Environmental Engineering Reference
In-Depth Information
ABCDE
F GHI
J KL MNOP
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VDrainSettlement
Calculate
Test1
Test2
Band-drain spaced at 1.0 m
TRUE
TRUE
TRUE
Any consistent system of units can be used.
Examples:
(meter, m
2
/day, day, kN/m
3
, kN/m
2
),
Existing effective
overburden pressure
Maximum
past pressure
OR (meter, m
2
/year, year, kN/m
3
, kN/m
2
)
Elevation
σ
vo
′
Elevation
σ
vp
′
6.90
-3.20
0.00
-3.20
6.00
Original mud thickness
Original mud-top elevation
-3.20
-10.10 34.50
-10.10 47.40
1.50
Elevation of sea level
m
2
/day
C
v
, vertical coefficient of consolidation
0.00274
Single (
j
=
1) or double (
j
=
0.5) drainage
0.5
m
2
/day
C
h
, Horizontal coef. of consolidation
0.0101
Equivalent drain spacing (> drain diameter)
1.58
0.067
Equivalent drain diameter (≥ 0)
Smear diameter ratio (≥1)
2.0
4.63
Smear k ratio (≥1)
Time of V-Drain installation
0.0
0.360
Compression ratio of mud
0.025
Recompression ratio of mud
Unit weight of fill above water level
20.0
10.0
Buoyant unit weight of fill
10
30
60
65
120
200
265
270
300
365
700
1000
2000
5000
Time, days
VDrainSt
0.206
0.359
0.620
0.774
1.514
1.855
1.974
2.037
2.233
2.447
2.667
2.681
2.682
2.682
Formula in cells A25 to N25: “=IF($H$3,VDrainSt($H$8...),0)”
Fill thickness
Time Thickness
-80
Log time (days)
0.5
10
100
1000
10000
-20
5.5
0.000
0.500
1.000
1.500
2.000
2.500
3.000
3.500
60
10.7
VDrainSt computed results
Range of measured results
265
16.4
4000
16.4
Negative time means before drain installation
20
10
Fill thickness vs. time
0
-100
100
300
500
700
900
Figure 9.18
Program-computed results for Check Lap Kok 1.5 m band-drain test fill quadrant, and com-
parison with measured settlement range. The
c
v
and
c
h
values of 0.00274 and 0.0101 m
2
/day
correspond to 1 and 3.7 m
2
/year, respectively.
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