Finish TradesCâu 269 / 700
A landscape retaining wall holds back soil. To relieve water pressure that could push the wall over, the builder should provide:
a.A smooth impermeable back with no drainage
b.Extra soil piled against the wall face
c.Weep holes and/or a gravel drainage layer with a drain behind the wall
d.A taller wall only
Giải thích
Retaining walls need drainage (weep holes, gravel backfill, and often a perforated drain) so hydrostatic pressure from trapped water does not build up and overturn the wall. An impermeable back traps water, piling soil adds load, and simply building taller does not relieve water pressure.
Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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