Table 1. Typical engineering geological layers influence FPD land subsidence in Shanghai, China
Layer No
|
Layer name
|
Depth (m)
|
①
|
Topsoil layer
|
0.0
|
②
|
First sand layer
|
0.9-7.0
|
③
|
First hard soil layer
|
1.0-5.0
|
④
|
First soft soil layer
|
3.0
|
⑤
|
Second soft soil layer
|
18.0-20.0
|
⑥
|
Second hard soil layer
|
15.0-30.0
|
⑦
|
Second sand layer (the first confined aquifer)
|
27.0-30.0
|
Table 2. Principle of LSPC partition in Shanghai, China
Engineering geological area
|
Characteristics
|
Remarks
|
Partition
|
Sub partition
|
Ⅰ
(Lakes and marshes plain area)
|
-
|
Division of two hard layers
|
First confined aquifer (⑦) is dominated by silty soil.
|
Ⅱ
(Coastal plain area)
|
Normal sedimentary area
|
Ⅱ1
|
Layers ⑥ and ⑧distribution area
|
|
Ⅱ2
|
Layer ⑥distribution area; Layer ⑧ absence
|
Paleo channel area
|
Ⅱ3
|
Layer ⑥ absence; Layer ⑧distribution area
|
First confined aquifer (⑦) is dominated by sand.
|
Ⅱ4
|
Layers ⑥ and ⑧ absence area
|
Ⅲ
(River estuary sand island area)
|
-
|
Distribution area of non-hard soil layer
|
First confined aquifer (⑦) is most missing
|
Ⅳ
(Tidal flat geomorphic area)
|
-
|
New reclaimed area
|
First confined aquifer (⑦) is dominated by sand
|
Table 3. Principle of SDDC partition in Shanghai, China
![](https://myfiles.space/user_files/69515_16346c490bab499e/69515_custom_files/img1642058427.png)
Table 4 Length-width corresponding to area of foundation pit (unit: m)
Area(m2)
Ratio
|
1000
|
2000
|
3000
|
4000
|
5000
|
1:1
|
31.6×31.6
|
44.7×44.7
|
54.8×54.8
|
63.2×63.2
|
70×70
|
1.5:1
|
38.7×25.8
|
54.8×36.5
|
67.1×44.7
|
77.5×51.6
|
86.6×57.7
|
2:1
|
44.7×22.4
|
63.2×31.6
|
77.5×38.7
|
89.4×44.7
|
100×50
|
2.5:1
|
50×20
|
70.7×28.3
|
86.6×34.6
|
100×40
|
111.8×44.7
|
3:1
|
54.8×18.3
|
77.5×25.8
|
94.8×31.6
|
109.5×36.5
|
122.5×40.8
|
Area(m2)
Ratio
|
6000
|
7000
|
8000
|
9000
|
10000
|
1:1
|
77.5×77.5
|
83.7×83.7
|
89.4×89.4
|
94.9×94.9
|
100×100
|
1.5:1
|
94.9×63.2
|
102.5×68.3
|
109.5×73
|
116.2×77.5
|
122.5×81.6
|
2:1
|
109.6×54.8
|
118.3×59.2
|
126.4×63.2
|
134.2×67.1
|
141.4×70.7
|
2.5:1
|
122.5×50
|
132.3×52.9
|
141.4×56.6
|
150×60
|
158.1×63.2
|
3:1
|
134.2×44.7
|
144.9×48.3
|
154.9×51.6
|
164.4×54.8
|
173.2×57.7
|
Table 5 Numerical simulation parameters
Soil sequence number
|
Soil property
|
Water content (%)
|
Gravity
γ(KN/m3)
|
Void ratio e
|
Hydraulic conductivity
(cm/s)
|
Compress
coefficient D 0.1~0.2
(MPa-1)
|
Compress
modulus E0.1~0.2
(MPa)
|
KV
|
KH
|
②
|
Cohesive soil
|
40
|
18.0
|
0.95
|
3.00×10-4
|
3.50×10-7
|
0.33
|
34.9
|
③,④
|
Muddy clay and silty clay
|
45
|
17.3
|
1.25
|
2.17×10-7
|
3.00×10-4
|
1.04
|
9.2
|
⑤
|
Cohesive soil
|
35
|
18.4
|
1.035
|
1.16×10-7
|
3.50×10-6
|
0.29
|
19.3
|
⑤2
|
Silty soil and silt
|
33
|
19.6
|
0.935
|
3.50×10-4
|
3.50×10-6
|
0.07
|
50.1
|
⑥
|
Cohesive soil
|
25
|
19.5
|
0.72
|
1.07×10-7
|
1.07×10-7
|
0.22
