1 of 2 PRELIMINARY GEOTECHNICAL INVESTIGATION REPORT PROPOSED MULTI-SPECIALITY/ SUPER SPECIALITY HOSPITAL UNDER NON-BRGF AT KALNA Date : 14/10/2014 ALLOWABLE BEARING PRESSURE CALCULATION Shallow Foundation (a) Bearing Capacity Analysis for shallow foundation The net ultimate bearing capacity (q ult ) of shallow footings as per I.S.Code (I.S.6403-1981) is given by the equation: q ult =C u .N c .s c .d c .i c +s(N q -1)s q .i q .d q +(1/2)B.γ.N γ .s γ .d γ .i γ .W / qult = Cu.Nc.sc.dc.ic {For φ=0,Cohesive Soil} where Nc =5.14 (For, φ =0) N c ,N q ,N γ = Bearing capacity factors (As per I.S.6403-1981) s c , s q ,s γ = Shape factor. d c ,d q ,d γ = Depth factor. i c , i q , i γ = inclination factor. γ = Bulk unit weight of sub-soil. W / = Correction factor to account for the effect of water table. σ = Effective surcharge at the base level of foundation. B = Width of footings L = Length of footings D f = Depth of foundation C u = Undrained shear strength (From Laboratory Test) N = SPT Values related to consistency of Clay Soil φ = phi (From Field / Laboratory Test)
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1 of 2
PRELIMINARY GEOTECHNICAL INVESTIGATION REPORT
PROPOSED
MULTI-SPECIALITY/ SUPER SPECIALITY HOSPITAL
UNDER NON-BRGF
AT KALNA
Date : 14/10/2014
ALLOWABLE BEARING PRESSURE CALCULATION
Shallow Foundation
(a) Bearing Capacity Analysis for shallow foundation
The net ultimate bearing capacity (qult) of shallow footings as per I.S.Code (I.S.6403-1981) is given by the equation:
Nc,Nq,Nγ= Bearing capacity factors (As per I.S.6403-1981)
sc, sq,sγ = Shape factor.
dc,dq,dγ = Depth factor.
ic , iq, iγ = inclination factor.
γ = Bulk unit weight of sub-soil.
W/= Correction factor to account for the effect of water table.
σ = Effective surcharge at the base level of foundation.
B = Width of footings
L = Length of footings
Df = Depth of foundation
Cu = Undrained shear strength (From Laboratory Test)
N = SPT Values related to consistency of Clay Soil
φ = phi (From Field / Laboratory Test)
2 of 2
(b) Settlement for shallow foundation
Settlement=Immediate Settlement +Consolidation Settlement Sf = Si +Sc Si = qnet B*{[1- µ
2]/Es}*If
qnet = Net foundation pressure/Intensity of contact pressure B = Width of footing Es = Undrained Modulus of elasticity of soil µ = Poisson’s Ratio of soil If = Influence coefficient, a function of ratio of length to width of footing=1.12
Sc = mv. ∆p.H. mv= Coefficient of volume change/compressibility.
∆p = Pressure increment due to foundation loading =(LXBXP)/{(L+H/2)(B+H/2)}. H = Thickness of the stratum.
(c) Data Required & Obtained from Laboratory & Field Test Results
Cu = 3.00 T/m2
γ = 1.80 T/m3
φ = 0 0
Allowable Bearing Pressure
Sl.No.
Types of Footing Footing Size
(m x m)
Depth of footing
below E.G.L. (m)
Net Safe Bearing
Capacity (T/m2)
Allowable Bearing Pressure ((T/m2)
Max. Permissible Settlement(mm)
1 Square 1.2 X 1.2 1.5 10.02 10.0 75
2 Square 1.5 X 1.5 1.5 9.62 9.6 75
3 Square 2.0 X 2.0 1.5 9.22 9.2 75
4 Square 2.5 X 2.5 1.5 8.98 9.0 75
5 Square 3.0 X 3.0 1.5 8.82 8.8 75
6 Rectangular 1.5 X 2.5 1.5 8.29 8.3 75
7 Rectangular 2.0 X 3.0 1.5 8.04 8.0 75
8 Rectangular 2.5 X 3.0 1.5 8.06 8.1 75
9 Strip (L/B < 5) 1.5 m wide 1.5 7.70 7.7 75
10 Strip (L/B < 5) 2.0 m wide 1.5 7.38 7.4 75
11 Strip (L/B < 5) 2.5 m wide 1.5 7.18 7.2 75
12 Strip (L/B < 5) 3.0 m wide 1.5 7.06 7.1 75
40 m 27.09.2014
0.5 m 28.09.2014
Fro
m
To
0-1
5 c
m
15
-30
cm
30
-45
cm
N'
Va
lue
0.00
DS 0.50
DS 1.00
SPT 1.50 1.95 2 2 2 4
UDS 2.00
2.50
SPT 3.00 3.45 2 2 3 5
UDS 3.50
B.H.NO : 01
Method of Boring : Shell & Auger Ground Elevation: E.G.L.
