Mason by hedongchenchen

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									Utilization of Soil Moisture for Trafficability
Studies
5th Interagency Surface Dynamics


Dr. George L. Mason, PE
ERDC-GSL
Engineering Systems & Materials Division
Mobility Systems Branch
Research Engineer
George.L.Mason@us.army.mil
February 29, 2011




 US Army Corps of Engineers
Unclassified FOUO
 BUILDING STRONG®
      ERDC Mobility Research Approach
              Vehicle Field Testing           Vehicle Terrain Interaction
                                                                1       2




                                                                3       4




                                                                5       6




                                                Modeling & Simulation
       Mission Level Vehicle Evaluation




                                          2                   BUILDING STRONG®
Unclassified FOUO
        Mobility in Mountain Roads of Afghanistan




                             3            BUILDING STRONG®
Unclassified FOUO
        Mobility in Mountain Roads of Afghanistan
                                            Attributes Derived from
               Lat 35.367 Long 71.545       LIDAR

                                            1. Width
                                            2. Radius of Curvature
                                            3. Surface Roughness




                                        4               BUILDING STRONG®
Unclassified FOUO
                                      Mountain Road Analysis in Laghman
                                       25 ft Turning Radius                                            25 ft Turning Radius
                                      8.9 foot Vehicle Width                                          11.9 foot Vehicle Width




                                                                                                200
    Restricted Road Segments




                               2500
                                                                                                       Baseline RG31-A3 Width



                                                                             Restricted Turns
                                                                                                180
                               2000

                                                                                                160
                               1500

                                                                                                140
                               1000
                                                                                                120
                               500
                                                                                                100
                                  0                                                                     20          25           30            35
                                          8.9     9.9          10.9   11.9
                                                                                                      Minimum Turning Radius of Vehicle (ft)
                                                Vehicle Width (ft)


                                                                             5                                               BUILDING STRONG®
Unclassified FOUO
                    Roadway 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




                                                       Operational roads with
                                                       low risk of collapse


                                                      Factor of safety between
                                                      1 and 2, increase risk of
                                                      road collapse


                                   Severely restricted roads due to
                                   high risk of collapse

                                                                    BUILDING STRONG®
                    Cross-Country Analysis




                                 7           BUILDING STRONG®
Unclassified FOUO
     Process Diagram Soil Strength
AFWA Soil                                                                                                                     Assign Soil
Moisture GRiB                                                                      Clip Area                                  Properties


                       Convert
                    Grib to Shape
FAO Soil                                                                                                     +
Type Map
                                                                                                             =

                                                                                                                             Convert Volumetric
                                    Compute Soil Strength                                                                    Moisture
                                                                                                                             To Gravimetric
                                                                                                                             Moisture
                                                           800
                                                                                                        3 Sandy Loam
                                                           700
                                                                                                        6 Loam
                                                           600                                          9 Clay Loam

      Kilometers
                                       RCI Soil Strength




                                                           500

       0   5   10                                          400

                                                           300

                                                           200

                                                           100

                                                            0
                                                                 0%   5%   10%       15%          20%    25%           30%
                                                                              Gravimetric Moisture




                                                                                                                             BUILDING STRONG®
                    Cross-Country Analysis
                                                        Soil Moisture


     Afghanistan       Kabul
                           Jalalabad




         Kandahar

                       Pakistan


                                             MPH
                                             0-2
                                             2-5
                                             5-15
                                             15-30
                                             30+              RG31-A3             RG31-A3
                                                           Driest 30-Days       Wettest 30-Days

                                       Data attribution with SAR, LIDAR, and weather
                                       data emphasizes differences between vehicle
                                       performance
                                            9                               BUILDING STRONG®
Unclassified FOUO
         Reduction in Speed Performance due
                to Increases in Weight
                               Jalalabad, Afghanistan
                        RG31A3, Wet Slippery, Jalalabad, Afghanistan
                                    16.00R20 Live Axle
                      Baseline   +9000 lbs     +10,500 lbs +12,000 lbs   +13,500 lbs
           V10          20.2        16.0           15.2          14.5       13.8
           V50          15.6        11.9           11.3          10.5        9.6
           V80           0.0         0.0            0.0           0.0        0.0
         % NoGo          27          30             31            32         38

                    Baseline                                + 13,500 lbs




                                                10                         BUILDING STRONG®
Unclassified FOUO
Route Analysis for Farah, AF

                                             Comparison of vehicle
             Route 1 (41.4 miles)            performance over a given route
                                             larger 16.00R20 tires




                                         16.00R20        395/85R20




                                    11                     BUILDING STRONG®
Unclassified FOUO
           Testing to Define Soft-Soil Performance




   a. Map showing Duckport Test Site (upper Left).




   b. Photo of Duckport Test Site showing approximate
   boundaries.
                                                        12   BUILDING STRONG®
Unclassified FOUO
      RFI requests from Theater Gap Crossing Analysis

       HMMWV   Maxpro   LAV
GAP                                          Route Evaluation
 1
 2
 3
 4                            Restricted
 5
 6
                              Marginal
 7                            Unrestricted
 8
 9
 10
 11
 12
 13




                                                    BUILDING STRONG®
                    Questions?




                         14      BUILDING STRONG®
Unclassified FOUO

								
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