This document contains multiple paragraphs describing soil permeability tests and calculations involving soil properties like dry mass, porosity, coefficient of permeability, effective stress, and water content at different depths and elevations. It also includes descriptions of soil samples, test setups, and requests to make calculations and plot values based on given soil cylinder dimensions and water head values.

1.  A permeabilitytestwasrunona compactedsample of dirtysandygravel.The sample was
150 mmlongand the diameter of the mold150 mm In83 s the discharge undera
constantheadof 40 cm was 392 cm3. The sample hada drymass of 5300 g and itsp, was
2680 kg/cm3. Calculate (a) the coefficientof permeability,(b) the seepage velocity,and
(c) the discharge velocityduringthe test.
 You have justbeenplacedincharge of a small soilslaboratoryandthere isa tightbudget
for permeabilityequipment.Make adecisionasto whattype of equipmentyouwould
orderso as to performlaboratorytestsonthe widestrange of soils.
 A falling-headpermeabilitytestona specimenof fine sand16 cm2 in areaand 9 cm long
gave a k of 7 x 10 cm/s.The dry massof the sandspecimenwas210 g and itsp was 2.68
Mg/m3. The testtemperature was26°C. Compute the coefficient of permeabilityof the
sand fora voidratio of 0.70 andthe standardtemperature of 20°C. (AfterA.Casagrande)
 Soil boringsmade ata site nearChicagoindicate thatthe top 6 m isa loose sandand
miscellaneousfill,withthe groundwatertable at3 m below the groundsurface.Below
thisisa fairlysoftblue-graysiltyclaywithanaverage watercontentof 30%. The Boring
was terminatedat16 m Below the groundsurface whena fairlystiff siltyclaywas
encountered.Make reasonable assumptionsastosoil propertiesandcalculate the total,
neutral,andeffectivestressesat3,6,11 and 16 m below the groundsurface.
 Sand issupportedona porousdiscand screeninvertical cylinder,asshowninFig.P7-19.
these are equilibriumconditions.
Case IV Assume thatthe sandis fine enoughtoremain100% saturatedupto its top
surface by capillarity.
 Given,the soil cylinderandtest setupof Example 7.11, withactual dimensionsasfollows:
AB = 5 cm, BC = 10 cm, CD = 10 cm, and DE = 5 cm. Calculate the pressure,elevation,and
total headsat pointsA throughE in centimetresof water,andplotthese valuesversus
elevation.
 Assume the soil of Fig.7.10. has a saturateddensityof 1.94 Mg/m If the headof water h
above elevationBis2.34 m, compute the effectivestressatelevationA atthe bottomof
the soil sample duringflow.Whatisthe effective stressunderthese conditionsat
midheightinthe soil column duringsteady-stateflow?