Site: Kalna Sub-Divisional Hospital, Kalna ,Dist-Burdwan
GEOTECHNICAL INVESTIGATION FOR PLANNING, DESIGN AND EXECUTION OF MULTI-SPECIALITY/
SUPERSPECIALITY HOSPITAL UNDER NON-BRGF
SHEET NO : 1 of 3
BORELOGAs per IS: 1892:2002
DESCRIPTION
Diameter of Boring : 150 mm Depth of Borehole : Date of Commencement :
Date of Completion : Depth of Casing : -Water Stuck : 4.5 m Depth of Casing : - Date of Completion : 02.05.2014
Nc,Nq,Nγ= Bearing capacity factors (As per I.S.6403-1981)
sc, sq,sγ = Shape factor.
dc,dq,dγ = Depth factor.
ic , iq, iγ = inclination factor.
γ = Bulk unit weight of sub-soil.
W/= Correction factor to account for the effect of water table.
σ = Effective surcharge at the base level of foundation.
B = Width of footings
L = Length of footings
Df = Depth of foundation
Cu = Undrained shear strength (From Laboratory Test)
N = SPT Values related to consistency of Clay Soil
φ = phi (From Field / Laboratory Test)
2 of 2
(b) Settlement for shallow foundation
Settlement=Immediate Settlement +Consolidation Settlement Sf = Si +Sc Si = qnet B*{[1- µ
2]/Es}*If
qnet = Net foundation pressure/Intensity of contact pressure B = Width of footing Es = Undrained Modulus of elasticity of soil µ = Poisson’s Ratio of soil If = Influence coefficient, a function of ratio of length to width of footing=1.12
Sc = mv. ∆p.H. mv= Coefficient of volume change/compressibility.
∆p = Pressure increment due to foundation loading =(LXBXP)/{(L+H/2)(B+H/2)}. H = Thickness of the stratum.
(c) Data Required & Obtained from Laboratory & Field Test Results
Cu = 2.90 T/m2
γ = 1.80 T/m3
φ = 0 0
Allowable Bearing Pressure
Sl.No.
Types of Footing Footing Size
(m x m)
Depth of footing
below E.G.L. (m)
Net Safe Bearing
Capacity (T/m2)
Allowable Bearing Pressure ((T/m2)
Max. Permissible Settlement(mm)
1 Square 1.2 X 1.2 1.5 9.69 9.7 75
2 Square 1.5 X 1.5 1.5 9.30 9.3 75
3 Square 2.0 X 2.0 1.5 8.91 8.9 75
4 Square 2.5 X 2.5 1.5 8.68 8.7 75
5 Square 3.0 X 3.0 1.5 8.53 8.5 75
6 Rectangular 1.5 X 2.5 1.5 8.01 8.0 75
7 Rectangular 2.0 X 3.0 1.5 7.77 7.8 75
8 Rectangular 2.5 X 3.0 1.5 7.79 7.8 75
9 Strip (L/B < 5) 1.5 m wide 1.5 7.44 7.4 75
10 Strip (L/B < 5) 2.0 m wide 1.5 7.13 7.1 75
11 Strip (L/B < 5) 2.5 m wide 1.5 6.94 6.9 75
12 Strip (L/B < 5) 3.0 m wide 1.5 6.82 6.8 75
40 m 07.09.2014
1.0 m 08.09.2014
Fro
m
To
0-1
5 c
m
15
-30
cm
30
-45
cm
N'
Va
lue
0.00
DS 0.50
DS 1.00
SPT 1.50 1.95 1 1 2 3
UDS 2.00
2.50
SPT 3.00 3.45 1 2 2 4
UDS 3.50
Diameter of Boring : 150 mm Depth of Borehole : Date of Commencement :
Date of Completion : Depth of Casing : -Water Stuck : 4.5 m Depth of Casing : - Date of Completion : 02.05.2014
Ty
pe
SAMPLE DETAILS
Th
ick
ne
ss/D
ep
t
h o
f La
ye
r(m
)
DEPTH(M) SPT: No Blows
B.H.NO : 01
Method of Boring : Shell & Auger Ground Elevation: E.G.L.
