  We review, as well as provide some new results regarding the study of the
structure of spacetime and the singularity in the interior of the Schwarzschild
black hole in both loop quantum gravity and generalized uncertainty principle
approaches, using congruences and their associated expansion scalar and the
Raychaudhuri equation. We reaffirm previous results that in loop quantum
gravity, in all three major schemes of polymer quantization, the expansion
scalar, Raychaudhuri equation and the Kretschmann scalar remain finite
everywhere in the interior. In the context of the eneralized uncertainty
principle, we show that only two of the four models we study lead to similar
results. These two models have the property that their algebra is modified by
configuration variables rather than the momenta.
