Thickness between two models (measuring radially, since it is a tunnel)

3D ESPESOR Good morning I have calculated in Civil 3d the solid between two surfaces but I would need to know the thickness of the concrete radially because it is a tunnel (axis I have it inserted by an EXCEL, and if I know how to do it)

The axis and the solid are imported, I would like to make a cylinder from the axis in a radial way and be able to cut the solids to have the thicknesses

What is the axis? Is it a 3D polyline or feature line or alignment + profile? Can you upload a screenshot to better describe what the solids look like?