Dewatering From Wikipedia, the free encyclopedia
/diːˈwɔːtərɪŋ/)) is the removal of water of water from from solid material or soil by wet Dewatering (pronounced /diːˈwɔːtərɪŋ/ classification, centrifugation centrifugation,, filtration filtration,, or similar solid-liquid separation processes, processes, such as removal of residual liquid from a filter cake by a filter press as part of various industrial processes. Construction dewatering, unwatering, or water control are common terms used to describe removal or draining groundwater or surface water from a riverbed riverbed,, construction site, site, caisson caisson,, or mine or mine shaft, shaft, by pumping or evaporation. On a construction site, this dewatering may be implemented before subsurface excavation for foundations, shoring, or cellar space to lower the water table. table. This frequently involves the use of submersible "dewatering" pumps pumps,, centrifugal ("trash") pumps, eductors, "dewatering" by electro osmosis, or application of vacuum of vacuum to well points. Contents
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1 Dewatering by deep wells 2 Dewatering by wellpoints 3 Dewatering by horizontal drainage 4 Control of pore pressures 5 Waste dewatering 6 See also 7 References 8 Further reading
[edit edit]]Dewatering
by deep wells
A deep well typically consists of a borehole fitted with a slotted liner and an electric submersible pump. As water is pumped from a deep well, a hydraulic gradient is formed and water flows into the well forming a cone of depression around the well in which there is little or no water remaining in the pore spaces of the −3
surrounding soil. Deep wells work best in soils with a permeability of k = 10
of drawdown of drawdown that a well can achieve is limited only by the size of the pump. pump.
−5
m/s to 10
m/s; the amount
[1]
Deep wells can be installed in a ring around an excavation to lower the water level and maintain a safe, dry site. Several equations can be used to design deep well dewatering systems, however many of these are based on empirical data and occasionally fail. Practice and experience, along with a firm understanding of the underlying principles of dewatering, are the best tools for designing a successful system. system. situations "are so common that they can be designed almost by rule of thumb". thumb".[3]
[2]
Some dewatering
Deep wells are also used for aquifer testing and for groundwater drainage by wells.
[edit]Dewatering
[4]
by wellpoints
Wellpoints are small-diameter (about 50 mm) tubes with slots near the bottom that are inserted into the ground from which water is drawn by a vacuum generated by a dewatering pump. Wellpoints are typically installed at close centers in a line along or around the edge of an excavation. As a vacuum is limited to 0 bar, the height to which water can be drawn is limited to about 6 meters (in practice).
[5]
Wellpoints can be installed in stages, with
the first reducing the water level by up to five meters, and a second stage, installed at a lower level, lowering it further.The water trickling between the deep wells may be collected by a single row of well point at the toe. This method ensures a much thicker width free from seepage forces.
[edit]Dewatering
by horizontal drainage
The installation of horizontal dewatering systems is relatively easy. A trencher installs first an unperformed pipe followed by a synthetic or organic wrapped perforated pipe. The drain length is determined by the drain diameter, soil-conditions and the water table. In general drain lengths of 50 meter is common. After installation of the drainpipe a pump is connected to the drain and water can be pumped out. After the water table has been lowered the intended construction can start. After the construction is finished the pumps are stopped and the water table will rise again. Installation depths up to 6 meter are common.
[edit]Control
of pore pressures
Whilst engineers can use dewatering to lower a groundwater table, or to drain soils, they can also use the process to control pore pressure in soils and avoid damage to structures by base heave. High pore pressures occur in soils composed of fine silts or clays. Since these soils have a very low permeability, dewatering in a traditional sense (gravity flow into an abstraction well) may prove very costly or even futile. Instead, a vacuumassisted dewatering scheme, such as ejector wells, or vacuum-sealed deep wells may serve to draw water into a well for abstraction.
[edit]Waste
[6]
dewatering
