Assertion: prefabricated reinforced concrete lining | /r/ObjectUse | used in weak clay and sand soils
Facets:
value: thus,
type: OTHER
value: effectively
type: MANNER
Source sentences:
text: In weak clay and sand soils (particularly in the construction of shallow tunnels), prefabricated reinforced-concrete lining that is compressed by the rock can be used effectively; thus, the rock mass and the lining work together to prevent settling of the upper soil layers.