Study on Hygroscopic Swelling and Dehumidification Cracking Characteristics of Expansive Soil under Acid Rain and Cyclic Drying-Wetting

Table 1

Characteristic index of expansive soil.

Soil name	Proportion (Gs)	Natural moisture content	Liquid limit	Plastic limit	Plasticity index	Particle composition/%			Montmorillonite content (%)	Free expansion rate δef (%)
		(%)	(%)	(%)	IP	>0.075 mm	[0.005, 0.075] mm	<0.005 mm
Baise expansive soil	2.7	20.6	56.26	21.37	34.89	0.10	52.02	47.88	16.58	82