Impact of In Situ Soil in Soil-Bentonite Cutoff Wall Backfill on Compressibility and Hydraulic Conductivity

Table 1

Properties of constituted soils.

Property	Standard	Constituent soil
		Sand	Nanjing clay	Ca-bentonite
Fines fraction, FF	ASTM [11]	0	72.5	100
Clay fraction, CF	ASTM [11]	0	17	49
Specific gravity, Gs	ASTM [12]	2.65	2.74	2.63
Liquid limit, (%)	ASTM [13]	—	34.5	269.4
Plastic limit, (%)	ASTM [13]	—	20.4	34.0
Classification	ASTM [14]	SP	CL	CH
Swell index, SI (mL/2 g)	ASTM [15]	—	2.2	16.5
Primary clay mineral	^1	—	Illite (53%)	^2Mont. (82%)

¹X-ray diffraction analysis. ²Mont., montmorillonite.