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adjacent angles of repose assess backfill bentonite borehole pump caisson California bearing ratio cavation clay coffer-dam compressed air cost cutting deep depth dewatering system diameter Diaphragm walls drainage drains drawdown economic Eductor wellpointing effects Electro-osmosis embankment equilibrium excavated faces extracted falsework fissures formation level geotextile granular material gravel ground conditions ground level ground support system groundwater conditions groundwater flows groundwater table grout header pipe Horizontal wellpointing impermeable soil installed investigation layers loads located material necessary operation particles perched water tables perforated perimeter permanent permeable soils permeable strata plant quantities of water recharge removed riser pipe sand shallow side slopes silt silty site investigation slurry soft soils soil conditions soldier pile stability steeper stratum structures suction Sump pumping suspended solids temporary Thomas Telford tion tunnel Typical usually water courses water flows water level Water lowering water movements water pressures wellpoint system