US Army Corps of Engineers BUILDING STRONG ® Utilization of Soil Moisture for Trafficability...
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US Army Corps of Engineers BUILDING STRONG ® Utilization of Soil Moisture for Trafficability Studies 5 th Interagency Surface Dynamics Dr. George L. Mason, PE ERDC-GSL Engineering Systems & Materials Division Mobility Systems Branch Research Engineer [email protected] February 29, 2011 Unclassified FOUO
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Transcript of US Army Corps of Engineers BUILDING STRONG ® Utilization of Soil Moisture for Trafficability...
US Army Corps of Engineers
BUILDING STRONG®
Utilization of Soil Moisture for Trafficability Studies
5th Interagency Surface Dynamics
Dr. George L. Mason, PE
ERDC-GSL
Engineering Systems & Materials Division
Mobility Systems BranchResearch Engineer
February 29, 2011
Unclassified FOUO
BUILDING STRONG®
ERDC Mobility Research ApproachVehicle Field Testing Vehicle Terrain Interaction
6 5
4 3
2 1
Modeling & SimulationMission Level Vehicle Evaluation
Unclassified FOUO2
BUILDING STRONG®Unclassified FOUO
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Mobility in Mountain Roads of Afghanistan
BUILDING STRONG®Unclassified FOUO
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Mobility in Mountain Roads of Afghanistan
Attributes Derived from LIDAR
1.Width2.Radius of Curvature3.Surface Roughness
Lat 35.367 Long 71.545
BUILDING STRONG®
Mountain Road Analysis in Laghman
25 ft Turning Radius8.9 foot Vehicle Width
25 ft Turning Radius11.9 foot Vehicle Width
Baseline RG31-A3 Width
5Unclassified FOUO
BUILDING STRONG®
Severely restricted roads due to high risk of collapse
Operational roads with low risk of collapse
Factor of safety between 1 and 2, increase risk of road collapse
A table for rapid assessment of road capacity was created from model runs . The table is considered for inclusion in safety cards and training for MTV drivers.
Criteria color coding defined by ERDC SME Panel
Roadway Collapse
BUILDING STRONG®
Cross-Country Analysis
7Unclassified FOUO
BUILDING STRONG®
Process Diagram Soil StrengthAFWA Soil Moisture GRiB
ConvertGrib to Shape
Clip Area
FAO Soil Type Map
Compute Soil Strength
Convert Volumetric MoistureTo Gravimetric Moisture
+
=
0
100
200
300
400
500
600
700
800
0% 5% 10% 15% 20% 25% 30%Gravimetric Moisture
RC
I S
oil
Str
eng
th
3 Sandy Loam
6 Loam
9 Clay Loam
Assign SoilProperties
0 5 10
Kilometers
BUILDING STRONG®
MPH 0-2 2-5 5-1515-3030+
Afghanistan
Pakistan
Kabul
Kandahar
Data attribution with SAR, LIDAR, and weather data emphasizes differences between vehicle performance
Cross-Country Analysis Soil Moisture
RG31-A3Wettest 30-Days
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Jalalabad
RG31-A3Driest 30-Days
Unclassified FOUO
BUILDING STRONG®
Reduction in Speed Performance due to Increases in Weight
Jalalabad, Afghanistan
10Unclassified FOUO
Baseline + 13,500 lbs
Baseline +9000 lbs +10,500 lbs +12,000 lbs +13,500 lbsV10 20.2 16.0 15.2 14.5 13.8V50 15.6 11.9 11.3 10.5 9.6V80 0.0 0.0 0.0 0.0 0.0
% NoGo 27 30 31 32 38
RG31A3, Wet Slippery, Jalalabad, Afghanistan16.00R20 Live Axle
BUILDING STRONG®
Route Analysis for Farah, AF
Route 1 (41.4 miles)
Comparison of vehicle performance over a given route larger 16.00R20 tires
11Unclassified FOUO
16.00R20 395/85R20
BUILDING STRONG®
a. Map showing Duckport Test Site (upper Left).
b. Photo of Duckport Test Site showing approximate boundaries.
Testing to Define Soft-Soil Performance
12Unclassified FOUO
BUILDING STRONG®
RFI requests from Theater Gap Crossing Analysis
GAP123456789
10111213
HMMWV Maxpro LAV Route Evaluation
RestrictedMarginalUnrestricted
BUILDING STRONG®
Questions?
Unclassified FOUO14
