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BS1377 : Part 6 : Clause 3 : 1990Determination of Consolidation Properties in a Hydraulic Cell

Borehole No RCS03 Description:Sample No CS Hard dark grey CLAY / SILTDepth 40.50 m

SAMPLE DETAILSDepth within original sample 20mm from top of coreOrientation within original sample VerticalSample preparation UndisturbedCondition and quality of sample GoodRemarks on specimen preparation No difficulties

TEST DETAILSApparatus used Hydraulic consolidation cell of 76mm nominal diameterCell preparation Check performed in accordance with Clause 3.2.6Type of loading Equal StrainDrainage conditions One-way VerticalPore pressure measurement location Centre of base

INITIAL CONDITIONSDiameter mm 76.2Height mm 18.6Moisture content % 36Bulk density Mg/m³ 1.85Dry density Mg/m³ 1.37Particle Density Mg/m³ 2.65 AssumedVoids Ratio 0.938

SATURATIONMethod Back pressure assistedPressure used 50kPa increments, 10kPa differentialVolume of water taken in mL 3.6Final diaphram pressure kPa 300Final pore pressure kPa 280Final B value 1.00Duration days 2

UNDRAINED LOADING / UNLOADINGStage number 1 2 3 4 5 6Stage type loading loading loading loading unloading unloadingDiaphragm pressure kPa 400 500 700 1100 500 400Settlement mm 0.00 0.01 0.02 0.03 -0.05 -0.01Pore pressure increase kPa 98 102 197 374 -283 -106

CONSOLIDATION (drained loading/unloading)Back pressure kPa 300 300 300 300 300 300Effective stress at end of stage kPa 100 200 400 800 200 100Voids ratio at end of stage 0.919 0.897 0.871 0.845 0.866 0.878Pore pressure dissipation at end of stage % 100 100 100 100 100 100Coeffiecient of Volume Compressibility m²/MN 0.098 0.115 0.068 0.034 0.018 0.068Coeffiicient of Consolidation m²/year 136 202 260 192 76 775Method for deriving Cv log time log time log time log time log time log timeDuration days 1 1 1 1 1 1

FINAL CONDITIONSWet density Mg/m³ 1.91Moisture content % 36

NOTES

Checked and Project Number:

Approved GEO / 11876Initials: Project Name: GEOLABS

CFW N6 GCOB MentoDate: 29/08/07

Test Report by GEOLABS Limited Bucknalls Lane, Garston, Watford, Hertfordshire, WD2 7JR (Ref3323.463970) of 1Authorised Signatories: � J R Masters (Qual Mgr) [X] C F W allace (Tech Mgr) � G J Corio (Tech Mgr) © GEOLABS LIMITEDClient: K4 Testing, Unit D, Belvue House, Belvue Road, Northolt, Middlesex UB5 5QJ


Borehole No RCS03 Description:Sample No CS Hard dark grey CLAY / SILTDepth 40.50 m




Test Report by GEOLABS Limited Bucknalls Lane, Garston, Watford, Hertfordshire, WD2 7JR (Ref3323.463970) Page 1 of 1Authorised Signatories: � J R Masters (Qual Mgr) [X] C F W allace (Tech Mgr) � G J Corio (Tech Mgr) © GEOLABS LIMITEDClient: K4 Testing, Unit D, Belvue House, Belvue Road, Northolt, Middlesex UB5 5QJ

10 100 10000.84

0.86

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Effective Pressure (kPa)

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Borehole No RCS03Sample No CS Stage No 1 Effective Stress = 100 kPaDepth 40.50 m




Test Report by GEOLABS Limited Bucknalls Lane, Garston, Watford, Hertfordshire, WD2 7JR (Ref3323.466655) Page 1 of 1Authorised Signatories: � J R Masters (Qual Mgr) [X] C F Wallace (Tech Mgr) � G J Corio (Tech Mgr) © GEOLABS LIMITEDClient: K4 Testing, Unit D, Belvue House, Belvue Road, Northolt, Middlesex UB5 5QJ

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bs1377 : part 6 : clause 3 : 1990 determination of ... · determination of consolidation properties...

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