Research on Horizontal Coefficient of Consolidation of Vietnam’s Soft Soil

Table 1

The consolidation properties of soft soil at Site 4 determined by two methods.

No	Depth H (m)	Effective stress σ′ (kPa)	CPTu dissipation test				Horizontal coefficient of consolidation—Rowe test ch	Vertical coefficient of consolidation	Ratio of ch/
			Max water pore pressure ui (kPa)	Initial water pore pressure u0 (kPa)	T50 (s)	Horizontal coefficient of consolidation ch			CPTu	Rowe test
						m^2/year
CPTu-01	6	38.4	181	30	3156	3.09	4.70	1.65	1.87	2.85
	10	64.0	318	70	946	10.32	7.03	1.57	6.57	4.48
	14	89.6	364	110	795	12.28	6.21	2.47	4.97	2.51
CPTu-02	5	32.0	98	20	5011	1.95	4.95	1.15	1.70	4.30
	9	57.6	245	60	2296	4.25	3.36	1.13	3.76	2.97
	13	83.2	326	100	1216	8.03	8.35	1.96	4.10	4.26
CPTu-03	6	38.4	150	50	3985	2.45	3.88	1.34	1.83	2.90
	9	57.6	153	80	795	12.28	11.51	3.06	4.01	3.76
	12	76.8	190	110	855	11.42	7.30	2.18	5.24	3.35
CPTu-04	4	25.6	132	30	4875	2.00	1.39	1.00	2.00	1.39
	8	51.2	287	70	1845	5.29	5.00	2.01	2.63	2.49
	12	76.8	347	110	975	10.01	9.41	2.24	4.47	4.20
Average						6.95	6.09	1.81	3.83	3.36