Hazards and Treatment of Collapsible Loess Foundation on Ultrahigh Voltage Transmission Lines

Table 1

Physical and mineralogical characterisation of the tested loess.

Property	Value at 2 m	Value at 4 m
Specific gravity	2.68	2.70
Natural water content w (%)	11.2	10.8
Natural density (g/cm^3)	1.50	1.45
Void ratio	0.99	1.05
Atterberg limits
Liquid limit (%)	27.22	28.87
Plastic limit (%)	17.08	18.51
Plasticity index (%)	10.13	10.36
Particle size distribution (%)
Sand >0.075 mm	27	37
Silt 0.075–0.005 mm	64	55.5
Clay <0.005 mm	7	7.5
Permeability characteristics
Horizontal permeability coefficient (10^−5 cm/s)	1.0	13.2
Vertical permeability coefficient (10^−5 cm/s)	3.0	9.3
Collapsibility characteristics
Coefficient of collapsibility	0.027	0.032
Coefficient of self-weight collapsibility	0.008	0.023