Evaluation of ks (kN/m) :
AREA C Shape Factor
Depth C (kN/sqm) Cm ks (kN/cum) Spring constant
Soil Report (kN/m) 8 1 15 838 1508 9.5 2.5 19 1061 1910 11 4 15 838 1508 12.5 5.5 21 1173 2111 14 7 24 1340 2412 15.5 8.5 23 1284 2312 17 10 33 1843 3317 18.5 11.5 30 1675 3015 CLAY 20 13 23 1284 2312 21.5 14.5 31 1731 3116 23 16 53 2959 5327 24.5 17.5 58 3238 5829 26 19 51 2848 5126 27.5 20.5 54 3015 5427 B L ks (kN/cum) 22 1.2 1.5 80000 73500 23.5 1.2 1.5 85000 78000 25 1.2 1.5 90000 82500 26.5 1.2 1.5 95000 87000 28 1.2 1.5 100000 91500 SAND 29.5 1.2 1.5 105000 96000 31 1.2 1.5 110000 100500 32.5 1.2 1.5 115000 105000 34 1.2 1.5 120000 109500 35.5 1.2 1.5 125000 111000
density avg 12 considered
Surcharge 10 + Soil fill 4 x 12 48 58 kN/m
on pile q B ko
58 1.2 1 69.6 kN/m
on pile cap
10 4.8 0.3 0.5 7.2 kN
Lateral Earth Pressure on Piles
Depth ko Density D g h -2C 0 1 8 1.2 0 1.5 1 8 1.2 14.4 -30 -15.6 3 1 8 1.2 28.8 -30 -1.2 4.5 1 8 1.2 43.2 -30 13.2 6 1 8 1.2 57.6 -30 27.6 7.5 1 8 1.2 72 -30 42 9 1 8 1.2 86.4 -30 56.4 10.5 1 8 1.2 100.8 -30 70.8 12 1 8 1.2 115.2 -30 85.2 13.5 1 8 1.2 129.6 -30 99.6 on pile cap 2.4 0.3 18 0.5 6.48 kN Bunker Raft
Surcharge Load Due to Construction Equipment
Deep Pit in STG Building FL (-) 9.0 m
Surcharge Load Lateral Earth Pressure
1200 Dia. Bored Cast-in-situ Piles
Bunker Raft
Surcharge Load Due to Construction Equipment
Deep Pit in STG Building FL (-) 9.0 m
Surcharge Load Lateral Earth Pressure
The horizontal modulus of sub grade reaction is (Refer J. Bowles Eq. 9-10 Page 504)
Ks = As + Bs Zn
Z = Depth of Interest below ground
As = constant for either horizontal or vertical members
Bs = coefficient for depth variation
n = exponent to give Ks the best fit
Depth
6.5-19
Substituting
19-28
As = Area x (80xFOSxBC)
28-36
36-43
And n =1
Where Bs = C
C = 80 (corresponding to
= 12 mm settlement)
m3
As per Meyerhof Nq = e
tan
2
(45 +
/2)
From NGL Z (C.O.L) As
Nq
Sq
sub
Bs
Bs
6.5
1
7620
1
1
8
812.8
0
9.5
3
7620
1
1
8 1407.811
0
12.5
6
7620
1
1
8 1990.945
0
15.5
9
7620
1
1
8
2438.4
18.5
12
7620
1
1
8 2815.622
21.5
15
38100
1
1
9 3541.456
24.5
18
38100
1
1
9 3879.471
27.5
21
38100
1
1
9 4190.307
30.5
24
50800
23.15 1.006871
9 104432.5
33.5
27
50800
23.15 1.006871
10 123074.9
36.5
30
50800
23.15 1.006871
10 129732.4
39.5
33
63500
26.07 1.007161
10 153217.2
42.5
36
63500
26.07 1.007161
10 160030.1
Ks values at various depth are
L
B
K
1.0
7620
1
0.76
K
2.0
7620
2
0.76
K
3
7620
3
0.76
K
4
10058.4
3
0.76
K
5
10435.62
3
0.76
K
6
41641.46
3
0.76
K
7
41979.47
3
0.76
K
8
42290.31
3
0.76
K
9
155232.5
3
0.76
K
10
173874.9
3
0.76
K
11
180532.4
3
0.76
K
12
216717.2
3
0.76
K
13
223530.1
3
0.76
Spring stiffness are
K
1
=
BL ( 2.k
s1
+ k
s2
) / 6
K
2
=
BL ( 2.k
s2
+ k
s1
) / 6
K'
2
=
BL ( 2.k
s2
+ k
s3
) / 6
K
2
=
K
2
+k'
2
K
1
2895.6
K
2
5791.2
K'
2
5791.2
K
2
11582.4
K
3
8686.8
K'
3
9613.392
K
3
18300.19
K
4
10539.98
K'
4
