Study on Strength Attenuation Characteristics of Residual Expansive Soil under Wetting-Drying Cycles and Low Stress and Its Relationship with Shallow Landslide

Table 1

Characteristic Indexes of Residual Expansive Soil.

Expansive soil	Bulk density [g/cm^3]	Liquid limit	Plastic limit	Plasticity index	Particle composition [%]				Montmorillonite content [%]	Free expansion rate; [%]	Properties of water-soaked disintegrated material of dry rock mass
		[%]	[%]		>0.075 mm	0.075–0.005 mm	<0.005 mm	<0.002 mm
Nanning expansive; Soil	2.075	46.04	23.77	22.27	0.30	56.14	43.56	42.29	11.78	62	“Slice” muddy
Baise; Expansive soil	2.092	56.26	21.37	34.89	0.10	52.02	47.88	45.20	16.58	82	“Clastic” muddy
Shangsi; Expansive soil	2.032	55.33	25.19	30.14	0.09	47.87	52.04	48.6	15.05	51	“Debris” muddy