Consolidation Calculator

Calculate settlement and time using Terzaghi one-dimensional consolidation theory — free geotechnical engineering tool

Double DrainageSingle Drainage

S = H · Cc/(1+e0) · log((p0+Δp)/p0)

Tv = Cv · t / Hd²

Hd = H/2 (double drainage)

Input Parameters

Layer Thickness H (m)

Compression Index Cc

Initial Void Ratio e0

Initial Effective Stress p0 (kN/m²)

Stress Increment Δp (kN/m²)

Coefficient of Consolidation Cv (cm²/day)

Final Settlement

Final Settlement S

143.8 mm

(0.1438 m)

Drainage Path Hd

2.50 m

Consolidation vs Time

Degree U (%)	Tv	Time t (days)	Settlement (mm)
10	0.0079	4.9	14.4
20	0.0314	19.6	28.8
30	0.0707	44.2	43.1
40	0.1257	78.5	57.5
50	0.1963	122.7	71.9
60	0.2863	178.9	86.3
70	0.4029	251.8	100.6
80	0.5672	354.5	115.0
90	0.8481	530.1	129.4
95	1.1290	705.6	136.6
99	1.7813	1113.3	142.3

Settlement Progress

10%

14.4 mm

20%

28.8 mm

30%

43.1 mm

40%

57.5 mm

50%

71.9 mm

60%

86.3 mm

70%

100.6 mm

80%

115.0 mm

90%

129.4 mm

95%

136.6 mm

99%

142.3 mm