|
30.4
|
⑦
|
Silty soil and fine sand
|
30
|
18.1
|
0.76
|
6.15×10-4
|
6.15×10-4
|
0.15
|
115.7
|
⑧
|
Clay mix ed with silt
|
30
|
19.7
|
1.01
|
2.22×10-7
|
2.22×10-7
|
0.35
|
42.4
|
⑨
|
Silt and fine sand with medium and coarse sand
|
20
|
17.3
|
0.68
|
9.72×10-4
|
9.75×10-4
|
0.14
|
93.3
|
Table 6 Numerical simulation scenarios
SSoil sequence number
|
Partition
|
Features
|
Working conditions of controlled drawdown
|
Stratigraphic characteristics
|
Aquifer floor depth B(m)
(The roof depth D is used in the stratum)
|
Digging depth(m)
|
Insertion depth of diaphragm wall into target aquifer(m)
|
Aspect ratio
|
Area (m2)
|
⑤2
|
⑤2Ⅱ-1
|
Paleochannel area of coastal plain
|
B less than 30
|
The partition is small and remote, refer to ⑤II -2
|
1:1
1.5:1
2:1
2:1.5
3:1
|
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
|
⑤2Ⅱ-2
|
Paleochannel area of coastal plain
|
30< B < 60
|
16/20/24
|
5/10
|
⑤2Ⅲ-2
|
Distribution area of non-hard soil layer
|
30< B < 60
|
Chongming Island is not counted for the time being
|
⑤2Ⅳ-2
|
New continental area
|
30< B < 60
|
Partition too small can refer to ⑤II -2
|
⑦
|
⑦Ⅰ-1
|
Division of two hard layers
|
30< B or less than 60
|
Aquifer with shallower depth and smaller thickness can be directly separated
|
⑦Ⅱ1-1
|
Average distribution partition of Layer ⑥ and Layer ⑧
|
30< B or less than 60
|
20/24/28
|
5
|
⑦Ⅱ1-2
|
B > 60
|
20/24/28
|
5/10/15/20/25
|
⑦Ⅱ2-3
|
Layer ⑥ distribution and Layer ⑧lost areas
|
Communication of Confined Aquifers
|
20/24/28
|
5/10/15/20/25/30
|
⑦Ⅱ3-1
|
Layer ⑥ deletion and Layer ⑧distribution area
|
30< B or less than 60
|
16/20/24/28
|
5/10/15
|
⑦Ⅱ3-2
|
B > 60
|
28/32
|
5
|
⑦Ⅱ4-3
|
Layer ⑥ and Layer ⑧ missing areas
|
Communication of Confined Aquifers
|
20/24/28
|
5/10/15/20/25
|
⑦Ⅳ-1
|
New continental area
|
30< B or less than 60
|
The partition is too small to refer to ⑦IV -2
|
⑦Ⅳ-2
|
B > 60
|
20/24/28
|
5/10/15
|
⑦Ⅳ-3
|
Communication of Confined Aquifers
|
24/28
|
5/10/15/20/25
|
⑨
|
⑨Ⅰ-1
|
Division of two hard layers
|
D Hard Soil Layer
|
Partition too small can refer to ⑨II 1-2
|
⑨Ⅰ-2
|
D > 60
|
The depth of aquifer is so deep that no dewatering is needed in the e× cavation of foundation pit at present.
|
⑨Ⅱ1-1
|
Layer ⑧ distribution area
|
D less than 60
|
Partition too small can refer to ⑨II 1-2
|
⑨Ⅱ1-2
|
D > 60
|
32/36
|
5
|
⑨Ⅱ3-1
|
Layer ⑧ distribution area
|
D less than 60
|
Partition too small can refer to ⑨II 3-2
|
⑨Ⅱ3-2
|
D > 60
|
32/36
|
5
|
⑨Ⅲ-1
|
Distribution area of non-hard soil layer
|
D less than 60
|
Chongming Island is not counted for the time being
|
⑨Ⅲ-2
|
D > 60
|
Chongming Island is not counted for the time being
|
⑨Ⅳ-1
|
New continental area
|
D less than 60
|
Partition too small can refer to ⑨II 3-2
|
⑨Ⅳ-2
|
D > 60
|
The depth of aquifer is so deep that no dewatering is needed in the excavation of foundation pit at present.
