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Objective: Comparison of Earthwork volume between MiTS 1 and MiTS 2

Volume Needed Before Compact Fill:

(Before MiTS 1.11.1.1 & MiTS 2.0.40.0)

Volume Needed Before Compacted Fill = Bank Fill * [1+ (1-Soil Shrink Factor)]

(After MiTS 1.11.1.1 & MiTS 2.0.40.0)

Volume Needed Before Compacted Fill=Bank Fill/Soil Shrink Factor

Version used for testing; MiTS 1.11.6.1 & MiTS 2.1.32.0

Project file:

MiTS 1 here

MiTS 2 here

*using TIN as meshing method

*Grid size 25m2

*End area interval 10m

a) With slope

Method MiTS 1.11.6.1 MiTS 2.1.32.0
DTM 64 613.49 m3 63 298.38 m3
Grid 79 693.51 m3 64 151.88 m3
End Area 66 011.61 m3 62 104.68 m3

b) Without slope

Method MiTS 1.11.6.1 MiTS 2.1.32.0
DTM 75 021.05 m3 75 910.60 m3
Grid 79 693.51 m3 76 203.27 m3
End Area 76 627.53 m3 76 627.52 m3

c) With shrinkage or/and swell factor (with slope)

How to change shrink and swell factor

MiTS 1 here

MiTS 2 here

Shrink factor used = 0.9

 

Method MiTS 1.11.6.1 MiTS 2.1.32.0
DTM Volume needed before compacted fill, (a) = bank fill/soil shrink factor

= 59323.65 m3 / 0.9 = 65915.17 m3

Export / import = Bank cut – (a)

= (123937.14 – 65917.17) m3

= 58 021.97 m3

Volume needed before compacted fll, (a) = bank fill/soil shrink factor

= 60824.50 m3 / 0.9 = 67582.77 m3

Export / import = Bank cut – (a)

= (124122.88 – 67582.77) m3

= 56 540.10 m3

Grid Volume needed before compacted fill, (a) = bank fill/soil shrink factor

=  51998.18 m3 / 0.9 = 57775.76 m3

Export / import = Bank cut – (a)

= (131691.69 – 57775.76) m3

= 73 915.93 m3

Volume needed before compacted fill, (a) = bank fill/soil shrink factor

= 61780.40 m3 / 0.9 = 68644.89 m3

Export / import = Bank cut – (a)

= (125932.28 – 68644.89) m3

= 57 287.39 m3

End Area = 58 985.13 m3 Volume needed before compacted fill, (a) = bank fill/soil shrink factor

= 62159.74 m3 / 0.9 = 69066.37 m3

Export / import = Bank cut – (a)

= (124264.42 – 69066.37) m3

= 55 198.04 m3

CONCLUSION

  1. Generally, results between MiTS 1 and MiTS 2 may have little discrepancies ranging from 2% – 4%. And this is due to improvement on algorithm done in MiTS 2.
  2. In MiTS 1, there is some limitation when using Grid Method whereas the EW volume generated with slopes or without slopes will be the same.
  3. However, this limitation is improved in MiTS 2 Grid Method where the actual scenario will be reflected upon generating the EW volume with and without slope.