Soil model with out intended resistivity values
Soil model with out intended resistivity values
(OP)
Normally as most earthing design practitioners take the resistivity values before excavating for the earthing mash. But in our case the site is already excavated for the said purpose and the resistivity data is available further bellow that level. So can any one recommend a technique which we don't have to back fill the site to calculate the resistivity values and excavate it again to lay the mesh? Some of my pals are talking of extrapolation but still it won't represent the actual thing as the error is quite high.






RE: Soil model with out intended resistivity values
If you will fill the site with the excavated soil, then assume that the fill will be the same resistivity as the measured upper layer.
RE: Soil model with out intended resistivity values
RE: Soil model with out intended resistivity values
Hence, it can be benificial to use resistivity values taken before excavation.
RE: Soil model with out intended resistivity values
RE: Soil model with out intended resistivity values
If the excavated soil is replaced and the backfill is compacted, then I'd say you could keep the 2-layer model but add 10 meters to the top layer. If the soil is replaced without compacting, then you might want to increase the resistivity and use a 3-layer model. Why do you excavate 10 meters and replace the soil? If you do not compact, won't you worry about settlement in the future?