|
Table 7 Ratio of drawdown of Y to X (length-width direction)
Partition
|
Ratio of drawdown of Y to X
|
⑤2Ⅱ-2
|
0.849
|
⑦Ⅱ1-1
|
0.909
|
⑦Ⅱ1-2
|
0.908
|
⑦Ⅱ2-3
|
0.910
|
⑦Ⅱ3-1
|
0.906
|
⑦Ⅱ3-2
|
0.879
|
⑦Ⅱ4-3
|
0.908
|
⑦Ⅳ2
|
0.882
|
⑦Ⅳ3
|
0.931
|
⑨Ⅱ1-2
|
0.967
|
⑨Ⅱ3-2
|
0.962
|
Table 8 Ratio of 3H drawdown with different length–width ratio
Aspect ratio
Partition
|
1:1
|
1.5:1
|
2:1
|
2.5:1
|
3:1
|
⑤2Ⅱ-2
|
0.929
|
0.969
|
1.000
|
1.023
|
1.042
|
⑦Ⅱ1-1
|
0.945
|
0.978
|
1.000
|
1.018
|
1.035
|
⑦Ⅱ1-2
|
0.931
|
0.969
|
1.000
|
1.022
|
1.042
|
⑦Ⅱ2-3
|
0.961
|
0.982
|
1.000
|
1.012
|
1.023
|
⑦Ⅱ3-1
|
0.939
|
0.973
|
1.000
|
1.022
|
1.045
|
⑦Ⅱ3-2
|
0.927
|
0.970
|
1.000
|
1.024
|
1.047
|
⑦Ⅱ4-3
|
0.948
|
0.980
|
1.000
|
1.015
|
1.028
|
⑦Ⅳ2
|
0.937
|
0.975
|
1.000
|
1.016
|
1.033
|
⑦Ⅳ3
|
0.963
|
0.985
|
1.000
|
1.011
|
1.021
|
⑨Ⅱ1-2
|
0.977
|
0.990
|
1.000
|
1.008
|
1.017
|
⑨Ⅱ3-2
|
0.978
|
0.989
|
1.000
|
1.010
|
1.022
|
Table 9 Drawdown increment with 1 m increment for pit depth
Serial number
|
Partition
|
Drawdown increment (m)
|
1
|
⑤2Ⅱ-2
|
0.28~0.83
|
2
|
⑦Ⅱ1-1
|
0.77~1.15
|
3
|
⑦Ⅱ1-2
|
0.23~1.22
|
4
|
⑦Ⅱ2-3
|
0.13~0.99
|
5
|
⑦Ⅱ3-1
|
0.36~1.30
|
6
|
⑦Ⅱ3-2
|
0.49~0.76
|
7
|
⑦Ⅱ4-3
|
0.09~0.83
|
8
|
⑦Ⅳ2
|
0.29~1.04
|
9
|
⑦Ⅳ3
|
0.09~0.73
|
10
|
⑨Ⅱ1-2
|
0.87~1.20
|
11
|
⑨Ⅱ3-2
|
0.86~1.26
|
Table 10 Drawdown reduction with 1 m cutoff depth increment of when Foundation Pit Area, Depth and Length-to-Width Ratio were constant
Serial number
|
Partition
|
Reduction of 3H drawdown (m)
|
1
|
⑤2Ⅱ-2
|
0.13~0.39
|
2
|
⑦Ⅱ1-1
|
-
|
3
|
⑦Ⅱ1-2
|
0.12~0.59
|
4
|
⑦Ⅱ2-3
|
0.02~0.36
|
5
|
⑦Ⅱ3-1
|
0.09~0.70
|
6
|
⑦Ⅱ3-2
|
-
|
7
|
⑦Ⅱ4-3
|
0.01~0.32
|
8
|
⑦Ⅳ2
|
0.13~0.51
|
9
|
⑦Ⅳ3
|
0.03~0.27
|
10
|
⑨Ⅱ1-2
|
-
|
11
|
⑨Ⅱ3-2
|
-
|
Table 11 3H drawdown increment with 1000 m2 foundation pit area increment
Serial number
|
Partition
|
Increasing 3H drawdown(m)
|
1
|
⑤2Ⅱ-2
|
0.02~1.16
|
2
|
⑦Ⅱ1-1
|
0.05~1.19
|
3
|
⑦Ⅱ1-2
|
0.06~2.30
|
4
|
⑦Ⅱ2-3
|
0.07~1.52
|
5
|
⑦Ⅱ3-1
|
0.02~2.11
|
6
|
⑦Ⅱ3-2
|
0.03~0.71
|
7
|
⑦Ⅱ4-3
|
0.06~1.28
|
8
|
⑦Ⅳ2
|
0.05~1.60
|
9
|
⑦Ⅳ3
|
0.14~1.08
|
10
|
⑨Ⅱ1-2
|
0.03~0.74
|
11
|
⑨Ⅱ3-2
|
0.03~0.78
|
Table12 3H drawdown fit goodness coefficient
![](https://myfiles.space/user_files/69515_16346c490bab499e/69515_custom_files/img1642058767.png)
Table 13 3H drawdown and fitting optimality coefficient for normal foundation pit
Serial number
|
Partition
|
a
|
b
|
c
|
f
|
d
|
e
|
k
|
Goodness of fit coefficient
|
1
|
⑤2Ⅱ-2
|
2.939×10-5
|
0.075
|
1.720
|
2.609
|
-0.027
|
0.511
|
0.101
|
0.956
|
2
|
⑦Ⅱ1-1
|
