How stable (generally speaking) are floor slabs that have been jackhammered up to replace sewer lines and then repaired? Is it best not to re-do the floor with ceramic tile and instead pick a material that's easier to re-re-do if he floor settles -such a vinyl tile, sheet vinyl, or laminate?
In particular, I have the case of 1958 vintage slab that's about 5 inches thick with steel mesh reinforcement. Obviously one should compact the earth that's replaced before pouring concrete over it. As to using reinforcement in the repair, I haven't found examples of people doing that. The soil being excavated is moist - probably from the sewer leak and/or from a previous owner irrigating a planter along the front wall of the house by flooding it.