdpe sheets
  • deep barrier
  • des parois
  • hydromill equipment
  • execution des

  • sur technologie
  • specialty conference
  • composite cutoff
  • symposium sur
  • slurry walls

  • main frame
  • walls constructed
  • geotechnical engineering
  • conference geoenvironment
  • parois moulees

  • moulees dans
  • cement content
  • monitored constantly
  • hydromill trenching
  • contact surface


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