Sulphate reducing bacteria will pit SS fairly rapidly. Volcanic soils can also be a problem. Elec conductivity and the presence or potential for stray current from earthing systems should be evaluated.
You may find the following of some use:
Thermal Resistivity of Soil
1- Silica at 27 ºC k = 1.3 W/m.ºC, then the Resistivity = 0.77 ºC.m/W
[ 3-263 Perry’s Chemical Engineering Handbook]
2- Soil at 27 ºC k = 0.52 W/m.ºC, then the Resistivity = 1.92 ºC.m/W
[ 3-263 Perry’s...
Barry,
I suggest that you check out the support conditions for the pipe arches and the potential for movement of the fill between and supporting the arches. I suspect for the heavily loaded situation you are looking at minor variations in field performance and control of the backfill and the...
There is another issue here that does not appear to have been considered; that is the moisture content of the soil at the time of compaction and its relationship to the M/C at max dry density for either std or modified Proctor Compaction. For low moisture content soils, particularly those dry...
