DQS252 WEEK 4

Basement can minimise the floor space available in a building without using extra land

• True

• False

Belows are the common risks during basement construction EXCEPT:

• obstruction of existing services

• reduction in the risk of damaging ground movement

• boundary issues

• poor ground conditions

Deep basement can be constructed using traditional ways such as cut and fill (open cut method) or top down method.

• True

• False

Open cut arrangement is a simplest and most straightforward method of arrangement.

• True

• False

If the work of excavation is beyond ______ deep, it is uneconomical for open cut method.

• 4m

• 8m

• 6m

• 5m

The main disadvantage of open cut method is the large amount of free site space required to construct the slope.

• True

• False

Diaphragm Wall, Contiguous Bored Pile Wall and ________ are the example of permanent retaining wall.

• soldier pile

• secant pile wall

• laffing walls

• sheet pile

Shoring should be provided for any excavation that is more than _____ deep.

• 1.60m

• 1.50m

• 1.80m

• 2.0m

Excavation for top down method proceeds without the need for strutting to support the excavation as the slabs act as the permanent horizontal supports.

• True

• False

Diaphragm wall is underground structural elements commonly used for retention systems and temporary foundation wall.

• True

• False