2.307×10-5
|
0.088
|
0.000
|
2.765
|
0.005
|
0.500
|
0.082
|
0.980
|
3
|
⑦Ⅱ1-2
|
3.842×10-5
|
0.065
|
2.252
|
2.990
|
0.036
|
0.477
|
0.107
|
0.880
|
4
|
⑦Ⅱ2-3
|
2.922×10-5
|
0.044
|
1.065
|
4.510
|
1.017
|
-0.008
|
-3.919
|
0.933
|
5
|
⑦Ⅱ3-1
|
2.945×10-5
|
0.072
|
1.911
|
2.973
|
0.299
|
0.350
|
0.145
|
0.942
|
6
|
⑦Ⅱ3-2
|
1.932×10-5
|
0.054
|
0.000
|
3.374
|
0.021
|
0.491
|
0.113
|
0.975
|
7
|
⑦Ⅱ4-3
|
2.746×10-5
|
0.041
|
0.957
|
4.665
|
-0.217
|
0.610
|
0.057
|
0.937
|
8
|
⑦Ⅳ2
|
2.689×10-5
|
0.060
|
1.524
|
3.219
|
-0.226
|
0.608
|
0.068
|
0.946
|
9
|
⑦Ⅳ3
|
3.460×10-5
|
0.041
|
1.230
|
3.916
|
1.014
|
-0.006
|
-4.395
|
0.928
|
10
|
⑨Ⅱ1-2
|
4.791×10-6
|
0.035
|
0.000
|
7.688
|
0.354
|
0.322
|
0.059
|
0.992
|
11
|
⑨Ⅱ3-2
|
4.114×10-6
|
0.033
|
0.000
|
9.860
|
0.974
|
0.013
|
1.716
|
0.993
|
Fitting formula
|
![](https://myfiles.space/user_files/69515_16346c490bab499e/69515_custom_files/img1642058809.png)
Ds - Deep drawdown value of target aquifer water level at 3H control point outside foundation pit (m)
D-Depth of diaphragm wall insertion into target aquifer roof (m)
W-Depth of Foundation Pit Excavation(m)
M - Foundation Pit Area (m2)
P - Length to Width Ratio of Foundation Pit (Length/Width)
|
Table 14 3H drawdown and fitting optimality coefficient for narrow and long foundation pit
Partition
|
Coefficient
|
Goodness of fit coefficient
|
a
|
b
|
f
|
⑦Ⅱ1-1
|
0.000
|
255.581
|
0.284
|
0.999
|
⑦Ⅱ1-2
|
0.083
|
0.935
|
2.834
|
0.851
|
⑦Ⅱ2-3
|
0.000
|
30.549
|
0.999
|
0.972
|
⑦Ⅱ3-1
|
0.117
|
0.486
|
2.205
|
0.987
|
⑦Ⅱ4-3
|
0.048
|
3.941
|
1.606
|
0.879
|
⑦Ⅳ2
|
0.000
|
1564.174
|
0.388
|
0.942
|
⑦Ⅳ3
|
0.000
|
50.082
|
0.597
|
0.982
|
Fitting formula
|
![](https://myfiles.space/user_files/69515_16346c490bab499e/69515_custom_files/img1642058861.png)
Ds—Deep drawdown value of target aquifer water level at 3H control point outside foundation pit (m)
D—Depth of diaphragm wall insertion into target aquifer roof (m)
W—Depth of Foundation Pit Excavation(m)
|
Table 15 Drawdown affected distance and fitting optimality coefficient
Serial number
|
Name
|
a
|
b
|
c
|
f
|
Goodness of fit coefficient
|
1
|
⑤2Ⅱ-2
|
0.017
|
0.280
|
2.953
|
3.055
|
0.994
|
2
|
⑦Ⅱ1-1
|
0.994
|
17.616
|
0.000
|
1.152
|
0.924
|
3
|
⑦Ⅱ1-2
|
0.192
|
1.325
|
37.326
|
1.762
|
0.813
|
4
|
⑦Ⅱ2-3
|
0.018
|
0.152
|
2.212
|
4.073
|
0.838
|
5
|
⑦Ⅱ3-1
|
0.109
|
1.250
|
23.296
|
1.847
|
0.904
|
6
|
⑦Ⅱ3-2
|
0.079
|
1.299
|
0.000
|
1.731
|
0.980
|
7
|
⑦Ⅱ4-3
|
0.015
|
0.138
|
2.131
|
4.117
|
0.902
|
8
|
⑦Ⅳ2
|
0.094
|
1.161
|
21.316
