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Proposed Specifications for LRFD Soil-Nailing Design and Construction (2011) / Chapter Skim
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Pages 72-73

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From page 72...
... of mesh reinforcement in the wall facing, in the vertical direction in the mid-span between soil nail heads avn = Cross-sectional area (per unit width) of mesh reinforcement in the wall facing, in the vertical direction over the soil nail heads C = Coefficient used for the estimation of the soil nail wall displacement CF = Factor that considers non-uniform soil pressures behind a soil nail wall facing and is used in the estimation of nominal resistances at the soil nail head CP = Factor that accounts for soil contribution to support and is used in the estimation of nominal resistances at the soil nail head D′c = Effective, equivalent diameter of the potential slip conical failure in the facing around soil nail heads DDEF = Horizontal distance behind soil nail wall where ground deformation can be significant DDH = Average diameter of soil nail drill-hole DE = Effective diameter of the core of a threaded anchor DH = Diameter of the head of a soil nail head connector (i.e., headed-stud)
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From page 73...
... at soil nail head NH = Number of headed-studs in soil nail head connection nt = Number of threads per unit length in threaded anchor (i.e., bolt) qU = Nominal bond resistance of soil nails RFF = Nominal resistance for flexure in facing RFH = Nominal resistance for tension of headed-studs located in facing RFP = Nominal resistance for punching-shear in facing RPO = Nominal pullout resistance of soil nails rPO = Nominal pullout resistance per unit length of soil nails RT = Nominal resistance of a soil nail bar in tension SH = Horizontal spacing of soil nails SHS = Spacing of headed-studs SV = Vertical spacing of soil nails tH = Head thickness of headed-studs Tmax = Maximum load in a soil nail To = Maximum load in the head of a soil nail tP = Thickness of bearing plate VF = Punching-shear force acting through facing, around soil nail head α = Angle of batter of soil nail wall β = Backslope angle δh = Horizontal displacement at the top of a soil nail wall δv = Vertical displacement at the top of a soil nail wall φFF = Resistance factor for flexure in facing φFH = Resistance factor for facing headed-stud in tension φFP = Resistance factor for punching-shear in facing φPO = Resistance factor for nail pullout φT = Resistance factor for nail bar in tension γs = Unit weight of soil ρij = Reinforcement ratio in "i" direction (vertical or horizontal)
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Key Terms

  • nail head
  • soil nails
  • nail heads
  • resistance factor
  • nominal resistance

  • nail bar
  • unit length
  • pullout resistance
  • additional reinforcement
  • mesh reinforcement

  • bearing plate
  • nominal pullout
  • nails rpo
  • nominal resistances
  • maximum load

  • horizontal direction
  • unit width
  • threaded anchor
  • vertical direction
  • force acting

  • ground deformation
  • head connector
  • heads ahh
  • facing rfp
  • vertical spacing

  • bond resistance
  • soil contribution
  • effective diameter
  • heads avn
  • heads ddef


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