Site: Serampore Sub-Divisional Hospital, Hooghly, West Bengal
GEOTECHNICAL INVESTIGATION FOR PLANNING, DESIGN AND EXECUTION OF MULTI-SPECIALITY/
Nc,Nq,Nγ= Bearing capacity factors (As per I.S.6403-1981)
sc, sq,sγ = Shape factor.
dc,dq,dγ = Depth factor.
ic , iq, iγ = inclination factor.
γ = Bulk unit weight of sub-soil.
W/= Correction factor to account for the effect of water table.
σ = Effective surcharge at the base level of foundation.
B = Width of footings
L = Length of footings
Df = Depth of foundation
Cu = Undrained shear strength (From Laboratory Test)
N = SPT Values related to consistency of Clay Soil
φ = phi (From Field / Laboratory Test)
2 of 2
(b) Settlement for shallow foundation
Settlement=Immediate Settlement +Consolidation Settlement Sf = Si +Sc Si = qnet B*{[1- µ
2]/Es}*If
qnet = Net foundation pressure/Intensity of contact pressure B = Width of footing Es = Undrained Modulus of elasticity of soil µ = Poisson’s Ratio of soil If = Influence coefficient, a function of ratio of length to width of footing=1.12
Sc = mv. ∆p.H. mv= Coefficient of volume change/compressibility.
∆p = Pressure increment due to foundation loading =(LXBXP)/{(L+H/2)(B+H/2)}. H = Thickness of the stratum.
(c) Data Required & Obtained from Laboratory & Field Test Results
Cu = 3.10 T/m2
γ = 1.80 T/m3
φ = 0 0
Allowable Bearing Pressure
Sl.No.
Types of Footing Footing Size
(m x m)
Depth of footing
below E.G.L. (m)
Net Safe Bearing
Capacity (T/m2)
Allowable Bearing Pressure ((T/m2)
Max. Permissible Settlement(mm)
1 Square 1.2 X 1.2 1.5 10.36 10.4 75
2 Square 1.5 X 1.5 1.5 9.94 9.9 75
3 Square 2.0 X 2.0 1.5 9.53 9.5 75
4 Square 2.5 X 2.5 1.5 9.28 9.3 75
5 Square 3.0 X 3.0 1.5 9.12 9.1 75
6 Rectangular 1.5 X 2.5 1.5 8.57 8.6 75
7 Rectangular 2.0 X 3.0 1.5 8.31 8.3 75
8 Rectangular 2.5 X 3.0 1.5 8.33 8.3 75
9 Strip (L/B < 5) 1.5 m wide 1.5 7.96 8.0 75
10 Strip (L/B < 5) 2.0 m wide 1.5 7.62 7.6 75
11 Strip (L/B < 5) 2.5 m wide 1.5 7.42 7.4 75
12 Strip (L/B < 5) 3.0 m wide 1.5 7.29 7.3 75
40 m 03.09.2014
1.0 m 04.09.2014
Fro
m
To
0-1
5 c
m
15
-30
cm
30
-45
cm
N'
Va
lue
0.00
DS 0.50
DS 1.00
SPT 1.50 1.95 4 5 6 11
UDS 2.00
2.50
SPT 3.00 3.45 2 2 3 5
UDS 3.50
Diameter of Boring : 150 mm Depth of Borehole : Date of Commencement :
Date of Completion : Depth of Casing : -Water Stuck : 4.5 m Depth of Casing : - Date of Completion : 02.05.2014
Ty
pe
SAMPLE DETAILS
Th
ick
ne
ss/D
ep
t
h o
f La
ye
r(m
)
DEPTH(M) SPT: No Blows
B.H.NO : 01
Method of Boring : Shell & Auger Ground Elevation: E.G.L.
Nc,Nq,Nγ= Bearing capacity factors (As per I.S.6403-1981)
sc, sq,sγ = Shape factor.
dc,dq,dγ = Depth factor.
ic , iq, iγ = inclination factor.
γ = Bulk unit weight of sub-soil.
W/= Correction factor to account for the effect of water table.
σ = Effective surcharge at the base level of foundation.
