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عمران::
منطقهی گودبرداری
Besides, with the low permeability of clay, that is, the flow velocity of groundwater in clay is small, the possibility of groundwater leaking into the excavation zone, which will cause much inconvenience during consfruction, need not be considered.
will leak into the excavation zone during excavation and cause much trouble.
1 To keep the excavation bottom dry: With the higher flow velocity of groundwater in sand or gravel, groundwater may well flow into the excavation zone, which will cause inconvenience for constriction.
Groundwater flows so slowly in clayey soils that flowing of groundwater into the excavation zone will not occur.
2 Toprevent leakage ofgroundwater or soils: To excavate in sandy or gravelly soil, with a high groundwater level, using either soldier piles or sheetpiles, which are not satisfactorily watertight, or diaphragm walls or bored piles with joints that may have defects will risk the possibility of the leaking of groundwater into the excavation zone through the retaining wall.
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