|
1.767
|
0.924
|
9
|
⑦Ⅳ3
|
0.051
|
0.243
|
5.631
|
2.788
|
0.886
|
10
|
⑨Ⅱ1-2
|
0.473
|
9.139
|
0.000
|
1.253
|
0.940
|
11
|
⑨Ⅱ3-2
|
0.003
|
0.148
|
0.000
|
4.325
|
0.993
|
Fitting formula
|
![](https://myfiles.space/user_files/69515_16346c490bab499e/69515_custom_files/img1642058899.png)
Dy-Influence distance of water level drawdown of target aquifer for dewatering outside foundation pit (m)
D-Depth of diaphragm wall insertion into aquifer roof (m)
W-Depth of foundation pit excavation(m)
M - Foundation pit area (m)
P - Length to width ratio of foundation pit (Length/Width)
|
Table 16 3H drawdown under different area, depth and diaphragm wall depth for layer ⑤2
Partition
|
Foundation pit depth(m)
|
Insert depth of diaphragm wall (m)
|
Foundation pit area (m2)
|
1000
|
2000
|
3000
|
4000
|
5000
|
6000
|
7000
|
8000
|
9000
|
10000
|
⑤2Ⅱ-2
|
16
|
5
|
2.83
|
3.23
|
3.47
|
3.60
|
3.73
|
3.81
|
3.90
|
3.96
|
3.99
|
4.01
|
10
|
2.05
|
2.48
|
2.75
|
2.91
|
3.01
|
3.13
|
3.22
|
3.29
|
3.33
|
3.36
|
20
|
5
|
5.04
|
5.91
|
6.34
|
6.59
|
6.78
|
6.91
|
7.06
|
7.16
|
7.24
|
7.31
|
10
|
3.63
|
4.44
|
4.92
|
5.20
|
5.43
|
5.62
|
5.78
|
5.89
|
5.98
|
6.06
|
24
|
5
|
6.61
|
7.77
|
8.36
|
8.72
|
8.96
|
9.20
|
9.38
|
9.56
|
9.70
|
9.80
|
10
|
4.76
|
5.83
|
6.46
|
6.88
|
7.21
|
7.43
|
7.65
|
7.84
|
8.00
|
8.08
|
Table 17 Drawdown of 3H under different area, depth and diaphragm wall depth for layer ⑦
Partition
|
Foundation pit depth(m)
|
Insert depth of diaphragm wall (m)
|
Foundation pit area (m2)
|
1000
|
2000
|
3000
|
4000
|
5000
|
6000
|
7000
|
8000
|
9000
|
10000
|
⑦Ⅱ1-1
|
20
|
5
|
4.51
|
4.95
|
5.25
|
5.45
|
5.58
|
5.7
|
5.80
|
5.88
|
5.94
|
5.99
|
24
|
5
|
8.11
|
8.94
|
9.48
|
9.85
|
10.07
|
10.25
|
10.38
|
10.48
|
10.54
|
10.59
|
28
|
5
|
11.17
|
12.36
|
13.15
|
13.68
|
14.05
|
14.37
|
14.64
|
14.87
|
15.04
|
15.15
|
⑦Ⅱ1-2
|
20
|
5
|
4.94
|
5.75
|
6.21
|
6.51
|
6.73
|
6.92
|
7.11
|
7.21
|
7.34
|
7.40
|
10
|
3.60
|
4.63
|
5.22
|
5.61
|
5.87
|
6.13
|
6.28
|
6.44
|
6.57
|
6.70
|
15
|
2.87
|
3.89
|
4.50
|
4.91
|
5.21
|
5.47
|
5.64
|
5.81
|
5.96
|
6.10
|
20
|
2.28
|
3.20
|
3.77
|
4.16
|
4.45
|
4.71
|
4.89
|
5.06
|
5.21
|
5.35
|
25
|
1.60
|
2.24
|
2.70
|
2.96
|
3.19
|
3.45
|
3.62
|
3.79
|
3.93
|
4.04
|
24
|
5
|
8.11
|
9.46
|
10.23
|
10.75
|
11.13
|
11.45
|
11.78
|
11.96
|
12.18
|
12.29
|
10
|
6.42
|
7.62
|
8.61
|
9.26
|
9.82
|
10.14
|
10.40
|
10.67
|
10.90
|
11.12
|
15
|
4.70
|
6.40
|
7.42
|
8.10
|
8.61
|
9.05
|
9.34
|
9.63
|
9.88
|
10.12
|
20
|
3.70
|
5.26
|
6.20
|
6.86
|
7.35
|
7.79
|
8.09