B = Width of footings
L = Length of footings
Df = Depth of foundation
Cu = Undrained shear strength (From Laboratory Test)
N = SPT Values related to consistency of Clay Soil
φ = phi (From Field / Laboratory Test)
2 of 2
(b) Settlement for shallow foundation
Settlement=Immediate Settlement +Consolidation Settlement Sf = Si +Sc Si = qnet B*{[1- µ
2]/Es}*If
qnet = Net foundation pressure/Intensity of contact pressure B = Width of footing Es = Undrained Modulus of elasticity of soil µ = Poisson’s Ratio of soil If = Influence coefficient, a function of ratio of length to width of footing=1.12
Sc = mv. ∆p.H. mv= Coefficient of volume change/compressibility.
∆p = Pressure increment due to foundation loading =(LXBXP)/{(L+H/2)(B+H/2)}. H = Thickness of the stratum.
(c) Data Required & Obtained from Laboratory & Field Test Results
Cu = 3.20 T/m2
γ = 1.80 T/m3
φ = 0 0
Allowable Bearing Pressure
Sl.No.
Types of Footing Footing Size
(m x m)
Depth of footing
below E.G.L. (m)
Net Safe Bearing
Capacity (T/m2)
Allowable Bearing Pressure ((T/m2)
Max. Permissible Settlement(mm)
1 Square 1.2 X 1.2 1.5 10.69 10.7 75
2 Square 1.5 X 1.5 1.5 10.26 10.3 75
3 Square 2.0 X 2.0 1.5 9.84 9.8 75
4 Square 2.5 X 2.5 1.5 9.58 9.6 75
5 Square 3.0 X 3.0 1.5 9.41 9.4 75
6 Rectangular 1.5 X 2.5 1.5 8.84 8.8 75
7 Rectangular 2.0 X 3.0 1.5 8.58 8.6 75
8 Rectangular 2.5 X 3.0 1.5 8.60 8.6 75
9 Strip (L/B < 5) 1.5 m wide 1.5 8.21 8.2 75
10 Strip (L/B < 5) 2.0 m wide 1.5 7.87 7.9 75
11 Strip (L/B < 5) 2.5 m wide 1.5 7.66 7.7 75
12 Strip (L/B < 5) 3.0 m wide 1.5 7.53 7.5 75
40 m 05.09.2014
0.8 m 06.09.2014
Fro
m
To
0-1
5 c
m
15
-30
cm
30
-45
cm
N'
Va
lue
0.00
DS 0.50
DS 1.00
SPT 1.50 1.95 2 2 2 4
UDS 2.00
2.50
SPT 3.00 3.45 1 2 2 4
3.50
B.H.NO : 01
Method of Boring : Shell & Auger Ground Elevation: E.G.L.
Nc,Nq,Nγ= Bearing capacity factors (As per I.S.6403-1981)
sc, sq,sγ = Shape factor.
dc,dq,dγ = Depth factor.
ic , iq, iγ = inclination factor.
γ = Bulk unit weight of sub-soil.
W/= Correction factor to account for the effect of water table.
σ = Effective surcharge at the base level of foundation.
B = Width of footings
L = Length of footings
Df = Depth of foundation
Cu = Undrained shear strength (From Laboratory Test)
N = SPT Values related to consistency of Clay Soil
φ = phi (From Field / Laboratory Test)
2 of 2
(b) Settlement for shallow foundation
Settlement=Immediate Settlement +Consolidation Settlement Sf = Si +Sc Si = qnet B*{[1- µ
2]/Es}*If
qnet = Net foundation pressure/Intensity of contact pressure B = Width of footing Es = Undrained Modulus of elasticity of soil µ = Poisson’s Ratio of soil If = Influence coefficient, a function of ratio of length to width of footing=1.12
Sc = mv. ∆p.H. mv= Coefficient of volume change/compressibility.
∆p = Pressure increment due to foundation loading =(LXBXP)/{(L+H/2)(B+H/2)}. H = Thickness of the stratum.
(c) Data Required & Obtained from Laboratory & Field Test Results
Cu = 2.70 T/m2
γ = 1.80 T/m3
φ = 0 0
Allowable Bearing Pressure
Sl.No.
