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CarriagewayVerge A1 Southbound
mOD
54
56
58
60
62
64
66
A1 Morpeth Bypass - Slope Failure Remediation
C02/023 Figure 2Mar 2002
Typical Cross Section - TT6
68
70
Stiff sandyclay with siltbands and
gravel
Densegravellysand
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50
CarriagewayVerge A1 Northbound
mOD
52
54
56
58
60
62
64
66
A1 Morpeth Bypass - Slope Failure Remediation
C02/023 Figure 2Apr 2002
Typical Cross Section - TT3
Stiff sandyclay with siltbands and
gravel
Densegravellysand
Densesandy
silt
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50
CarriagewayVerge A1 Northbound
mOD
52
54
56
58
60
62
64
66
A1 Morpeth Bypass - Slope Failure Remediation
C02/023 Figure 2Apr 2002
Typical Cross Section - TT3
Stiff sandyclay with siltbands and
gravel
Densegravellysand
Densesandy
silt
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50
mOD
52
54
56
58
60
62
64
66
A1 Morpeth Bypass - Slope Failure Remediation
C02/023 Figure 3Apr 2002
Typical SLOPE Design Section - TT3
7
1112
13
10 17
2
1
8
94
515
14
3
6
16
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50
mOD
52
54
56
58
60
62
64
66
A1 Morpeth Bypass - Slope Failure Remediation
C02/023 Figure 4Apr 2002
Two Part Wedge Design Section - TT3
1
23
2'
3'
1'
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A1 Morpeth Bypass - Slope Failure Remediation
C02/023 Figure 5Apr 2002
Two Part Wedge Design - Dimensions - TT3
θ1
θ2
W
de
f
Y
X
b
a
H
m
k
Z
g
B
θ1
θ2
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A1 Morpeth BypassAppendix ASlope Failure Remediation
Two Part Wedge AnalysisSlope Section TT3 - Whole Slope
Soil PropertiesSlope Geometry
kN/m320.00Unit wtm11.75Hdeg32.00Peak ø'm9.75Wdeg22.00Design ø'm13.00XkPa0.00Design c'm2.00YkPa100Cum13.50Z
kPa5Surchargedeg26.2648Slopedeg20Inclination of nailsdeg35.8377Angle t1
deg8.7462Angle t2
Computed ForcesComputed Dimensions
kN739.5W1m5.3349akN574.0W2m4.4151bkN182.4U1m1.9420dkN116.1U2m3.3168ekN0.0K1m13.3359fkN0.0K216.6527gkN13.4Q1m2.6889k
m13.1529m
kN255.8T11.0Sliding factor
kN-90.5T2kN165.4T total
1.17Inclination factor
Total ForcekN/m run193to be provided
by soil nails
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Nail Geometry
mm in clays100Grouted Diameterm7.0Lengthm2.0Spacingmm32Bar diameterkN230Bar Capacity
Soil Nail Capacities Based on Peak Effective Stress ParametersAnchor PullAverageLeFace PullAverageLfRowOut ForceDepthOut ForceDepth
kNmmmm291.9844.88850.7872.1121413.3054.33281.0642.6682474.1083.775131.2883.2253424.3323.219171.5123.7814374.5562.663231.7364.3375314.7812.107291.9614.8936245.0051.550372.1855.4507544.5013.627161.4563.3738674.0065.33840.7601.6629743.3886.66900.1430.33110
Total Force1.20Average KskN/m run223provided by
soil nails
Soil Nail Capacities Based on Undrained Shear StrengthAnchor PullShaftLeFace PullShaftLfRowOut ForceFrictionOut ForceFriction
kNkPamkPam77504.88833502.112168504.33242502.668259503.77551503.225351503.21959503.781442502.66368504.337533502.10777504.893624501.5586505.45757503.62753503.373884505.33826501.6629
105506.6695500.33110
Total ForcekPa100Design CukN/m run300provided by0.5Adhesion factor
soil nails
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50
CarriagewayVerge A1 Northbound
mOD
52
54
56
58
60
62
64
66
A1 Morpeth Bypass - Slope Failure Remediation
C02/023 Figure 2Apr 2002
Typical Cross Section - TT3
Stiff sandyclay with siltbands and
gravel
Densegravellysand
7m long soil Nails installed at 2m horizontal centresin ten rows at 2.482m horizontal spacing.
Slope drains at 10m centres to be a minimumof 1.5m deep with a 150mm slotted pipe beddedin clean Type B filter material contained in suitablegeotextile filter membrane. Alternate drains halfheight only.
Slope protection and support provided by MacMat-Rthree dimensional geomat and steel mesh compositematerial pinned to the slope by the soil nails.
Densesandy
silt
Soil nails drilled at 20° to horizontal except forlower three rows. Rows 1 and 2 to be drilled at30° and row 3 at 25° to the horizontal.
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A1 Morpeth Bypass - Slope Failure Remediation
C02/023 Figure 1Apr 2002
Layout Plan - TT3
N0m 20m
Soil nails installed at 2m horizontal centres ona grid line with a horizontal radius of 1,651.76m.Nine/ten parallel rows at 2.482m horizontalspacing. All nails 7m long.
filter membrane. Drains assumed 0.5m wide.B filter material contained in suitable geotextilewith a 150mm slotted pipe bedded in clean TypeAll slope drains to be a minimum of 1.5m deep
Total number of soil nails - 285 number
A1 Northbound Carriageway
R1
,65
1.7
62
1. 3
1.3
22
. 3
2.3
19
.91
.5