|
8.38
|
8.64
|
8.88
|
25
|
2.62
|
3.68
|
4.39
|
4.88
|
5.26
|
5.65
|
5.98
|
6.27
|
6.52
|
6.70
|
28
|
5
|
10.87
|
12.71
|
13.78
|
14.51
|
15.04
|
15.65
|
15.97
|
16.22
|
16.54
|
16.70
|
10
|
8.53
|
10.24
|
11.59
|
12.48
|
13.30
|
13.71
|
14.08
|
14.46
|
14.78
|
15.09
|
15
|
6.30
|
8.60
|
9.98
|
10.92
|
11.62
|
12.23
|
12.64
|
13.05
|
13.39
|
13.73
|
20
|
5.02
|
7.07
|
8.35
|
9.24
|
9.93
|
10.53
|
10.94
|
11.35
|
11.71
|
12.04
|
25
|
3.52
|
4.94
|
5.90
|
6.58
|
7.20
|
7.72
|
8.09
|
8.50
|
8.84
|
9.08
|
⑦Ⅱ2-3
|
20
|
5
|
1.27
|
1.67
|
1.92
|
2.10
|
2.23
|
2.34
|
2.44
|
2.52
|
2.61
|
2.68
|
10
|
0.80
|
1.17
|
1.44
|
1.65
|
1.80
|
1.94
|
2.05
|
2.16
|
2.25
|
2.34
|
15
|
0.60
|
0.94
|
1.19
|
1.39
|
1.55
|
1.69
|
1.81
|
1.92
|
2.01
|
2.10
|
20
|
0.47
|
0.78
|
1.01
|
1.20
|
1.36
|
1.49
|
1.61
|
1.71
|
1.82
|
1.91
|
25
|
0.39
|
0.66
|
0.87
|
1.05
|
1.20
|
1.33
|
1.45
|
1.55
|
1.65
|
1.74
|
30
|
0.33
|
0.57
|
0.76
|
0.93
|
1.07
|
1.21
|
1.32
|
1.42
|
1.52
|
1.61
|
24
|
5
|
3.08
|
4.07
|
4.70
|
5.15
|
5.48
|
5.77
|
6.02
|
6.23
|
6.46
|
6.64
|
10
|
1.94
|
2.87
|
3.54
|
4.04
|
4.44
|
4.79
|
5.07
|
5.34
|
5.57
|
5.79
|
15
|
1.46
|
2.30
|
2.93
|
3.43
|
3.83
|
4.19
|
4.48
|
4.75
|
5.00
|
5.23
|
20
|
1.16
|
1.91
|
2.49
|
2.97
|
3.36
|
3.71
|
4.00
|
4.27
|
4.45
|
4.75
|
25
|
0.96
|
1.62
|
2.16
|
2.61
|
2.98
|
3.32
|
3.61
|
3.88
|
4.12
|
4.36
|
30
|
0.81
|
1.40
|
1.90
|
2.32
|
2.68
|
3.00
|
3.29
|
3.55
|
3.79
|
4.02
|
28
|
5
|
4.64
|
6.16
|
7.13
|
7.85
|
8.37
|
8.83
|
9.22
|
9.56
|
9.94
|
10.23
|
10
|
2.92
|
4.36
|
5.38
|
6.17
|
6.80
|
7.34
|
7.78
|
8.20
|
8.57
|
8.92
|
15
|
2.21
|
3.50
|
4.47
|
5.25
|
5.88
|
6.43
|
6.89
|
7.32
|
7.70
|
8.07
|
20
|
1.76
|
2.91
|
3.82
|
4.55
|
5.17
|
5.71
|
6.17
|
6.60
|
6.99
|
7.35
|
25
|
1.46
|
2.49
|
3.32
|
4.01
|
4.60
|
5.13
|
5.58
|
6.01
|
6.39
|
6.76
|
30
|
1.24
|
2.16
|
2.93
|
3.59
|
4.15
|
4.66
|
5.10
|
5.51
|
5.89
|
6.25
|
⑦Ⅱ3-1
|
16
|
5
|
2.68
|
2.97
|
3.17
|
3.30
|
3.38
|
3.46
|
3.51
|
3.55
|
3.57
|
3.60
|
10
|
1.93
|
2.36
|
2.61
|
2.77
|
2.88
|
2.98
|
3.04
|
3.10
|
3.13
|
3.16
|
15
|
1.38
|
1.76
|
2.00
|
2.16
|
2.27
|
2.37
|
2.43
|
2.51
|
2.55
|
2.59
|
20
|
5
|
6.46
|
7.20
|
7.68
|
8.01
|
8.21
|
8.42
|
8.57
|
8.66
|
8.71
|
8.81
|
10
|
4.67
|
5.71
|
6.32
|
6.71
|
6.99
|
7.23
|
7.39
|
7.56
|
7.64
|
7.69
|
15
|
3.35
|
4.26
|
4.84
|
5.24
|
5.51
|
5.76
|
5.91
|
6.12
|
6.22
|
6.30
|
24
|
5
|
9.75
|
10.90
|
11.66
|
12.17
|
12.50
|
12.84
|
13.08
|
13.24
|
13.33
|
13.42
|
10
|
7.04
|
8.65
|
9.58
|
10.20
|
10.63
|
11.02
|
11.27
|
11.54
|
11.67
|
11.75
|
15
