My large concrete porch settled a couple inches and I had it mudjacked. The mudjacking raised and cracked the concrete porch but I was warned of the risk of cracking by the person doing the mudjacking. The front porch settled again a year after the mudjacking so I tore out the concrete and replaced it with reinforced concrete which was attached to the house with rebar drilled into the foundation. I never had another problem with that porch.

My experience was not good with mudjacking and it didn't work for me.