"Thou detestable maw, thou womb of death,/ Gorg'd with the dearest morsel of the earth,/ Thus I enforce thy rotten jaws to open,/ And in despite I'll cram thee with more food." (V.iii.45-49)
Paradoxical image of the "womb of death", as "womb" is associated with life. Therefore, this image acts as an inversion- there is no life, only death.
"I enforce..." is a powerful command, that seems to be violating the body of the tomb.
Semantic field of the dismembered body, "maw", "womb", "death", is a subversion of Petrarchan love poetry, which focuses on body parts of the object of desire.