|
5.05
|
6.45
|
7.34
|
7.95
|
8.38
|
8.77
|
9.01
|
9.33
|
9.50
|
9.63
|
28
|
5
|
12.55
|
14.09
|
15.10
|
15.79
|
16.24
|
16.71
|
17.05
|
17.27
|
17.41
|
17.44
|
10
|
9.06
|
11.17
|
12.40
|
13.21
|
13.80
|
14.32
|
14.67
|
15.03
|
15.23
|
15.35
|
15
|
6.50
|
8.33
|
9.50
|
10.30
|
10.87
|
11.40
|
11.72
|
12.16
|
12.39
|
12.56
|
⑦Ⅱ3-2
|
28
|
5
|
3.96
|
4.41
|
4.73
|
4.97
|
5.18
|
5.35
|
5.50
|
5.58
|
5.66
|
5.69
|
32
|
5
|
5.93
|
6.64
|
7.14
|
7.54
|
7.88
|
8.15
|
8.39
|
8.58
|
8.68
|
8.73
|
⑦Ⅱ4-3
|
20
|
5
|
0.91
|
1.19
|
1.39
|
1.54
|
1.67
|
1.78
|
1.86
|
1.95
|
2.02
|
2.08
|
10
|
0.56
|
0.84
|
1.03
|
1.18
|
1.32
|
1.45
|
1.54
|
1.63
|
1.70
|
1.77
|
15
|
0.42
|
0.66
|
0.84
|
0.99
|
1.13
|
1.25
|
1.34
|
1.43
|
1.50
|
1.58
|
20
|
0.33
|
0.54
|
0.71
|
0.85
|
0.98
|
1.09
|
1.18
|
1.27
|
1.34
|
1.41
|
25
|
0.26
|
0.45
|
0.60
|
0.73
|
0.86
|
0.96
|
1.04
|
1.13
|
1.20
|
1.27
|
24
|
5
|
2.35
|
3.08
|
3.61
|
4.01
|
4.41
|
4.69
|
4.92
|
5.11
|
5.26
|
5.41
|
10
|
1.45
|
2.18
|
2.69
|
3.10
|
3.49
|
3.82
|
4.05
|
4.28
|
4.47
|
4.63
|
15
|
1.09
|
1.73
|
2.21
|
2.60
|
2.93
|
3.29
|
3.53
|
3.77
|
3.96
|
4.13
|
20
|
0.86
|
1.42
|
1.86
|
2.23
|
2.55
|
2.89
|
3.12
|
3.36
|
3.55
|
3.72
|
25
|
0.69
|
1.18
|
1.58
|
1.93
|
2.22
|
2.54
|
2.77
|
3.00
|
3.19
|
3.36
|
28
|
5
|
3.55
|
4.83
|
5.70
|
6.31
|
6.74
|
7.15
|
7.49
|
7.87
|
8.12
|
8.36
|
10
|
2.20
|
3.32
|
4.12
|
4.86
|
5.39
|
5.86
|
6.24
|
6.61
|
6.91
|
7.16
|
15
|
1.65
|
2.65
|
3.40
|
4.06
|
4.62
|
5.08
|
5.46
|
5.84
|
6.15
|
6.41
|
20
|
1.31
|
2.18
|
2.87
|
3.45
|
3.95
|
4.47
|
4.84
|
5.22
|
5.52
|
5.79
|
25
|
1.06
|
1.83
|
2.45
|
2.99
|
3.46
|
3.95
|
4.31
|
4.68
|
4.98
|
5.25
|
⑦Ⅳ2
|
20
|
5
|
3.42
|
3.89
|
4.19
|
4.41
|
4.57
|
4.70
|
4.78
|
4.84
|
4.89
|
4.94
|
10
|
2.39
|
3.02
|
3.38
|
3.63
|
3.81
|
3.96
|
4.05
|
4.16
|
4.24
|
4.30
|
15
|
1.76
|
2.32
|
2.66
|
2.90
|
3.08
|
3.23
|
3.32
|
3.44
|
3.52
|
3.57
|
24
|
5
|
6.20
|
7.09
|
7.64
|
8.05
|
8.35
|
8.61
|
8.77
|
8.89
|
8.99
|
9.09
|
10
|
4.33
|
5.49
|
6.17
|
6.63
|
6.97
|
7.26
|
7.43
|
7.64
|
7.80
|
7.90
|
15
|
3.19
|
4.21
|
4.84
|
5.29
|
5.62
|
5.92
|
6.09
|
6.31
|
6.46
|
6.57
|
28
|
5
|
8.46
|
9.69
|
10.45
|
11.03
|
11.46
|
11.83
|
12.05
|
12.24
|
12.39
|
12.53
|
10
|
5.92
|
7.52
|
8.46
|
9.10
|
9.57
|
9.97
|
10.22
|
10.51
|
10.74
|
10.89
|
15
|
4.36
|
5.77
|
6.65
|
7.28
|
7.75
|
8.16
|
8.40
|
8.70
|
8.92
|
9.09
|
⑦Ⅳ3
|
24
|
5
|
2.25
|
2.91
|
3.40
|
3.77
|
4.05
|
4.31
|
4.51
|
4.72
|
4.87
|
5.01
|
10
|
1.35
|
2.04
|
2.54
|
2.91
|
3.21
|
3.51
|
3.72
|
3.94
|
4.12
|
4.27
|
15
|
1.01
|
1.61
