Research on Horizontal Coefficient of Consolidation of Vietnam’s Soft Soil
Table 2
The consolidation properties of soft soil at different sites in Vietnam.
The coefficient of consolidation
Consolidation pressure, σ (kPa)
The vertical coefficient of consolidation
The horizontal coefficient of consolidation
Ratio of ch/
Average
Max
Min
Average
Max
Min
Average
Max
Min
, (m2/year)
ch, (m2/year)
Soft clay—Tien Giang (Site 2). Soluble salt content of 0.20∼0.97%; organic matter content of 3.50∼7.20%. Number of samples = 10
The coefficient of consolidation at σ (m2/year)
0–12.5
4.68
12.71
1.75
9.98
15.88
6.10
2.60
5.03
1.25
12.5–25
2.57
7.09
1.37
6.56
10.44
5.30
2.94
4.44
1.47
25–50
1.65
2.99
0.77
5.16
7.85
2.20
3.44
5.79
1.98
50–100
1.16
1.59
0.68
3.22
4.04
2.22
2.84
3.61
1.83
100–200
1.04
1.43
0.77
2.72
3.59
2.00
2.72
3.73
1.64
200–400
0.96
1.32
0.66
2.81
3.28
2.04
3.05
4.05
2.06
Soft clay—Tra Vinh (Site 3). Soluble salt content of 0.10∼0.25%; organic matter content of 0.91∼3.35%. Number of samples = 15
The coefficient of consolidation at σ (m2/year)
0–12.5
2.75
7.22
0.85
7.63
14.54
2.59
3.79
7.65
1.83
12.5–25
1.80
3.56
0.66
4.64
7.66
1.77
3.00
7.11
1.21
25–50
1.87
3.53
0.88
4.86
9.97
1.86
2.89
7.59
1.42
50–100
1.85
3.66
0.98
5.54
12.55
2.55
3.27
8.29
1.62
100–200
1.65
3.15
0.95
5.62
10.76
1.89
3.84
10.00
1.62
200–400
1.89
4.07
0.91
5.69
10.09
1.58
3.64
10.59
1.47
Soft clay—Soc Trang (Site 4). Soluble salt content of 0.21∼1.95%; organic matter content of 0.60∼5.89%. Number of samples = 26
The coefficient of consolidation at σ (m2/year)
0–12.5
3.19
7.92
1.00
13.26
30.48
7.59
4.91
9.80
2.23
12.5–25
2.33
6.36
0.94
6.07
11.48
1.74
2.95
5.76
1.27
25–50
1.86
4.31
0.86
5.39
13.46
1.27
2.91
6.55
1.14
50–100
1.56
3.06
0.88
5.40
9.41
3.17
3.57
6.49
2.16
100–200
1.44
2.90
0.77
5.24
7.73
2.93
3.94
6.01
1.91
200–400
1.37
2.64
0.59
4.64
7.59
2.46
3.75
6.09
1.35
Soft clay—Ca Mau (Site 6). Soluble salt content of 1.46∼2.32%; organic matter content of 1.60∼8.00%. Number of samples = 19
The coefficient of consolidation at σ (m2/year)
0–12.5
3.61
10.20
1.45
12.37
18.51
3.27
4.15
8.78
1.13
12.5–25
2.08
4.15
1.01
6.21
15.90
2.76
3.03
4.80
1.11
25–50
1.57
2.76
0.72
5.35
9.79
3.47
3.65
6.73
1.42
50–100
1.09
2.51
0.72
4.09
5.98
2.74
3.83
5.01
2.02
100–200
0.89
1.64
0.64
3.46
4.89
2.37
3.99
5.98
2.51
200–400
0.90
1.59
0.67
3.32
4.25
2.54
3.80
4.92
2.03
Soft clay with organic matter—Kien Giang (Site 7). Soluble salt content of 1.42∼2.48%; organic matter content of 11.5∼30.0%. Number of samples = 13
The coefficient of consolidation at σ (m2/year)
0–12.5
2.01
3.27
0.74
14.32
21.79
6.85
7.96
9.26
6.66
12.5–25
1.28
1.93
0.62
11.53
16.50
6.57
9.53
10.52
8.55
25–50
0.83
1.12
0.54
7.26
9.79
4.74
8.81
8.85
8.77
50–100
0.65
0.79
0.52
3.14
3.19
3.08
5.01
5.96
4.06
100–200
0.48
0.60
0.37
1.92
2.56
1.28
3.86
4.27
3.44
200–400
0.52
0.53
0.50
2.14
2.97
1.31
4.17
5.89
2.46
Soft sandy clay—Ha Tinh (Site 1). Soluble salt content of 0.24∼0.82%; organic matter content of 0.78∼4.75%. Number of samples = 6
The coefficient of consolidation at σ (m2/year)
0–12.5
5.75
8.47
2.97
11.66
30.49
9.40
3.29
3.93
2.80
12.5–25
5.17
7.49
2.86
9.72
21.03
5.89
2.38
3.24
1.73
25–50
4.92
7.72
2.82
6.89
14.07
4.65
1.92
2.32
1.65
50–100
4.22
6.12
2.64
4.86
17.90
3.56
2.38
3.12
1.35
100–200
3.78
5.76
1.79
3.99
15.65
3.66
2.54
3.05
2.05
200–400
3.68
6.15
1.14
3.09
14.32
3.09
2.63
3.12
2.07
Soft sandy clay with sand and organic matter—Soc Trang (Site 5). Soluble salt content of 0.75∼1.79%; organic matter content of 0.92%∼5.31%. Number of samples = 8