Types of Footing Footing Size
(m x m)
Depth of footing
below E.G.L. (m)
Net Safe Bearing
Capacity (T/m2)
Allowable Bearing Pressure ((T/m2)
Max. Permissible Settlement(mm)
1 Square 1.2 X 1.2 1.5 9.02 9.0 75
2 Square 1.5 X 1.5 1.5 8.66 8.7 75
3 Square 2.0 X 2.0 1.5 8.30 8.3 75
4 Square 2.5 X 2.5 1.5 8.08 8.1 75
5 Square 3.0 X 3.0 1.5 7.94 7.9 75
6 Rectangular 1.5 X 2.5 1.5 7.46 7.5 75
7 Rectangular 2.0 X 3.0 1.5 7.24 7.2 75
8 Rectangular 2.5 X 3.0 1.5 7.25 7.3 75
9 Strip (L/B < 5) 1.5 m wide 1.5 6.93 6.9 75
10 Strip (L/B < 5) 2.0 m wide 1.5 6.64 6.6 75
11 Strip (L/B < 5) 2.5 m wide 1.5 6.47 6.5 75
12 Strip (L/B < 5) 3.0 m wide 1.5 6.35 6.4 75
4 m 30.09.2014
- 01.10.2014
Fro
m
To
0-1
5 c
m
15
-30
cm
30
-45
cm
N'
Va
lue
0.00
DS 0.50
DS 1.00
SPT 1.50 1.95 1 1 2 3
UDS 2.00
2.50
SPT 3.00 3.45 2 2 3 5
3.50
Ty
pe
SAMPLE DETAILS
B.H.NO : 01
Method of Boring : Shell & Auger Ground Elevation: E.G.L.
Nc,Nq,Nγ= Bearing capacity factors (As per I.S.6403-1981)
sc, sq,sγ = Shape factor.
dc,dq,dγ = Depth factor.
ic , iq, iγ = inclination factor.
γ = Bulk unit weight of sub-soil.
W/= Correction factor to account for the effect of water table.
σ = Effective surcharge at the base level of foundation.
B = Width of footings
L = Length of footings
Df = Depth of foundation
Cu = Undrained shear strength (From Laboratory Test)
N = SPT Values related to consistency of Clay Soil
φ = phi (From Field / Laboratory Test)
2 of 2
(b) Settlement for shallow foundation
Settlement=Immediate Settlement +Consolidation Settlement Sf = Si +Sc Si = qnet B*{[1- µ
2]/Es}*If
qnet = Net foundation pressure/Intensity of contact pressure B = Width of footing Es = Undrained Modulus of elasticity of soil µ = Poisson’s Ratio of soil If = Influence coefficient, a function of ratio of length to width of footing=1.12
Sc = mv. ∆p.H. mv= Coefficient of volume change/compressibility.
∆p = Pressure increment due to foundation loading =(LXBXP)/{(L+H/2)(B+H/2)}. H = Thickness of the stratum.
(c) Data Required & Obtained from Laboratory & Field Test Results
Cu = 3.50 T/m2
γ = 1.80 T/m3
φ = 0 0
Allowable Bearing Pressure
Sl.No.
Types of Footing Footing Size
(m x m)
Depth of footing
below E.G.L. (m)
Net Safe Bearing
Capacity (T/m2)
Allowable Bearing Pressure ((T/m2)
Max. Permissible Settlement(mm)
1 Square 1.2 X 1.2 1.5 11.69 11.7 75
2 Square 1.5 X 1.5 1.5 11.22 11.2 75
3 Square 2.0 X 2.0 1.5 10.76 10.8 75
4 Square 2.5 X 2.5 1.5 10.48 10.5 75
5 Square 3.0 X 3.0 1.5 10.29 10.3 75
6 Rectangular 1.5 X 2.5 1.5 9.67 9.7 75
7 Rectangular 2.0 X 3.0 1.5 9.38 9.4 75
8 Rectangular 2.5 X 3.0 1.5 9.40 9.4 75
9 Strip (L/B < 5) 1.5 m wide 1.5 8.98 9.0 75
10 Strip (L/B < 5) 2.0 m wide 1.5 8.61 8.6 75
11 Strip (L/B < 5) 2.5 m wide 1.5 8.38 8.4 75
12 Strip (L/B < 5) 3.0 m wide 1.5 8.23 8.2 75
40 m 24.09.2014
1.2 m 26.09.2014
Fro
m
To
0-1
5 c
m
15
-30
cm
30
-45
cm
N'
Va
lue
0.00
DS 0.50
DS 1.00
SPT 1.50 1.95 4 6 8 14
UDS 2.00
2.50
SPT 3.00 3.45 2 2 3 5
UDS 3.50
Diameter of Boring : 150 mm Depth of Borehole : Date of Commencement :
Date of Completion : Depth of Casing : -Water Stuck : 4.5 m Depth of Casing : - Date of Completion : 02.05.2014
Ty
pe
SAMPLE DETAILS
Th
ick
ne
ss/D
ep
t
h o
f La
ye
r(m
)
DEPTH(M) SPT: No Blows
B.H.NO : 01
Method of Boring : Shell & Auger Ground Elevation: E.G.L.