Attached is a spreadsheet to classify the soil according to USCS and the granulometric curve is plotted by sieving.

Please upload any improvements done to this file and post if any mistakes are found or if you have any suggestions.

This is the original code.
USCS1.sm (101,6 KiB) descargado 1847 vez(es).

This is the original code with another particle-size distribution
USCS.sm (103,17 KiB) descargado 2233 vez(es).

Below in another post it is updated with a better presentation of the granulometric curve.

Fit & explorer ... Jean

USCS fit Granulometry.sm (21,61 KiB) descargado 1772 vez(es).

Wrote

Fit & explorer ... Jean

USCS fit Granulometry.sm (21,61 KiB) descargado 1772 vez(es).

Thank you so much,

I added the logistic sigmoid function you made to the initial code and it compare with and without the fit. In addition to the initial curve, I graphed it using the Zed Graph, where it can be better appreciated using a semilogx graph

USCS-fit-Granulometry.sm (175,97 KiB) descargado 1665 vez(es).

Wrote

Thank you so much,

Thanks as well, very educative.
A large suite of math codes added
Cheers ... Jean.

Project USCS fit Granulometry.sm (90,24 KiB) descargado 1771 vez(es).