sob, The usual specification is to make sure there are not rocks in the trench under your pipe, usually one places a compacted sand bed then you backfill your pipe with non-expansive soil(non-organic)and compact the backfill around and over the pipe. This is to keep unnecessary stresses off the pipe and keep the pipe in place. The pipe will actually float up if the area is saturated when the pipe is not full. You can omit the sand bed but it makes the trench bottom level to support the full pipe length. GL JMHO Aloha

Hello, I just replaced my 24 foot round above-ground-style pool with a new one. The pool is on a hill and therefore semi-inground - one side is above ground, the other side only has about a foot and a half out of the ground. The new installer didn't backfill around the pool and said I should install plywood around the inground portion before doing so, which the previous pool didn't have but I think is a good idea now. My questions are: do I install the plywood to span the support beams (e.g. distributing the pressure of the ground onto the support beams rather than the steel sides)? I think that makes the most sense, since if I just installed it against the pool and backfilled with dirt on both sides it doesn't seem to me that it would offer much protection? Any help or suggestions are appreciated. Thanks, Bill

It will be fine, we do it all the time for future bathrooms.

The simple answer to your simple question is NO,your house will not break,split or shatter as result of digging beneath it. Compact soil as the hole is being refilled.