|
2.07
|
2.44
|
2.73
|
3.02
|
3.24
|
3.46
|
3.65
|
3.80
|
20
|
0.79
|
1.32
|
1.74
|
2.08
|
2.36
|
2.64
|
2.86
|
3.08
|
3.26
|
3.42
|
25
|
0.63
|
1.09
|
1.47
|
1.79
|
2.05
|
2.32
|
2.53
|
2.74
|
2.92
|
3.08
|
28
|
5
|
3.47
|
4.52
|
5.29
|
5.90
|
6.35
|
6.76
|
7.09
|
7.44
|
7.68
|
7.91
|
10
|
2.10
|
3.18
|
3.97
|
4.58
|
5.11
|
5.53
|
5.88
|
6.20
|
6.52
|
6.76
|
15
|
1.57
|
2.52
|
3.26
|
3.84
|
4.36
|
4.78
|
5.14
|
5.50
|
5.78
|
6.04
|
20
|
1.24
|
2.07
|
2.74
|
3.29
|
3.78
|
4.19
|
4.55
|
4.91
|
5.20
|
5.45
|
25
|
1.00
|
1.69
|
2.32
|
2.84
|
3.32
|
3.70
|
4.04
|
4.39
|
4.68
|
4.94
|
Table 18 Drawdown of 3H under different area, depth and diaphragm wall depth for layer ⑨
Partition
|
Foundation pit depth(m)
|
Insert depth of diaphragm wall (m)
|
Foundation pit area (m2)
|
1000
|
2000
|
3000
|
4000
|
5000
|
6000
|
7000
|
8000
|
9000
|
10000
|
⑨Ⅱ1-2
|
32
|
5
|
2.47
|
2.77
|
2.94
|
3.05
|
3.13
|
3.21
|
3.25
|
3.30
|
3.33
|
3.36
|
36
|
5
|
5.93
|
6.67
|
7.09
|
7.37
|
7.57
|
7.76
|
7.89
|
8.02
|
8.12
|
8.17
|
⑨Ⅱ3-2
|
32
|
5
|
1.63
|
1.88
|
2.01
|
2.11
|
2.18
|
2.23
|
2.28
|
2.32
|
2.35
|
2.40
|
36
|
5
|
5.08
|
5.86
|
6.27
|
6.57
|
6.78
|
6.95
|
7.10
|
7.24
|
7.33
|
|
Table 19 Site stratigraphic characteristic of Qilianshan South Road Station of Subway 11 Shanghai
Soil sequence number
|
Soil property
|
Floor elevation
(average)(m)
|
Water content%
|
Gravity
KN/m3
|
Strength parameter
|
Indoor permeability test
|
Cohesion c(kPa)
|
Internal friction angle phi friction angle
|
KV
(cm/s)
|
KH
(cm/s)
|
②1
|
Sandy silt with silty clay
|
0.59
|
31.3
|
18.5
|
4
|
30.5
|
7.18×10-5
|
1.29×10-4
|
②3-1
|
Sandy silt
|
-5.88
|
31.1
|
18.3
|
3
|
33.5
|
2.01×10-4
|
4.40×10-4
|
④
|
muddy clay
|
-9.81
|
48.3
|
16.8
|
14
|
11.5
|
2.17×10-7
|
6.95×10-7
|
⑤1-1
|
clay
|
-17.91
|
39.8
|
17.5
|
16
|
13.0
|
8.36E-08
|
1.16×10-7
|
⑤1-2
|
Silty clay
|
-23.71
|
34.7
|
17.9
|
16
|
18.0
|
5.74×10-7
|
1.04×10-6
|
⑥
|
Silty clay
|
-26.73
|
24.2
|
19.4
|
47
|
16.0
|
1.02×10-7
|
1.07×10-7
|
⑦1
|
Silty sand
|
-30.82
|
29.3
|
18.4
|
0
|
32.5
|
3.19×10-4
|
6.05×10-4
|
⑦2
|
Fine sand
|
-37.68
|
27.0
|
18.9
|
0
|
32.5
|
3.34×10-4
|
6.24×10-4
|
⑧1
|
Silty clay with silty sand
|
-46.03
|
32.7
|
18.4
|
20
|
19.5
|
2.77×10-6
|
5.43×10-6
|
⑧2
|
Silty Clay-silt interbedding
|
-63.70
|
32.5
|
18.3
|
21
|
22.0
|
1.45×10-6
|
3.32×10-6
|
Table 20 Comparing calculation and observation subsidence
Observation section
|
Monitored 3H subsidence (mm)
|
Calculation 3H subsidence (mm)
|
North side
|
7.00
|
7.24
|
East side
|
5.00
|
6.58
|