11609.92
K
4
22149.9
K
5
11753.26
K'
5
23754.83
K
5
35508.09
K
6
35613.04
K'
6
47599.71
K
6
83212.75
K
7
47728.15
K'
7
47974.71
K
7
95702.87
K
8
48092.83
K'
8
91129
K
8
139221.8
K
9
134047
K'
9
184049.2
K
9
318096.2
K
10
191133.3
K'
10
200747.2
K
10
391880.5
K
11
203277.1
K'
11
219557.1
K
11
422834.2
K
12
233307.3
K'
12
249646.5
K
12
482953.8
Strata
BC (kN/m2)phi
Clay
30
0
Stiff clay
150
0
Dense sand
200
32
Evaluation of ks (kN/m) :
AREA C Shape Factor
Depth C (kN/sqm) Cm ks (kN/cum) Spring constant
Soil Report (kN/m) 6.5 1 1 12 1058 804 9.5 3 4 12 1058 2412 12.5 3 6 20 1763 4020 15.5 3 9 20 1763 4020 18.5 3 12 25 2204 5025 21.5 3 15 45 3967 9045 24.5 3 18 45 3967 9045 B L ks (kN/cum) 27.5 3 21 0.76 1.5 80000 46550 30.5 3 24 0.76 1.5 85000 49400 33.5 3 27 0.76 1.5 90000 52250 36.5 3 30 0.76 1.5 95000 55100 39.5 3 33 0.76 1.5 100000 57950 SAND 42.5 3 36 0.76 1.5 105000 39900
density avg 12 considered
Surcharge 10 + Soil fill 4 x 12 48 58 kN/m
on pile q B ko
58 1.2 1 69.6 kN/m
on pile cap
10 4.8 0.3 0.5 7.2 kN
Lateral Earth Pressure on Piles
Depth ko Density D g h -2C 0 1 8 1.2 0 1.5 1 8 1.2 14.4 -30 -15.6 3 1 8 1.2 28.8 -30 -1.2 4.5 1 8 1.2 43.2 -30 13.2 6 1 8 1.2 57.6 -30 27.6 7.5 1 8 1.2 72 -30 42 9 1 8 1.2 86.4 -30 56.4 10.5 1 8 1.2 100.8 -30 70.8 12 1 8 1.2 115.2 -30 85.2 13.5 1 8 1.2 129.6 -30 99.6 on pile cap 2.4 0.3 18 0.5 6.48 kN Bunker Raft
Surcharge Load Due to Construction Equipment
Deep Pit in STG Building FL (-) 9.0 m
Surcharge Load Lateral Earth Pressure
1200 Dia. Bored Cast-in-situ Piles
Bunker Raft
Surcharge Load Due to Construction Equipment
Deep Pit in STG Building FL (-) 9.0 m
Surcharge Load Lateral Earth Pressure
Evaluation of ks (kN/m) :
AREA C Shape Factor
Depth C (kN/sqm) Cm ks (kN/cum) Spring constant
Soil Report (kN/m) 8 1 12.5 2094 838 9.5 2 12.5 2094 838 11 3 12.5 2094 838 12.5 4 12.5 2094 838 14 5 12.5 2094 838 15.5 6 12.5 2094 838 17 7 12.5 2094 838 18.5 8 12.5 2094 838 CLAY 20 9 12.5 2094 838 21.5 23 24.5 26 27.5 B L ks (kN/cum) 11 2 0.4 2 4000 1733.333333 13 2 0.4 2 5000 2133.333333 15 2 0.4 2 6000 2933.333333 18 3 0.4 3 10000 5200 SAND
density avg 12 considered
Surcharge 10 + Soil fill 4 x 12 48 58 kN/m
on pile q B ko
58 1.2 1 69.6 kN/m
on pile cap
10 4.8 0.3 0.5 7.2 kN
Lateral Earth Pressure on Piles
Depth ko Density D g h -2C 0 1 8 1.2 0 1.5 1 8 1.2 14.4 -30 -15.6 3 1 8 1.2 28.8 -30 -1.2 4.5 1 8 1.2 43.2 -30 13.2 6 1 8 1.2 57.6 -30 27.6 7.5 1 8 1.2 72 -30 42 9 1 8 1.2 86.4 -30 56.4 10.5 1 8 1.2 100.8 -30 70.8 12 1 8 1.2 115.2 -30 85.2 13.5 1 8 1.2 129.6 -30 99.6 on pile cap 2.4 0.3 18 0.5 6.48 kN Bunker Raft
Surcharge Load Due to Construction Equipment
Deep Pit in STG Building FL (-) 9.0 m
Surcharge Load Lateral Earth Pressure
1200 Dia. Bored Cast-in-situ Piles
Bunker Raft
Surcharge Load Due to Construction Equipment
Deep Pit in STG Building FL (-) 9.0 m
Surcharge Load Lateral Earth Pressure
