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GeogridBridge1.0 analyzes column-supported embankments with geosynthetic-reinforced bridging layers.
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The complete report by Filz and Smith (2006), plus all spreadsheet comments, should be read before using this workbook.
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Provide the input data in the cells with red text. The cells in blue text are the calculated results based on the input data.
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Definition sketches are provided in Figs. 1 through 5, which are located to the right.
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Guidance information for material property values is provided in the pdf document to the right.
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After providing all the proper input data, use the "Solve" button located at Cell B62.
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Project name, description, date, etc.
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Bridging Layer FillEmbankment
Fill #2		Preload
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Layer Thickness, H (ft)5,04,50,0
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Total Unit Weight, g (pcf)1351155110
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Friction Angle, f (deg)3830N/A
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Young's Modulus, E (psf)750 000300 000N/A
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Poisson's Ratio, n0,300,33N/A
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Pavement plus Traffic Surcharge Pressure, q (psf)300
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Time Available for Consolidation, t (days)60
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Allowable Post-Construction Settlement, SA (in.)2,0
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Depth to Groundwater, dw (ft)3,0
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Unit Weight of Groundwater, gw (pcf)62,4
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Exist Sand #1Exist Sand #2Clay #1Clay #2
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Layer Thickness, H (ft)3,00,020,00,0
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Total Unit Weight, g (pcf)125125100100
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Young's Modulus, E (psf)250 000250 000N/AN/A
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Poisson's Ratio, n0,330,300,350,35
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Lat. Earth Press. Coeff., K00,500,500,600,60
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Interface Frict. Angle btwn Soil and Column, d (deg)32322424
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Compression Ratio, CecN/AN/A0,2200,220
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Recompression Ratio, CerN/AN/A0,0220,022
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Coeff. of Consol., cv (ft2/day)N/AN/A0,10
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Initial Eff. Vert. Stress at Top of Layer, s'v,top (psf)N/AN/A3751127
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Preconsol. Press. at Top of Layer, pp,top (psf)N/AN/A3751127
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Initial Eff. Vert. Stress at Bottom of Layer, s'v,bot (psf)N/AN/A11271127
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Preconsol. Press. At Bottom of Layer, pp,bot (psf)N/AN/A11271127
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Reduction in Required Bridging Layer Thickness, Hb,red (ft)1,0
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Geogrid Stiffness, J (lb/ft)480 000
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Long-term, In-Service, Allowable Geogrid Strength, Sg (lb/ft)2 000
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Pile CapColumn
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Vertical Distance from Top to Bottom of Element, H (ft)0,023,0
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Column Shape (use R for round and S for square)RR
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Column Diameter or Width, dc or a (ft)5,03,0
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Young's Modulus, E (psf)6 500 0006 500 000
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Poisson's Ratio, n0,300,30
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Center-to-center spacing, s (ft)7,0
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ValueCriterion
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Clear Spacing, s - a (ft)4,3≤ 6,7
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Area Replacement Ratio at Ground Surface, as0,144≥ 0.10
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Bridging Layer Thickness, Hb (ft)5,0≥ 3,3
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Maximum differential settlement of geogrid, d (in.)115,1N/A
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Geosynthetic Strain, eg0,039≤ 0.05
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Tension in the Geosynthetic Reinforcement, Tg (lb/ft)18 717≤ 2 000
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Post-Construction Embankment Settlement, S (in.)#VALUE!≤ 2,0
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