APPENDIX3CALCULATIONFORSETTLEMENTOFSHALLOWFOUNDATIONUSINGHOUGH'SMETHOD
FoundationDimensions
4.00 m 300 kPa4.20 m 0 m4.20 m
SoilStrataandProperties
DensityFrom To (kN/m 3 )
0 0.00 4.00 10 1 4.00 6.00 10 30 652 6.00 7.50 10 100 1003 7.50
9.00 10 100 1004 9.00 15.00 10 100 1005
Settlement()isgivenby
Increaseinverticalstress(v)duetotheappliedloadatanydepthzbelowthefoundation
zisdepthtocentreoflayerfromfoundinglevel
H Dm z ' v0 ' v (m) (m) (m) (kPa) (kPa) (mm)
1 2.00 5 1 50.00 195.7 212 1.50 6.75 2.75 67.5 109.6 63 1.50 8.3
4.25 82.50 74.1 44 6.00 12 8 120.00 35.6 7
38
Estimatedtotalsettlement= 38 mm
Structure MNB RepresentativeBoreholeBH1
HighlyWeatheredRock
DepthbelowGL(D) Netbearingpressure(q)Length(L)
DepthofGWTbelowGLWidth(B)
Layer DepthbelowGL SoilType SPTN C 'sandyclaySandyclay
CompletelyWeatheredRockHighlyWeatheredRock
visincreaseinverticalstress
Layer
TotalSettlement
C'istheBearingCapacityIndexwhichisafunctionofsoiltypeandSPTNvalue'v0istheinsitueffectiveverticalstress
0
0 )(log1
v
vvC C
CH
)()( zBzLLBq
v
