A structure that prevents trench walls from collapsing is known as

Shoring is the structure that prevents trench walls from collapsing. It involves temporarily supporting a building, structure, vessel, or trench with shores when in danger of collapse or during repairs or alterations. It is used during the repair or original construction of buildings and in excavations. For example these supports may required for the relieve the load on a masonry wall while it is repaired or reinforced.