603 - 5885 1250 (4 lines) info@mes100.com

How does Soil Swell and Shrink factor work in MiTS?

MiTS Earthwork user manual can refer here

Spreadsheet MiTS 1.11.1.1 vs MiTS 2.1.4.0 here

Grid Cluster information here

Volume Needed Before Compact Fill:

 

(Before MiTS 2.0.40.0)

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

(After 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

With Slope  #

Method MiTS 1.11.6.1 MiTS 2.1.32.0
DTM64 613.49 m3 63 298.38 m3
Grid79 693.51 m3 64 151.88 m3
End Area66 011.61 m3 62 104.68 m3

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

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
 

 

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 fill,

(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 are some limitation when using Grid Method whereas the EW volume generated with slope or without slope will be the same.
  3. However, this limitation is improve in MiTS 2 Grid Method where the actual scenario will be reflected upon generating the EW volume with and without slope.

Powered by BetterDocs